Premium Builders in Balham
Premium house extensions, renovations and loft conversions in Balham, London.
Builders in Balham, SW12
Affectionately known as the "Gateway to the South", Balham has established itself as one of South London's most sought-after residential neighbourhoods. The area's handsome Victorian terraces, tree-lined streets and excellent transport links attract a discerning community of young professionals and families who demand quality in every aspect of their homes. Alstruct Ltd provides premium construction services tailored specifically to Balham's period housing stock, helping homeowners unlock the full potential of their SW12 properties.
Balham's residential character is defined predominantly by its fine Victorian terraced housing, with many properties featuring classic London layouts: bay-fronted reception rooms, narrow side returns and generous rear gardens. These homes are perfectly suited to the transformative extensions and loft conversions that Alstruct specialises in. A well-designed rear extension or side return infill can create the open-plan kitchen-living spaces that Balham's lifestyle-conscious residents desire, while a dormer or mansard loft conversion adds a valuable master suite or home office without sacrificing garden space.
Navigating Wandsworth Council's planning requirements is essential for any construction project in Balham. Parts of the area fall within conservation zones where stricter controls apply, and the borough has specific policies on basement developments and party wall matters given the predominantly terraced housing stock. Alstruct's design team prepares applications to Wandsworth's planning department that satisfy local policies while delivering ambitious, design-led results for our clients.
Why Choose Alstruct in Balham?
- Specialist expertise with Victorian terraced properties
- In-depth knowledge of Wandsworth Council planning policies
- CHAS Elite, Constructionline Gold & FMB accredited
- Complimentary site survey and design consultation
- Dedicated project manager for seamless delivery
- Party wall expertise for terraced property projects
- Transparent, fully itemised quotations with no hidden costs
- Published case studies with scope, programme and budget
Construction Services in Balham
Extensions in Balham
Rear, side return and wraparound extensions transforming Balham's Victorian terraces into spacious, light-filled contemporary homes.
Learn more →Loft Conversions in Balham
Dormer and mansard loft conversions adding valuable bedrooms and en-suites to Balham's period properties without sacrificing garden space.
Learn more →Renovations in Balham
Complete property refurbishments creating the open-plan, design-led living spaces that Balham's young professional community demands.
Learn more →Basement Conversions in Balham
Expert basement excavation and conversion beneath Balham's terraces, creating home cinemas, gyms or additional living accommodation.
Learn more →Groundworks in Balham
Professional foundations, underpinning and drainage solutions for Balham's Victorian terraced properties and new-build projects.
Learn more →Landscaping in Balham
Premium patios, garden walls and outdoor entertaining spaces designed to complement Balham's attractive residential streetscapes.
Learn more →House and kitchen extensions in Balham
Balham is dominated by Victorian and Edwardian terraces on the Heaver Estate and around Hyde Farm, with mansion flats along Balham High Road and Nightingale Lane. The classic Balham project is a side-return kitchen extension on a Victorian terrace, often combined with a dig-out of the rear addition to level the floor; wraparounds are common where the plot allows.
Budget guidance for Balham: expect £2,500–£4,000 per m² for a single-storey extension, which puts a 25–30 m² kitchen extension at £75,000–£120,000; two-storey and wraparound schemes are priced on the structure involved (see our house extension cost guide). Nightingale Lane and the Heaver Estate are Wandsworth conservation areas and Hyde Farm a Lambeth one, so dormers there need planning permission and should be kept to the rear in matching materials. Where approval from Wandsworth Council is needed, our design team prepares and submits the application.
Planning a kitchen extension? See our kitchen extensions page for layouts, glazing and costs.
Loft conversions in Balham
Heaver Estate and Hyde Farm roofs suit L-shaped rear dormers over the back addition, which is how most Balham families gain a master suite; hip-to-gable applies mainly to the end-of-terrace houses.
Typical London figures are £25,000–£45,000 for a Velux conversion, £45,000–£75,000 for a dormer and £60,000–£100,000+ for a mansard (details in our loft conversion cost guide). Every Balham loft quote follows a measured survey of the roof, head height and stair position, and includes Building Regulations sign-off, fire doors and structural calculations.
Renovations and refurbishment in Balham
Balham refurbishments usually mean opening up the ground floor, new bathrooms, sash window repair and full redecoration. Typical Balham refurbishments include structural openings with steel beams, new kitchens and bathrooms, rewiring, heating and period repairs such as sash windows, cornices and floors. Budgets are set out in our renovation cost guide; in Balham, as everywhere, we work to a JCT contract, a written specification and a 10-year workmanship warranty.
Guides for homes in Balham
For the Victorian and Edwardian terraces that make up much of Balham, our most useful guides are side return extension costs, dormer loft conversion costs, party wall costs, building over a sewer and heat pumps in Victorian terraces.
Planning approvals in Balham
Wandsworth Council approved 91.5% of householder planning applications decided between September 2025 and August 2026, against a London average of 85.8%; a typical decision took about 8.0 weeks from validation. Loft conversions that needed planning permission were approved 90.2% of the time and extensions 93.8%.
See how every London borough compares, including loft and extension approval rates, in our 2026 London planning approvals study.
Alstruct projects near Balham
Wimbledon Victorian Terrace, SW19
A Victorian terrace extended and reconfigured, with a dormer loft bedroom, three bathrooms and a low-carbon refit.
View project →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 →Beyond the projects above, we have recent and current sites in W14 and SW6 within about five miles of Balham, and we work across every London borough from our office in South Woodford, E18. See all completed projects →
Common questions about building in Balham
Do I need planning permission for an extension in Balham?
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). Most of Balham is in Wandsworth Council; Hyde Farm is in Lambeth Council. Balham includes the Nightingale Lane, Heaver Estate, Culverden Road, Dinsmore Road and Hyde Farm conservation areas, where side extensions, two-storey rear extensions, cladding and roof additions need permission, though a single-storey rear extension can still be permitted development. A Heaver Estate Article 4 direction controls street-facing windows, doors, roofs, porches and front boundaries. See our permitted development guide.
What does Wandsworth Council expect for loft conversions in Balham?
Wandsworth's Local Plan Policy LP5 asks for dormers and other roof alterations to be kept to the rear, in matching or complementary materials. The council's Housing SPD (2016) says a mansard-style addition on the rear slope of a mid-terrace house between party walls is usually acceptable where it is not clearly seen from the street. On end-of-terrace and corner houses it prefers a rear dormer set below the ridge and in from the roof edge. In conservation areas such as Nightingale Lane and the Heaver Estate, mansards on roofs visible from public areas are unlikely to be accepted.
What does a side return extension cost in Balham?
Balham's Victorian terraces, with their narrow side returns, are where this project is most common. A side return extension typically costs £65,000–£130,000 at mid to high specification, including VAT. Many Balham owners add a loft in the same job: a rear dormer loft is £45,000–£75,000 and an L-shaped dormer £55,000–£85,000, also including VAT. Depth, glazing, steelwork and the kitchen decide where a project falls in the range. Our Victorian side return extension cost guide breaks the figures down.
Which Alstruct projects are nearest to Balham?
The nearest published project is Wimbledon Victorian Terrace, SW19, about 2.8 miles away: a Victorian terrace extended and reconfigured, with a dormer loft bedroom, three bathrooms and a low-carbon refit. Hammersmith Terrace, W6, about 4.7 miles away, was reworked from the lower ground floor to a new loft floor, with a new steel frame and a full refit. At Notting Hill Villa, W11, about 5.3 miles away, every lead valley on the roof was renewed and the basement store waterproofed and reinstated.
Which parts of Balham do you cover?
We cover the whole of Balham SW12, from Balham High Road and Nightingale Lane to the Heaver Estate, Hyde Farm and the streets towards Wandsworth Common and Tooting Bec Common. Most of the area is in Wandsworth Council and Hyde Farm is in Lambeth Council, and we work with both. Our office is in South Woodford E18, about 13 miles away. We also work in neighbouring Tooting, Clapham and Wandsworth.
Nearby areas we cover
Alstruct works across every London borough. Here are areas close to Balham with dedicated local pages: