House extensions in London
House extensions in London: more kitchen, more bedroom, more you. Describe the project and up to 3 local builders will get in touch to quote.
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✅ What your house extensions covers in London
- Plans and drawings, or working to yours
- Building regulations and party wall help
- Foundations, walls, roof and windows
- Plastering, electrics and plumbing coordinated
- A clear timeline and staged payments
💷 Typical house extensions prices in London
| Single-storey rear extension | £2,800 to £4,000 per m² |
| Double-storey extension | £2,200 to £3,500 per m² |
| Side return extension | £3,000 to £4,200 per m² |
💬 Questions about house extensions in London
Do I need planning permission in London?
Many rear extensions fall under permitted development, so they don't need full planning permission. Rules are stricter in conservation areas and for flats. Check with the council or ask builders when they quote.
How long does an extension take?
A single-storey extension is often 3 to 5 months from first dig to final snag, plus time for plans and approvals. Your builder will give you a timeline.
What should the quote include?
A written breakdown of labour and materials, a start date, a payment schedule tied to stages of work, and who handles skips and waste.
📍 Find house extensions by borough
- Barking and DagenhamIG11, RM8, RM9, RM10
- BarnetN2, N3, N11, N12, N20, NW4, NW7, NW9, NW11, EN4, EN5, HA8
- BexleyDA5, DA6, DA7, DA8, DA14, DA15, DA16, DA17, SE2
- BrentNW2, NW10, HA0, HA9
- BromleyBR1, BR2, BR3, BR4, BR5, BR6, BR7, SE20
- CamdenNW1, NW3, NW5, NW6, WC1
- City of LondonEC1, EC2, EC3, EC4
- CroydonCR0, CR2, CR7, CR8, SE19, SE25
- EalingW3, W5, W7, W13, UB1, UB2, UB5, UB6
- EnfieldEN1, EN2, EN3, N9, N13, N14, N18, N21
- GreenwichSE3, SE7, SE9, SE10, SE18, SE28
- HackneyE5, E8, E9, N16
- Hammersmith and FulhamW6, W12, W14, SW6
- HaringeyN6, N8, N10, N15, N17, N22
- HarrowHA1, HA2, HA3, HA5, HA7
- HaveringRM1, RM2, RM3, RM5, RM7, RM11, RM12, RM13, RM14
- HillingdonHA4, HA6, UB3, UB4, UB7, UB8, UB10
- HounslowW4, TW3, TW4, TW5, TW7, TW8, TW13, TW14
- IslingtonN1, N4, N5, N7, N19
- Kensington and ChelseaW8, W10, W11, SW3, SW5, SW7, SW10
- Kingston upon ThamesKT1, KT2, KT3, KT6, KT9
- LambethSE11, SE24, SE27, SW2, SW4, SW8, SW9, SW16
- LewishamSE4, SE6, SE8, SE12, SE13, SE14, SE23, SE26
- MertonSW19, SW20, CR4, SM4
- NewhamE6, E7, E12, E13, E15, E16, E20
- RedbridgeIG1, IG2, IG3, IG4, IG5, IG6, IG8, E18
- Richmond upon ThamesTW1, TW2, TW9, TW10, TW11, TW12, SW13, SW14
- SouthwarkSE1, SE5, SE15, SE16, SE17, SE21, SE22
- SuttonSM1, SM2, SM3, SM5, SM6
- Tower HamletsE1, E1W, E2, E3, E14
- Waltham ForestE4, E10, E11, E17
- WandsworthSW11, SW12, SW15, SW17, SW18
- WestminsterW1, W2, W9, SW1, NW8, WC2
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