What Happens After You Hire a Builder?
- 1 day ago
- 16 min read
Choosing a builder is a major milestone in any house renovation, extension or home improvement project.
After weeks or even months of planning, comparing quotations and discussing your requirements, you have finally selected the contractor you want to work with.
But what happens next?
For many homeowners, this is where uncertainty begins.
You may have signed an agreement, accepted a quotation and agreed that work
will go ahead, but you may still be wondering:
When does construction actually start?
What does the builder do first?
Who arranges inspections?
When do materials arrive?
What happens if you want to change something?
How do you know whether the project is progressing properly?
Understanding what happens after you hire a builder can make the entire process easier to manage. It also helps you understand your responsibilities as a homeowner and what you should reasonably expect from your contractor.
Whether you're planning a house extension, kitchen renovation, loft conversion or wider home refurbishment, this guide takes you through the typical journey from hiring your builder to completing the project.
What Happens Immediately After You Hire a Builder?
Hiring the builder does not usually mean construction starts the following morning.
There is normally a preparation period between accepting the quotation and the first day on site.
This stage is important because it gives everyone an opportunity to confirm exactly what is being built, how it will be delivered and who is responsible for each part of the project.
Depending on the project, the immediate steps may include:
Confirming the building contract
Reviewing the final quotation
Confirming the scope of work
Reviewing drawings
Checking structural information
Confirming specifications
Agreeing the construction programme
Ordering materials
Arranging Building Control matters
Dealing with Party Wall requirements where applicable
Planning site access
Organising waste removal
Preparing the property for construction
A well-organised builder should use this period to remove as much uncertainty as possible before physical work begins.
Step 1: Confirm the Building Contract and Scope of Work
Before construction starts, make sure you understand exactly what you have agreed with your builder.
The contract should clearly establish the scope of the project and the responsibilities of both parties.
Depending on the project, this can include:
Description of the works
Drawings and specifications
Construction programme
Materials
Workmanship
Payment arrangements
Variations
Responsibilities for approvals
Insurance
Site arrangements
Completion requirements
Defects or snagging arrangements
The more clearly the project is defined at this stage, the less room there is for misunderstandings later.
A quotation can tell you what the builder intends to charge, but the contract and supporting documents should make it clear what you are actually getting.
Check What Is Included and Excluded
One of the most useful things you can do before work begins is go through the quotation carefully.
Look for anything that could be unclear.
For example:
Are decorating works included?
Is flooring included?
Are kitchen appliances included?
Who supplies sanitaryware?
Is external landscaping included?
Is waste removal included?
Are structural steel requirements included?
Are professional fees separate?
Are specialist installations included?
You don't need to assume that every possible item is included simply because it appears obvious to you.
If something matters to the finished result, make sure it is clearly documented.
This is particularly important for larger renovations and extensions where many different trades and materials are involved.
Step 2: Finalise the Drawings and Specifications
Once the builder has been appointed, the project should move towards a construction-ready level of information.
The builder may need access to:
Architectural drawings
Structural drawings
Construction details
Electrical layouts
Plumbing information
Kitchen plans
Bathroom specifications
Window and door schedules
Material specifications
Not every project requires the same level of documentation.
However, the more complicated the project, the more important detailed information becomes.
A double-storey extension, for example, requires considerably more coordination than a straightforward internal decoration project.
Why Specifications Matter
A drawing might show where a kitchen island is positioned, but it may not define every detail of the finished kitchen.
Specifications help establish the expected quality and appearance of the project.
They may cover:
Flooring
Tiles
Doors
Windows
Ironmongery
Sanitaryware
Kitchen units
Worktops
Lighting
Heating
Decoration
External finishes
If you want a particular product or finish, it is much better to identify it before construction rather than attempting to change it halfway through.
Step 3: Make Sure Necessary Approvals Are in Place
Before work starts, you need to establish whether the project requires planning permission, permitted development procedures, Building Regulations approval or other formal arrangements.
Planning permission and Building Regulations approval are not the same thing.
Building Regulations cover construction standards such as structural stability, fire safety, energy efficiency, ventilation and other technical requirements.
GOV.UK confirms that many extensions and alterations require Building Regulations approval, depending on the work involved.
For most standard residential projects in England, Building Control can be handled through the local authority or a private registered building control approver, depending on the project and route chosen.
Your builder may help coordinate these arrangements, but you should understand who is responsible for each approval.
Never assume that because you have planning permission, every other approval has automatically been dealt with.
Step 4: Deal With Party Wall Requirements
Party Wall matters can become particularly important for London homeowners because many properties are terraced or semi-detached and sit close to neighbouring buildings.
The Party Wall etc. Act 1996 applies in England and Wales and can be relevant where proposed work involves certain work to a party wall, building on or at the boundary, or excavation near a neighbouring property's foundations.
If the Act applies, the required notices need to be dealt with before the relevant work begins.
The government guidance states that notice for work to an existing party wall generally needs to be given at least two months before the planned start date, while certain boundary and excavation situations have different notice periods.
This is an area where homeowners should obtain appropriate professional advice if they are uncertain.
A builder can be involved in the practical process, but don't assume that hiring a contractor automatically resolves your Party Wall responsibilities.
Step 5: Agree the Construction Programme
Your builder should provide a realistic indication of how the project will progress.
The programme may be broken into stages such as:
Site preparation
Demolition
Groundworks
Foundations
Drainage
Structural construction
Roofing
Windows and doors
First fix services
Insulation
Plastering
Second fix
Kitchen and bathroom installation
Flooring
Decorating
External works
Snagging
Completion
The exact sequence will vary according to the project.
A programme isn't a guarantee that every stage will happen on a particular date. Construction involves variables that can affect timing.
However, having a programme gives you a framework for understanding what should happen next.
How Long After Hiring a Builder Does Work Start?
There is no universal waiting period.
The start date can depend on:
Planning permission
Building Regulations
Party Wall matters
Final drawings
Structural calculations
Material availability
Builder availability
Site access
Specialist trades
Previous commitments
Project complexity
A straightforward renovation may be able to move forward relatively quickly once the agreement is signed.
A major extension can require considerably more preparation.
The important thing is to agree on a realistic start date rather than assuming that construction will begin immediately after accepting the quotation.
Step 6: Prepare Your Home for Construction
Before the builder arrives, you may need to prepare the property.
Depending on the project, this could involve:
Removing furniture
Clearing cupboards
Protecting valuables
Moving personal belongings
Emptying rooms
Disconnecting appliances
Arranging temporary kitchen facilities
Protecting areas that aren't being renovated
Making arrangements for pets
Planning alternative access
If you're remaining in the property during construction, discuss the practical arrangements with your builder beforehand.
For a large extension or renovation, living through the work can be very different from living in the finished property.
What Happens on the First Day of Building Work?
The first day is usually about establishing the site rather than immediately reaching a major construction milestone.
The builder may:
Meet the site team
Establish access
Set up protection
Arrange storage
Organise waste
Set up welfare facilities
Mark out areas
Check existing conditions
Begin preparation or demolition
For larger projects, the site may need scaffolding, temporary fencing, skips, material storage and other arrangements.
A professional site setup helps establish a safer and more organised working environment.
Site Access and Deliveries
London projects can present particular logistical challenges.
A property may have:
Narrow access
Limited parking
Terraced neighbours
Restricted delivery areas
Small gardens
Limited storage space
Your builder needs to consider how materials, tools and waste will move through the site.
A good logistics plan can prevent unnecessary disruption.
For example, materials shouldn't simply arrive without considering where they will be safely stored.
Likewise, waste should be removed regularly rather than allowed to interfere with the working area.
Step 7: Demolition and Initial Preparation
If the project involves removing walls, floors, kitchen units or existing structures, demolition may come before the main construction work.
This stage can reveal conditions that weren't visible during the design process.
For example, the builder may discover:
Unexpected pipework
Hidden electrical cables
Poor previous alterations
Structural issues
Damp
Unexpected drainage
Different construction details
Existing materials that require specialist treatment
Not every project will uncover surprises, but older properties can contain elements that are difficult to assess fully before opening up the building.
If something unexpected is discovered, don't panic.
Ask the builder to explain:
What has been found?
Why does it matter?
What needs to be done?
Will it affect the programme?
Will it change the agreed scope?
Does it require additional approval or design work?
Clear communication is especially important at this stage.
Step 8: Groundworks and Foundations
For an extension, groundworks are often among the earliest major construction stages.
This may involve:
Excavation
Foundation preparation
Drainage
Concrete
Ground beams where required
Sub-floor construction
Damp-proofing
The exact foundation design should be determined by the property's structural requirements and site conditions.
Ground conditions can vary significantly, particularly around existing trees, drainage routes and previous structures.
This is one reason why an extension should not be treated as simply "adding a room to the back of the house".
The new structure must work safely with the existing building.
Step 9: Structural Construction
Once the foundations and below-ground works are sufficiently advanced, the new structure can begin to take shape.
Depending on the design, this can include:
Brickwork
Blockwork
Structural steel
Timber framing
Floor structures
External walls
Internal structural walls
If the extension involves creating a large opening between the existing house and new space, structural steelwork may be required.
This stage can be exciting for homeowners because the outline of the new space becomes much easier to understand.
Step 10: Roofing, Windows and Doors
Once the main structure is established, the project begins to become weather-tight.
The roof structure and covering are installed, followed by windows and external doors according to the design.
This stage is important because it protects the interior from the weather and allows subsequent internal work to progress more efficiently.
For extension projects with large areas of glazing, this is also when the relationship between the interior and garden starts becoming clear.
Step 11: First-Fix Services
The first fix is the stage where many essential services are installed before walls and ceilings are fully finished.
This can include:
Electrical cabling
Plumbing
Heating pipework
Ventilation
Data cabling
Lighting preparation
The exact services depend on the project.
For example, a new kitchen extension may require significant electrical and plumbing coordination.
A home office may require additional data points and power outlets.
Thinking about these requirements before construction begins is much easier than trying to add them after walls have been finished.
Step 12: Insulation and Internal Finishes
Once the main structure and services are progressing, the project can move towards internal finishes.
This may involve:
Insulation
Plasterboarding
Plastering
Screeding
Internal doors
Skirting
Architraves
At this point, the building starts to feel much more like a finished home.
The spaces become easier to understand, and you can begin to see how the final layout will work.
Step 13: Second-Fix Work
The second fix generally involves installing visible components and completing systems that were prepared during the first fix.
This can include:
Sockets
Switches
Light fittings
Radiators
Sanitaryware
Taps
Internal doors
Ironmongery
Kitchen components
The exact sequence will depend on the project.
Careful coordination is important because several trades may need to work in the same area.
Step 14: Kitchen and Bathroom Installation
For many homeowners, this is one of the most anticipated stages.
A new kitchen or bathroom involves multiple trades and products working together.
A kitchen may involve:
Units
Worktops
Appliances
Plumbing
Electrical connections
Lighting
Splashbacks
Flooring
A bathroom may involve:
Sanitaryware
Shower systems
Tiling
Waterproofing
Plumbing
Ventilation
Lighting
Delays can occur if products haven't been ordered early enough.
This is why material selection and procurement should ideally happen well before the installation date.
What Happens If You Want to Change Something?
Changes during construction are common, but they need to be handled carefully.
You may suddenly decide that:
You want another rooflight
A socket should move
You prefer a different floor
You want an additional cupboard
A door should be repositioned
You want to change a finish
Some changes may be relatively simple.
Others can affect several trades or require structural or technical revisions.
For example, moving a socket before plastering may be straightforward.
Moving a structural wall after construction has started is an entirely different matter.
Understand Variations
A variation is essentially a change to the agreed scope of work.
Whenever you request a significant change, make sure you understand:
What is changing
Why it is changing
Whether there is an additional cost
Whether it affects the programme
Whether drawings need updating
Whether approval is required
Ideally, significant variations should be agreed and recorded before the work is carried out.
This helps prevent disputes later.
What Happens If the Project Is Delayed?
Construction projects don't always progress exactly according to the original programme.
Delays can arise from:
Material shortages
Design changes
Unexpected site conditions
Weather
Specialist trades
Approval issues
Client decisions
Structural discoveries
Delivery problems
The important thing is understanding why the delay has occurred.
A short delay caused by an unexpected structural issue is very different from repeated delays caused by poor organisation.
If the programme changes, ask the builder:
What caused the delay?
How long is the impact expected to be?
Which part of the programme is affected?
What is being done to recover time?
Does anything need to be changed?
Good communication can prevent a relatively small delay from becoming a major source of frustration.
What Should You Expect From Your Builder?
Once construction begins, your builder should provide an appropriate level of project management and communication for the scale of the work.
You should generally expect:
Clear Communication
You should know what is happening and what decisions are required from you.
Site Management
The site should be organised and managed appropriately.
Trade Coordination
Different trades need to be scheduled in the correct sequence.
Material Management
Materials need to arrive when required and be stored appropriately.
Quality Control
Work should be checked as construction progresses rather than waiting until the end to identify every issue.
Problem Solving
Unexpected problems should be discussed rather than hidden.
Programme Management
The builder should monitor progress and communicate significant changes.
What Are You Responsible for as the Homeowner?
The builder manages construction, but homeowners also have responsibilities.
You may need to:
Make decisions promptly
Approve materials
Confirm finishes
Provide access
Keep communication channels open
Review proposed changes
Raise concerns early
Avoid unnecessary last-minute changes
Keep important project documents
Make agreed payments according to the contract
If the builder needs a decision about flooring, tiles, doors or lighting and you take several weeks to decide, the project may be affected.
Good homeowner involvement doesn't mean managing the trades yourself.
It means making informed decisions at the right time.
How Should You Monitor Construction Progress?
You don't need to become a construction professional to keep track of your project.
A simple system can be enough.
Regularly discuss:
What has been completed
What is happening next
Which decisions are needed
Whether materials have arrived
Whether inspections are scheduled
Whether the programme has changed
Whether variations have been proposed
For larger projects, regular site meetings can be useful. Keep important decisions in writing so there is a clear record of what was agreed.
How Do Building Control Inspections Fit Into the Process?
Building Control is separate from the builder.
Its role is to assess whether applicable building work complies with Building Regulations.
The inspection stages depend on the project and the building control route being used.
Your builder may coordinate access for inspections, but make sure you know:
Who has submitted the application
Which building control body is involved
What inspections are expected
Who will arrange them
What documentation will be provided at completion
GOV.UK states that Building Regulations approval is separate from planning permission and that the applicable building control body depends on the type of project.
For a normal residential extension, these arrangements should be understood before construction begins rather than left until the end.
What Happens Near the End of Construction?
As the project approaches completion, the focus shifts from construction to finishing and checking.
Typical final-stage work can include:
Final joinery
Decorating
Flooring
Kitchen completion
Bathroom completion
Light fittings
External works
Landscaping
Cleaning
Testing
Final adjustments
This is often when small imperfections become more noticeable. That doesn't necessarily mean something has gone wrong.
Every construction project can have minor items that need attention before completion. This is where snagging becomes important.
What Is a Snagging List?
A snagging list is a record of unfinished work, defects or items that need correcting.
Examples could include:
A door that doesn't close properly
Minor paint imperfections
Loose handles
A poorly adjusted window
Small gaps in finishes
Incomplete sealant
Scratches
Damaged fittings
Missing trim
Minor finishing issues
The list should be practical and specific.
Instead of writing:
“The bathroom is not finished properly.”
identify the actual issue:
“Sealant missing along the edge of the bath on the left-hand side.”
This makes it much easier for the contractor to understand what needs to be addressed.
Don't Leave Snagging Until Months Later
The best time to identify outstanding items is while the project team is still engaged with the work.
Walk through each area systematically.
Check:
Walls
Ceilings
Floors
Doors
Windows
Cabinets
Sanitaryware
Electrical fittings
Lighting
Heating
External areas
Keep a written record and photographs where useful.
What Happens When the Project Is Complete?
Once the main work is finished and snagging has been addressed, the project moves towards formal completion.
Depending on the project, you may receive documentation such as:
Electrical certificates
Gas-related certification where applicable
Product warranties
Appliance information
Manufacturer manuals
Maintenance information
The exact documentation depends on the work carried out.
Keep these records safely.
They can be useful for future maintenance and may be important when selling the property.
GOV.UK notes that missing Building Regulations approval can create problems obtaining certificates of compliance that may be needed when selling a home.
What About Your Neighbours?
If your project affects a party wall or neighbouring property, communication shouldn't stop once construction begins.
Where Party Wall procedures apply, the building owner must comply with the relevant requirements, including taking reasonable care to avoid unnecessary inconvenience and addressing damage caused by the works.
This is particularly important for London properties where neighbouring homes can be very close to the construction site.
Being considerate about:
Working hours
Noise
Deliveries
Access
Dust
Waste
Shared boundaries
can make the construction period considerably easier for everyone.
What Should You Do If Something Goes Wrong?
Even well-managed projects can encounter problems. If you're concerned about something, raise it early. Don't wait until the entire room has been finished.
For example, if you believe a door is in the wrong position, discuss it while the relevant work is still accessible.
If you think a material isn't what was agreed, raise it before installation. If you notice water entering an area during construction, report it immediately.
Early communication gives the builder a better opportunity to investigate and resolve the issue.
Common Mistakes Homeowners Make After Hiring a Builder
1. Assuming Everything Is Included
Always check the scope.
2. Making Frequent Last-Minute Changes
Changes can affect cost, time and sequencing.
3. Delaying Decisions
Late decisions can hold up trades and materials.
4. Not Keeping Records
Keep copies of important agreements, drawings, specifications and variation approvals.
5. Ignoring Small Problems
A small issue can become harder to fix once additional work covers it.
6. Comparing the Finished Work to an Unagreed Expectation
Judge the work against the agreed drawings, specification and contract rather than an idea that was never documented.
7. Focusing Only on the Final Appearance
A finished room can look excellent, but the technical work behind it matters too.
A Simple Homeowner Timeline
Although every project is different, the overall journey can often be understood like this:
Stage 1 — Builder Appointed
Contract, quotation and scope confirmed.
Stage 2 — Pre-Construction
Drawings, specifications, approvals and procurement finalised.
Stage 3 — Site Setup
Access, protection, storage, waste and welfare arrangements established.
Stage 4 — Preparation
Demolition and initial works carried out where required.
Stage 5 — Structural Work
Foundations, walls, floors, steelwork and roof were constructed.
Stage 6 — Services
Plumbing, electrical, heating, ventilation and other first-fix work installed.
Stage 7 — Internal Finishes
Insulation, plastering, joinery and second-fix work completed.
Stage 8 — Fit-Out
Kitchen, bathrooms, flooring, lighting and other finishes installed.
Stage 9 — Final Works
Decoration, external works, cleaning and adjustments completed.
Stage 10 — Snagging and Completion
Outstanding items addressed and relevant completion documentation gathered.
Frequently Asked Questions
1. What happens after you hire a builder?
After hiring a builder, the project normally moves into the pre-construction stage. The contract, scope, drawings, specifications, programme, approvals, materials and site arrangements are confirmed before physical construction begins.
2. How long after hiring a builder does work start?
There is no standard timeframe. The start date depends on the project's size, approvals, drawings, material availability, builder availability and any Party Wall requirements. A major extension will generally require more preparation than a smaller renovation.
3. What should I check before building work starts?
Check that the scope of work, drawings, specifications, contract, programme and responsibilities are clear. Also confirm any required planning, Building Regulations and Party Wall arrangements before relevant work begins.
4. What should my builder provide during construction?
For an appropriately managed project, you should expect communication about progress, coordination of trades, site management, material procurement and updates about significant issues affecting the programme or agreed scope.
5. Who arranges Building Control inspections?
This depends on the project and the agreed arrangements. A building control body is responsible for the regulatory inspection process, while your builder may coordinate site access and practical arrangements. Make sure you know who is responsible before work begins.
6. What happens if I want to change something during construction?
The change should be discussed with the builder before the work is carried out. Significant changes should be documented, including any effect on the agreed scope, cost and programme.
7. What happens after building work is completed?
The project normally moves through final checks, snagging, testing, cleaning and completion. Relevant certificates, warranties and other project documentation should then be collected and retained.
Final Thoughts:
Hiring a builder is an important milestone, but it is only the beginning of the construction phase.
The period immediately after appointment is about turning the agreed idea into a properly organised project.
Drawings need to be confirmed.
Specifications need to be understood.
Materials need to be ordered.
Approvals need to be addressed.
The site needs to be prepared.
Then the construction itself can begin.
From foundations and structural work through to plumbing, electrics, plastering, kitchens, bathrooms and final finishes, every stage depends on good coordination.
As the homeowner, you don't need to manage every trade or understand every technical detail.
What you do need is a clear understanding of:
what is being built, who is responsible for each part, what decisions you need to make and how progress will be communicated.
The best projects are built on clear expectations.
If something changes, discuss it early.
If something is unclear, ask.
If a problem appears, address it before it becomes bigger.
And when the work is nearing completion, take the time to inspect the finished project carefully rather than rushing towards the final handover.
For London homeowners, this organised approach is particularly valuable. Restricted access, neighbouring properties, older buildings and complex urban sites can introduce additional challenges that need to be considered throughout the construction process.
Whether you're carrying out a house extension, kitchen renovation, loft conversion or complete home refurbishment, understanding what happens after hiring a builder can give you much greater confidence throughout the journey.
Planning Your Next Building Project?
Choosing the right builder is only one part of a successful renovation or extension.
The next step is making sure the project is properly organised from the moment the agreement is signed through to completion.
Nilo Construction helps homeowners approach residential building projects with a focus on careful planning, coordinated construction and practical results. From extensions and renovations to larger home transformations, the process should be clearly managed from the first day on site through to the final snagging check.
If you're preparing to start a building project, make sure you understand not only who will build it, but also how the project will be managed from start to finish.
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