Find trusted local builders in Balham (SW12, SW17) for rear extensions, loft conversions and full refurbishments. Post a job free — builders contact you within hours.
Rear kitchen extensions and open-plan remodelling — Balham's most popular building project. Victorian terraces in SW12 and SW17 covered.
Find a builder →Dormer loft conversions adding a bedroom and bathroom across Balham. Party wall notices served and structural works fully managed.
Find a builder →Full property refurbishments for young families and investors across SW12 and SW17. All trades coordinated from start to finish.
Find a builder →Commercial fit-outs for retail, hospitality and office occupiers along Balham High Road and surrounding areas.
Find a builder →RSJ steel beam installation, load-bearing wall removal, and party wall works. Experienced with Balham's tightly-packed terrace streets.
Find a builder →Garden rooms and studios popular with Balham homeowners. New build projects also considered across SW12 and SW17.
Find a builder →| Job | Low estimate | High estimate |
|---|---|---|
| Single-storey rear extension | £25,000 | £50,000 |
| Double-storey extension | £45,000 | £90,000 |
| Loft conversion (Velux) | £20,000 | £35,000 |
| Loft conversion (dormer) | £35,000 | £65,000 |
| Full house refurbishment (3-bed) | £40,000 | £100,000 |
| Kitchen extension (open plan) | £30,000 | £60,000 |
| Garage conversion | £12,000 | £25,000 |
| Garden room / studio | £15,000 | £40,000 |
| Basement conversion | £40,000 | £80,000 |
| Party wall agreement | £700 | £2,000 |
| Load-bearing wall removal (RSJ) | £1,500 | £4,000 |
| New build (per m²) | £2,000 | £4,000 |
Prices are estimates for Balham 2026. Actual costs vary by specification and complexity. Always get multiple quotes.
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Balham is one of South West London's most active residential building markets. Popular with young families who value good schools, the Northern Line connection, and the village-like feel of the high street, Balham homeowners invest heavily in extensions and loft conversions to gain space rather than upsize to a larger property. Victorian terraces in SW12 are particularly well-suited to rear extensions — many properties have relatively modest rear ground-floor footprints with usable garden space behind, making a single-storey kitchen extension both straightforward and highly valuable.
Party wall agreements are almost always required in Balham's closely-built terrace streets, and experienced local builders will factor the 2-month notice period into their project timelines. Dormer loft conversions are popular throughout SW12 and SW17, adding a bedroom and en-suite and generating significant added value in Balham's strong property market. Some streets in SW12 border the London Borough of Lambeth, so it is worth confirming which council has jurisdiction over your property before submitting any planning applications.
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