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House extensions
Single-storey rear, side-return and wraparound extensions, with rooflights, steelwork and glazing.
- Typical range
- £92,000 to £123,00024 m², standard finish, inc. fees and VAT
- Recent work
- Rear, side-return and wraparound
For homeowners
Extensions and refurbishments for London homes
Rear and side-return extensions, kitchens, bathrooms, joinery and whole-house refurbishment, priced after a site visit and built to the drawings.
Studio photograph
A London house is rarely one job. An extension brings a new kitchen, a new kitchen means rewiring, and lifting a bathroom floor exposes old pipework. We put all of it into one itemised schedule and one week-by-week programme, so you see the whole of the work, and the whole of the price, before anything is built.
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Structure, services and finishes priced line by line
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Architect, engineer, Building Control and party wall fees shown separately
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A visible 10% contingency
Services
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Kitchens
Strip-out and refit, custom cabinetry, integrated appliances, electrics and plumbing moved where the layout needs it.
- Typical range
- £19,000 to £33,00016 m², standard finish, inc. VAT
- Recent work
- White City Residence, W12
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Bathrooms and shower rooms
Full strip-out, waterproofing, tiling, sanitaryware and heated towel rails, supplied and fitted.
- Typical range
- £12,000 to £17,000One bathroom, standard finish, inc. VAT
- Recent work
- Gloucester Terrace, W2 · Alacross Road, W5
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Flat and house refurbishment
Layouts changed, services renewed, plastering, joinery and decoration, managed as one programme.
- Typical range
- £82,000 to £130,00075 m² flat, standard finish, inc. VAT
- Recent work
- Alacross Road, W5 · Wellington Row, E2
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Bespoke joinery
Wardrobes, media units and staircase restoration, made to measure and spray finished.
- Recent work
- Reviewed on Trustpilot
One schedule for the whole house
Rear extensions, side-returns and refurbishments on London terraces
Our homeowner projects range from Victorian houses to London flats. Whatever the mix of work, it goes into one itemised schedule and one week-by-week programme.
Homes
Recent home projects
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Really professional service, we have ordered bespoke joinery units for my parents house, made with spray painted MDF with routed handles and also soft close drawers internally for the wardrobes. We also ordered a bespoke tv unit. Really great work, we loved it!
★★★★★ Bespoke wardrobes and TV unit Trustpilot, September 2024 -
Very professional company and great communication. Job complete in time. Highly recommended.
★★★★★ Trustpilot, October 2024 -
Mount St Projects did a fantastic job with our property! We love our new doors and are so impressed with their service and communication. Highly Recommended!
★★★★★ New doors Trustpilot, September 2024
Questions
Questions from homeowners
What building work do you do for homeowners in London?
Single-storey rear, side-return and wraparound extensions, kitchens, bathrooms, bespoke joinery, and full flat or house refurbishments, priced as an itemised schedule of works after a site visit.
How much does a house extension cost in London?
Our planner gives £92,000 to £123,000 for a 24 m² extension at a standard finish, including professional fees, a 10% contingency and VAT.
Do you work with my architect?
Yes. We price and build from your architect’s drawings, and show their fee, the structural engineer, Building Control and party wall costs as separate lines.
Are you members of a trade body?
Yes. Mount St Projects Ltd is a member of the Federation of Master Builders, company number 15499277.
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Tell us about the project
Two minutes on our enquiry form, or call us. Drawings help but are not needed.
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We visit and measure
We look at the property, the access, and anything that affects price: structure, services, neighbours, the landlord’s requirements.
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You receive a priced schedule of works
Every line itemised, with provisional sums and exclusions stated, so you can compare it line by line with any other quote.