House Extensions & Loft Conversions in West London
Family-run builders in Hayes. One team from drawings and planning to the Building Control certificate – with a written price and a 12-month warranty.
REAR KITCHEN EXTENSION · HAYES UB3
12-month workmanship warranty
Written into every contract
Building Control certified
Completion certificate on every project
Fully insured
Public & employer’s liability
Based in Hayes UB3
Building in West London since 2019
WHAT WE BUILD
Three things we do exceptionally well
Everything else – kitchens, bathrooms, roofing, plastering, decorating – we do as part of these, or on their own. Ask.
House Extensions
Rear, side-return, wrap-around and double-storey extensions on West London’s 1930s semis and Victorian terraces.
From £50,000 · 8–12 weeks
Loft Conversions
Hip-to-gable, rear dormer, L-shaped and Velux lofts – a bedroom and en-suite without losing any garden.
From £35,000 · 6–10 weeks
Refurbishments & Renovations
Whole-house refurbishments, kitchens, bathrooms, garage conversions and structural alterations.
From £15,000 · 3–14 weeks
RECENT WORK
Built across Hillingdon, Ealing, Hounslow & Harrow
COSTS
How much will it cost?
Realistic 2026 ranges for West London, excluding VAT. Use the calculator for a figure for your own project, then book a free survey for a fixed price.
3 M REAR EXTENSION
£50k – £70k
18–22 m² · 8–10 weeks · excludes kitchen
HIP-TO-GABLE LOFT
£58k – £85k
25–35 m² bedroom + en-suite · 8–10 weeks
SIDE-RETURN EXTENSION
£40k – £60k
Victorian terraces · 8–10 weeks
GARAGE CONVERSION
£15k – £25k
Single garage · 3–4 weeks
HOW WE WORK
One team, start to certificate
01
Free site survey
We measure, check drains and planning, and give you an itemised written quote.
02
Drawings & approvals
Plans, structural calculations, planning or prior approval, Party Wall notices.
03
The build
A dedicated site manager, agreed payment stages, the house kept liveable.
04
Sign-off
Building Control completion certificate, snagging, 12-month warranty.
AREAS WE COVER
Local to Hayes, working across West London
Our yard is on Leven Way, UB3. Most of our projects are within 30 minutes of it.
Hayes Hillingdon Uxbridge Ruislip Southall Greenford & Northolt Ealing Acton Hounslow Harrow West Drayton Slough Windsor Maidenhead All areas →
GUIDES
Before you get quotes, read these
House extension cost in West London (2026)
Per-m² rates, price table, hidden costs.
Loft conversion cost in West London (2026)
Velux to mansard, which suits your roof.
How to choose a builder
12 questions, the paperwork, the red flags.
Ready to talk about your project?
Free site visits anywhere in West London. Written quotes within a week.