Free Extension & Renovation Contract Template
An extension and renovation contract sets out the terms for home improvement works including extensions, loft conversions and major renovations. Use our free UK template to protect yourself and your contractor with a clear, comprehensive agreement.
Type of Works: Home Extension.
Description:
Single-storey rear extension measuring approx. 4m × 5m, comprising: reinforced concrete strip foundations (min. 1m deep), 300mm cavity blockwork to DPC with traditional brick and block above, 5.5m CELSA 203×133 UB steel with Catnic lintels, warm flat roof with EPDM membrane (15-year manufacturer's warranty), 3m aluminium bi-fold doors (Origin OB49 or equivalent), two 1.2m × 0.6m rooflights, rewire and CU upgrade to BS 7671:2018+A2:2022, first-fix plumbing and underfloor heating, plastering, two-coat decoration and 600×600 porcelain floor tiling throughout.
The Works shall be carried out in a good and workmanlike manner, with reasonable care and skill, using materials of satisfactory quality and reasonably fit for purpose, in accordance with sections 49, 50 and 51 of the Consumer Rights Act 2015, the Building Regulations 2010 and any conditions attached to planning permissions or approvals granted for the Works.
Estimated Completion: The Contractor shall use reasonable endeavours to achieve practical completion of the Works by 5 September 2026. Pursuant to section 52 of the Consumer Rights Act 2015, where no time is fixed, the service must be performed within a reasonable time.
The Homeowner shall provide the Contractor with unobstructed access to the Property during normal working hours to enable the Works to proceed without delay. The completion date may be extended by reasonable agreement where delay is caused by variations, unforeseen ground conditions, exceptionally adverse weather, or any other matter beyond the Contractor's reasonable control.
VAT: VAT shall be chargeable in addition at the standard rate of 20% (Value Added Tax Act 1994 s.2).
Payment Schedule:
Deposit 10% (4,850 GBP) on signing (backed by FMB deposit insurance);
Stage 1 — foundations complete and DPC in 20% (9,700 GBP);
Stage 2 — walls at plate height 20% (9,700 GBP);
Stage 3 — roof watertight 20% (9,700 GBP);
Stage 4 — first fix complete 15% (7,275 GBP);
Final — practical completion 15% (7,275 GBP) less snagging retention 1,500 GBP, released 12 months after PC.
Invoicing and payment terms: Each invoice shall be payable within 14 days of receipt. The Contractor shall not suspend the Works for non-payment without first giving the Homeowner seven days' written notice and an opportunity to remedy the default.
Pre-contract information: Any pre-contract information provided to the Homeowner under regulations 9-13 of the Consumer Contracts Regulations 2013 (including the main characteristics of the Works, total price, arrangements for payment and performance, and cancellation rights) forms part of this Contract and may not be varied without the Homeowner's express agreement (CRA 2015 s.50).
(a) public liability insurance with a limit of indemnity of not less than 5,000,000 GBP per occurrence (with the aggregate unlimited);
(b) employers' liability insurance in accordance with the Employers' Liability (Compulsory Insurance) Act 1969, with a minimum limit of 5,000,000 GBP;
(c) where the Contractor has design responsibility for any element of the Works, professional indemnity insurance of not less than 500,000 GBP per claim, maintained for six years from practical completion.
The Contractor shall produce certified evidence of cover on request. The Contractor shall comply with all applicable health-and-safety legislation including CDM 2015 where applicable, and shall ensure that the Property (including the Homeowner's possessions and any occupied parts) is adequately protected during the Works.
Nothing in this clause limits the Homeowner's rights under the Consumer Rights Act 2015 (right to repeat performance, price reduction), the Defective Premises Act 1972 s.1 (habitability, 15/30-year limitation under BSA 2022) or the Limitation Act 1980.
Practical Completion: On completion of the Works, the Contractor shall issue a practical completion notice. Issuance confirms that the Works have been substantially completed in accordance with this Contract, subject only to minor snagging items to be made good within a reasonable time.
What Is an Extension and Renovation Contract?
An extension and renovation contract is a written agreement between a homeowner and a contractor for carrying out significant building works to an existing property. It covers the scope of works, price, programme, quality standards and how the project will be managed from start to completion.
Home extensions, loft conversions, kitchen and bathroom renovations and garage conversions are among the most common domestic building projects in England and Wales. A proper contract protects both parties by clearly defining expectations, payment arrangements and remedies if things go wrong.
For domestic clients in the United Kingdom, the Construction (Design and Management) Regulations 2015 require that health and safety is properly managed. UK planning permission and Building Regulations approval may also be needed depending on the type and scale of the works.
What's Covered in This Template
Our extension and renovation contract template addresses all key aspects of a domestic building project.
Homeowner and Contractor Details
Full names, addresses and contact details of both parties to the contract.
Property Address
The address of the property where the works will be carried out.
Scope of Works
Detailed description of the building works, referencing plans, drawings and specifications.
Planning and Building Regulations
Responsibilities for obtaining planning permission, Building Regulations approval and party wall consents.
Contract Price and Variations
The agreed price, what is included and excluded, and the process for pricing and agreeing variations.
Payment Schedule
Stage payments linked to milestones such as foundations, walls, roof and completion.
Start and Completion Dates
The agreed programme with provisions for delays, extensions of time and liquidated damages if applicable.
Quality and Materials
Standards for workmanship and materials, including any specific products or finishes specified by the homeowner.
Site Access and Working Hours
Arrangements for site access, working hours, parking, welfare facilities and consideration for neighbours.
Defects and Aftercare
Defects liability period, snagging process and the contractor’s obligations to rectify any problems after completion.
How to Create an Extension and Renovation Contract
Follow these steps to set up your home building project on a solid contractual foundation.
- 1
Define the Project
Describe the works in detail, referencing architectural drawings, specifications and any approved planning documents.
- 2
Agree the Price
Confirm whether the contract is fixed price or based on a schedule of rates. Include a clear list of what is included and what is excluded from the price.
- 3
Set the Payment Schedule
Link payments to specific milestones or stages of the work. Never pay a large proportion upfront. Retention of 5% until defects are rectified is standard practice.
- 4
Confirm Compliance Responsibilities
Specify who is responsible for obtaining planning permission, Building Regulations approval and any party wall agreements.
- 5
Sign and Keep Copies
Both parties should sign two copies of the contract. Keep your copy safely along with all drawings, specifications and any subsequent variation agreements.
Legal Considerations
Domestic building projects involve several areas of law that homeowners should be aware of.
This template is for informational purposes only and does not constitute legal advice. Consult a qualified solicitor for advice specific to your situation.
Reviewed for England & Wales law
Planning Permission
Many UK home extensions and renovations require planning permission from the local planning authority. Some works fall under permitted development rights and do not need permission in England and Wales, but this depends on the size, location and type of property. Building works carried out without the necessary British planning permission may be subject to enforcement action.
Building Regulations
Almost all building works in the United Kingdom must comply with the Building Regulations 2010. A building control body (either the local authority or an approved inspector) must be notified and will inspect the works at key stages. A completion certificate is issued when the works are satisfactory and is important for British property sales.
Consumer Protection
For contracts between a UK homeowner and a trader, the Consumer Rights Act 2015 applies. Services must be carried out with reasonable care and skill, materials must be of satisfactory quality, and the price must be reasonable if not agreed in advance. Unfair contract terms are not binding on the British consumer.
Party Wall Act 1996
If the works in England and Wales involve building on or near the boundary with a neighbour, the Party Wall etc. Act 1996 may apply. The homeowner must serve notice on affected neighbours before starting work. If a neighbour dissents, a UK party wall surveyor must be appointed to prepare an award.
Frequently Asked Questions
Create Your Extension and Renovation Contract Now
Protect your home improvement project with a professional contract. Fill in the details, preview your document and download it as a PDF in minutes.
Free · Instant PDF · No account required