Find trusted local builders in Greenwich (SE10, SE3, SE18, SE7) for extensions, loft conversions, refurbishments and commercial fit-outs. Post a job free — builders contact you within hours.
Rear extensions and open-plan remodelling across Greenwich, Blackheath, Charlton and Woolwich. Heritage-sensitive builds where needed.
Find a builder →Dormer and Velux loft conversions in Blackheath and Charlton. Planning advice for conservation-area properties included.
Find a builder →Victorian and Edwardian property refurbishments across SE10 and SE3. Period features preserved where required or desired.
Find a builder →Commercial refurbishments and office fit-outs in Woolwich town centre and the wider Woolwich regeneration zone.
Find a builder →RSJ steel beam installation, load-bearing wall removal, and party wall agreements across Greenwich's terraced streets.
Find a builder →Garden studios, outbuildings and annexes for Greenwich properties. New build projects also taken on across SE7 and SE18.
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 Greenwich 2026. Conservation area requirements may affect costs. Always get multiple quotes.
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Greenwich has one of the most varied building landscapes in South East London. The heritage conservation area around Greenwich town centre and the UNESCO World Heritage Site buffer zone impose meaningful constraints on certain types of external works — particularly extensions that would be visible from the park or the riverfront. Properties in the Blackheath conservation area (SE3) and around Clapham (SE10) require full planning applications for many works that would be Permitted Development elsewhere. Builders experienced in Greenwich understand these constraints and can advise on what is and is not feasible before you invest in detailed drawings.
Away from the conservation zones, Charlton and Woolwich (SE7 and SE18) offer a much more straightforward planning environment. Victorian and Edwardian terraces here are popular for dormer loft conversions and rear kitchen extensions, and the area's relatively competitive build costs make extensions a strong value proposition. The Woolwich regeneration — including the Elizabeth Line station opening — has also generated significant commercial fit-out demand, as new occupiers establish businesses in the town centre and surrounding development areas.
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