House Extensions
From £30,000
Pricing
Transparent, Fixed Pricing
No hidden costs. No surprises. Just honest, competitive pricing for quality construction work.
Prices by service
New Builds
From £165,000
Renovations & Refurbishments
From £15,000
Price list
Every service, one table
Starting prices for a straightforward project of typical size, shown against the typical London range. Your fixed price is confirmed in writing after a free site survey.
| Service | Our price from | Typical market range | Typical build time |
|---|---|---|---|
| Rear Extensions | £35,000 | £42,000 – £55,000 | 8–14 weeks |
| Side Return Extensions | £30,000 | £36,000 – £48,000 | On survey |
| Wraparound Extensions | £55,000 | £70,000 – £95,000 | 12–16 weeks |
| Loft Conversions | £40,000 | £48,000 – £65,000 | 6–10 weeks |
| Kitchen Extensions | £35,000 | £42,000 – £55,000 | On survey |
| Garage Conversions | £18,000 | £22,000 – £30,000 | 2–4 weeks |
| New Build Homes | £165,000 | £200,000 – £275,000 | 6–12 months |
| Custom Home Design & Build | £225,000 | £275,000 – £350,000 | 9–15 months |
| Property Development | £325,000 | £400,000 – £500,000 | On survey |
| Full Property Renovations | £65,000 | £80,000 – £110,000 | 10–16 weeks |
| Bathroom Renovations | £8,000 | £10,000 – £15,000 | 2–3 weeks |
| Kitchen Renovations | £15,000 | £18,000 – £28,000 | 3–6 weeks |
| Period & Listed Buildings | £50,000 | £60,000 – £85,000 | On survey |
| Structural Alterations | £15,000 | £18,000 – £28,000 | On survey |
| Basement Conversions | £75,000 | £90,000 – £130,000 | 8–14 weeks |
| Commercial Fit Outs | £40,000 | £48,000 – £65,000 | On survey |
Prices include VAT at 20%. Some renovation projects may qualify for reduced-rate VAT at 5%. We'll advise if this applies to your project.
What affects the price
Why two extensions of the same size can cost differently
Size and layout
Floor area drives most of the cost, along with how many rooms, openings and corners the design has.
Ground and foundations
Clay, trees, drains or sewers nearby can mean deeper or specialist foundations. We check at survey and price it in.
Structure
Knocking through, wide openings and loft floors need steel beams sized by a structural engineer.
Specification
Glazing, roof lanterns, kitchens, bathrooms and flooring vary widely. We price to the finishes you choose.
Access
Terraces with no side access, parking restrictions and working at height all affect labour and plant.
Consents
Planning, Building Control, party wall and water-company fees depend on the project and the council.
How you pay
Stage payments, never up front
You pay a 10% deposit, then in stages as each part of the work is completed and checked. If planning or Building Regulations approval isn't needed, that payment moves to the next stage. 5% is held back until the end of the defects period.
- 01Contract SigningInitial deposit to secure your project slot and begin design work. Upon contract signing.10%
- 02Planning ApprovalDue when planning permission is granted (if required). Typically 8 to 13 weeks after contract.5%
- 03Building Regulations ApprovalDue when Building Regulations approval is received. Typically 4 to 6 weeks after planning.5%
- 04Groundworks CompleteDue when foundations and groundworks are completed. Typically 1 to 2 weeks after construction start.15%
- 05Superstructure CompleteDue when walls, roof structure, and windows are installed. Typically 3 to 5 weeks after construction start.20%
- 06First Fix CompleteDue when electrics, plumbing, and heating first fix is complete. Typically 6 to 8 weeks after construction start.15%
- 07Second Fix CompleteDue when second fix electrics, plumbing, and finishes are complete. Typically 9 to 11 weeks after construction start.10%
- 08Practical CompletionDue when the project is substantially complete and ready for handover. Typically 12 to 16 weeks after construction start.15%
- 09Retention ReleaseFinal retention payment released after 3 month defects liability period. 3 months after practical completion.5%
FAQ
Pricing FAQs
Yes. We provide fixed price quotes based on detailed specifications. The price we quote is the price you pay, unless you request changes to the scope of works.
Yes, all our prices include VAT at 20%. Some renovation projects may qualify for reduced-rate VAT.
Yes. Clients with multiple projects (e.g., developers, landlords) receive preferential pricing. Contact us to discuss your requirements.
We accept bank transfer, cheque, and major credit/debit cards. We never request cash payments.
You may cancel before work commences with no penalty. After work starts, cancellation terms are outlined in the contract.
Our prices are based on the agreed scope of works and normally include labour, materials, project management, and waste removal. Items like architectural drawings, planning support, Building Regulations applications, and specialist consultant fees are included only when they form part of the agreed package.
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