Premium Builders in Barnes
Bespoke extensions, luxury renovations, and premium loft conversions for discerning homeowners in Barnes, SW13.
Builders in Barnes, SW13
Barnes is one of South West London's most enchanting and sought-after villages, where charming period cottages, elegant Victorian and Edwardian houses, and picturesque riverside properties create an atmosphere of refined tranquillity remarkably close to central London. For discerning homeowners in SW13, Alstruct Ltd delivers bespoke construction services meticulously crafted to complement this distinguished village setting.
The property landscape of Barnes is wonderfully diverse, from the characterful cottages surrounding Barnes Green and the duck pond to the premium riverside homes along the Thames towpath. Many of these properties offer exceptional potential for luxury rear extensions, premium loft conversions, and comprehensive renovations that enhance living space while preserving the village character that makes Barnes so uniquely desirable. Served by Barnes station on the Overground, the area attracts families and professionals who value premium craftsmanship and village living.
Alstruct brings specialist knowledge of the London Borough of Richmond upon Thames's planning policies, including the Barnes Green, Castelnau, Barnes Common and Mill Hill conservation areas. Our team ensures every project navigates the planning process with expertise, delivering the premium finishes and exquisite craftsmanship that Barnes homeowners expect.
Why Choose Alstruct in Barnes?
- Specialists in Barnes' period cottages, Victorian houses and riverside properties
- Expert knowledge of Richmond upon Thames planning policies and the Barnes conservation areas
- CHAS Elite, Constructionline Gold & FMB certified backed by third-party audits
- Bespoke architectural design sensitive to Barnes' village character
- Premium materials and meticulously crafted finishes throughout
- Deliveries, parking and working hours planned with the council and neighbours before work starts
- Dedicated project manager from initial consultation to completion
- Published case studies with scope, programme and budget
Premium Construction Services in Barnes
Luxury House Extensions Barnes
Bespoke rear and side extensions enhancing Barnes' period properties with premium contemporary living spaces.
Learn more →Premium Loft Conversions Barnes
Exquisite dormer and mansard loft conversions creating luxury additional bedrooms in Barnes' characterful homes.
Learn more →Bespoke Home Renovations Barnes
Complete renovations transforming Barnes village properties into meticulously crafted modern family homes.
Learn more →Basement Conversions Barnes
Expert basement conversion creating premium additional living space beneath your Barnes property.
Learn more →Groundworks Barnes
Professional foundations and drainage for premium construction projects across Barnes SW13.
Learn more →Hard Landscaping Barnes
Elegant garden designs and bespoke outdoor spaces complementing Barnes' idyllic village setting.
Learn more →House and kitchen extensions in Barnes
Barnes has Georgian and Victorian villas around Barnes Green and Castelnau, Victorian and Edwardian terraces off Church Road and White Hart Lane, and the riverside houses along The Terrace. Kitchen extensions and orangery-style rear extensions are the most requested Barnes projects, usually with structural glazing; basements and lower-ground extensions are popular where gardens are shallow.
As a guide, a well-built single-storey rear or side-return extension in Barnes costs around £2,500–£4,000 per m² including structure, glazing and finishes, so a typical 25–30 m² kitchen extension lands between £75,000 and £120,000. Our house extension cost guide explains what moves the price. Large parts of Barnes are in conservation areas, including Barnes Green and Castelnau, so Richmond upon Thames Council looks closely at roof extensions and street-facing alterations. We confirm permitted development rights at the first visit and handle any application to Richmond upon Thames Council through our design team.
Planning a kitchen extension? See our kitchen extensions page for layouts, glazing and costs.
Loft conversions in Barnes
Barnes lofts are mostly rear dormers or full mansards on the Victorian terraces; the villas often have the roof volume for a two-room conversion with a proper staircase.
In London a Velux conversion costs £25,000–£45,000, a dormer loft with a bedroom and en-suite £45,000–£75,000 and a mansard £60,000–£100,000+; our loft conversion cost guide sets out what is included. We survey the roof structure, head height and stair position before we quote a Barnes loft, so the figure reflects the actual roof rather than an assumption.
Renovations and refurbishment in Barnes
Period restoration is the theme in Barnes: sash windows, cornices, fireplaces and lime plaster alongside new kitchens, bathrooms and services. Typical Barnes refurbishments include structural openings with steel beams, new kitchens and bathrooms, rewiring, heating and period repairs such as sash windows, cornices and floors. Our Victorian terrace renovation cost guide gives realistic budgets, and every Barnes project runs on a JCT contract with a written specification and our 10-year workmanship warranty.
Guides for homes in Barnes
For the period townhouses, mews and conservation areas of Barnes, our most useful guides are mansard loft conversion costs, basement conversion costs, extending in a conservation area, leaking lead roof valleys and damp basements and tanking.
Planning approvals in Barnes
Official government figures show Richmond upon Thames Council approved 83.3% of householder planning applications decided between July 2025 and June 2026, against 85.8% across London.
See how every London borough compares, including loft and extension approval rates, in our 2026 London planning approvals study.
Alstruct projects near Barnes
Hammersmith Terrace, W6
A terraced house reworked from the lower ground floor to a new loft floor, with a new steel frame and a full refit.
View project →Notting Hill Villa, W11
Every lead valley renewed on a period villa roof, and the basement store waterproofed and reinstated.
View project →Wimbledon Victorian Terrace, SW19
A Victorian terrace extended and reconfigured, with a dormer loft bedroom, three bathrooms and a low-carbon refit.
View project →Beyond the projects above, we have recent and current sites in W4, W14, NW8, NW6, W12 and SW6 within about five miles of Barnes, and we work across every London borough from our office in South Woodford, E18. See all completed projects →
Common questions about building in Barnes
Do I need planning permission for an extension in Barnes?
Houses (not flats or maisonettes) keep national permitted development rights for a single-storey rear extension (3m attached, 4m detached, or 6m and 8m with prior approval) and most rear dormers (40 cubic metres on a terrace, 50 otherwise). Barnes is in Richmond upon Thames Council. Large parts are in the Barnes Green, Castelnau, Barnes Common, Mill Hill, White Hart Lane and Thorne Passage conservation areas, where side extensions, two-storey rear extensions, cladding and roof additions need permission. Article 4 directions remove further rights on some Barnes Green streets and at 1–7 Castelnau Row, and any basement needs permission borough-wide.
What does Richmond upon Thames Council expect for basements in Barnes?
Two Article 4 directions in force since 1 April 2018 remove permitted development rights for basements across the whole borough, so every basement in Barnes needs planning permission. The Richmond Local Plan 2024–2039, Policy 54, limits a house to one storey below ground and to no more than 50% of the existing garden, with 1m of permeable soil and a 200mm drainage layer over any part under the garden. Flood risk screening and a construction management plan are also required. The Barnes Village Planning Guidance SPD (2016) flags new basements as a threat in several character areas.
What does a basement conversion cost in Barnes?
Where a Barnes house has an existing cellar, converting it typically costs £2,500–£4,000 per m², about £80,000–£150,000 for 30–40 m². A full excavation is £4,500–£6,500 per m². These basement figures exclude VAT. For the roof, a mansard loft conversion on a Barnes terrace is £60,000–£100,000+ including VAT, with prime central schemes at £120,000–£150,000. Our basement conversion cost guide explains what drives the price.
Which Alstruct projects are nearest to Barnes?
Just across Hammersmith Bridge, Hammersmith Terrace, W6 is about 1.5 miles away: a terraced house reworked from the lower ground floor to a new loft floor, with a new steel frame and a full refit. Notting Hill Villa, W11, about 3.2 miles away, had every lead valley on its roof renewed and its basement store waterproofed and reinstated. Wimbledon Victorian Terrace, SW19, about 3.8 miles away, was extended and reconfigured with a dormer loft bedroom, three bathrooms and a low-carbon refit.
Which parts of Barnes do you cover?
We cover Barnes SW13, including Barnes Green, Castelnau, the terraces off Church Road and White Hart Lane, and the riverside houses along The Terrace. All of Barnes is in Richmond upon Thames Council. We work from South Woodford E18, about 14 miles away, and also cover Richmond, Putney and Chiswick.
Nearby areas we cover
Alstruct works across every London borough. Here are areas close to Barnes with dedicated local pages: