Thoughtful building work for Barnes homes
Prohaus carries out extensions, loft conversions, renovations, kitchens, bathrooms and bespoke joinery in Barnes. From period terraces near the village and compact cottages around Castelnau to larger family homes towards the river, we plan the build around the property, the street and the way you want to live.
Homes and projects in Barnes
Barnes has a strong architectural identity and a mix of homes where proportion, materials and detail matter. Good work should improve everyday space without making the new part feel detached from the original house.
Prohaus serves Barnes Village, Castelnau, Little Chelsea, North Barnes and the riverside streets.
Selected Prohaus work close to Barnes
We do not present work from another neighbourhood as a Barnes project. Until a completed Barnes case study is available, these nearby projects show the type and standard of residential work Prohaus delivers across South West London.
Genuine work, accurately labelled
For a Barnes enquiry, we start with the actual house and brief rather than forcing a standard solution. We look at structure, access, party-wall interfaces, drainage, roof form, natural light and the planning context before the scope and quotation are fixed.
What we build in Barnes
One coordinated plan connects the structure, services, carpentry, glazing, plastering, tiling and finishes. This makes responsibilities clearer and helps the work proceed in the right order.
House extensions
Rear, side-return and wraparound extensions designed around the existing structure, daylight, storage and how the new room will connect to the garden.
Loft conversions
Dormer, rooflight and hip-to-gable options considered against head height, stair position, roof form, neighbouring properties and planning constraints.
Home renovations
Structural alterations, services, insulation, plastering, flooring, decorating and fitted elements coordinated as one practical programme.
New builds
Residential construction delivered from approved information, site preparation and structural work through to finishes and handover.
Kitchens and bathrooms
Standalone or wider-project kitchen and bathroom work, with the building, plumbing, electrical, tiling and finishing stages properly sequenced.
Doors, windows and glass
Aluminium doors and windows, architectural glazing and openings formed to bring in light and improve the connection to outside space.
Bespoke joinery
Made-to-measure wardrobes, alcove units, media walls, benches, shelving and storage for difficult or valuable spaces.
Explore every Prohaus service
View servicesProhaus guide prices
Guide prices reviewed October 2026. Starting figures assume a straightforward project and exclude VAT. Survey findings, design, structure, specification, access and the final scope determine the written quotation.
Planning and conservation in Barnes
Barnes is within the London Borough of Richmond upon Thames. Parts of the area sit within Barnes Green, Castelnau and other conservation areas, where the effect of an extension, roof alteration, window change or external material on the character of the street can carry extra weight. Some properties may also be affected by an Article 4 Direction, so permitted development rights should never be assumed from a generic online checklist.
We can build from your architect’s approved drawings and structural information, or introduce suitable professionals if the project is at an earlier stage. Planning permission and building regulations are separate matters, and party-wall duties may apply even when planning permission is not required.
A clear, evidence-led way to build
Established experience
Prohaus Ltd was registered in 2015, with more than 20 years of construction experience behind the business.
Coordinated delivery
We organise the trades and construction sequence around one agreed scope and programme.
Written quotation and contract
Scope, assumptions and price are recorded so both sides know what has been agreed.
Safe certification wording
Gas and electrical work is carried out by appropriately registered subcontractors, who issue the relevant certification for their work.
From first conversation to handover
Brief
We discuss the property, outcome, budget, timing and design information already available.
Site visit
We review structure, services, access, neighbours and the practical risks visible at this stage.
Scope and quote
A written, itemised quotation is prepared for the agreed work and assumptions.
Construction
Trades, deliveries, quality checks and updates are coordinated through the programme.
Handover
We walk through the completed work, record snagging and provide relevant documents.
Barnes and nearby
We also work in Mortlake, East Sheen, Richmond, Putney and Roehampton.
Questions about building in Barnes
Do you take on extensions in Barnes conservation areas?
Yes. The design and permissions must be checked for the individual property, with particular care around scale, roof form, windows and external materials. We build from the approved information and keep the construction details consistent with it.
Can you renovate a Barnes home without removing its character?
That is normally the aim. Existing features worth retaining are identified early, while new structure, services, insulation, storage and finishes are coordinated around them. The right balance depends on the house and the brief.
Do you work in Mortlake and East Sheen as well as Barnes?
Yes. Prohaus works across Barnes, Mortlake, East Sheen, Richmond and neighbouring parts of South West London.
How much does building work cost in Barnes?
Guide prices start from £60,000 plus VAT for a rear or side extension, £50,000 plus VAT for a loft conversion, £4,500 plus VAT for a kitchen or bathroom, £100,000 plus VAT for a larger renovation or conversion, and £1,200 plus VAT for bespoke joinery. The final quotation depends on the surveyed property, drawings, structure, specification, access and agreed scope.
How long will my project take?
Timing depends on the scope, approvals, structural work, specification, access and whether the property remains occupied. We set out a realistic programme once the design information and scope are clear, rather than promising a generic duration before the project has been assessed.
Who provides gas and electrical certification?
Where gas or notifiable electrical work forms part of the project, it is carried out by appropriately registered subcontractors, who provide the relevant certification for their work.
What contract and guarantee do you provide?
Every project runs under a written, agreed contract. Completed Prohaus work comes with a 1-year guarantee, with the scope and any product-specific warranties recorded in the project documents.
Talk to Prohaus about your Barnes project
Share your address, aims and any drawings you have. We will help identify the next practical step and whether a site visit is appropriate.
