London-wide cover
House extensions in every London borough
Every London borough has its own planning stance, housing stock and party wall reality. Pick yours below for a borough-specific cost range, planning note and shortlist of KYB-verified builders active in your postcodes.
Central London
2 boroughs
North London
5 boroughs
North London · Prime tier
Camden extensions
£130k–£195k typical · NW1, NW3, NW5
Borough page
North London · Inner
Islington extensions
£125k–£185k typical · N1, N5, N7
Borough page
North London · Outer
Barnet extensions
£95k–£155k typical · EN5, N3, N12
Borough page
North London · Outer
Enfield extensions
£90k–£145k typical · EN1, EN2, EN3
Borough page
North London · Inner
Haringey extensions
£115k–£170k typical · N4, N8, N15
Borough page
East London
7 boroughs
East London · Inner
Hackney extensions
£120k–£180k typical · E1, E2, E5
Borough page
East London · Inner
Tower Hamlets extensions
£125k–£185k typical · E1, E2, E3
Borough page
East London · Outer
Newham extensions
£90k–£145k typical · E6, E7, E12
Borough page
East London · Outer
Redbridge extensions
£90k–£145k typical · IG1, IG2, IG4
Borough page
East London · Inner
Waltham Forest extensions
£105k–£160k typical · E4, E10, E11
Borough page
East London · Outer
Barking & Dagenham extensions
£85k–£135k typical · IG11, RM8, RM9
Borough page
East London · Outer
Havering extensions
£85k–£135k typical · RM1, RM2, RM11
Borough page
South London
12 boroughs
South London · Outer
Croydon extensions
£90k–£145k typical · CR0, CR2, CR5
Borough page
South London · Outer
Bromley extensions
£100k–£155k typical · BR1, BR2, BR3
Borough page
South London · Inner
Lambeth extensions
£115k–£175k typical · SW2, SW4, SW8
Borough page
South London · Inner
Southwark extensions
£115k–£175k typical · SE1, SE5, SE15
Borough page
South London · Inner
Wandsworth extensions
£125k–£185k typical · SW11, SW12, SW15
Borough page
South London · Inner
Lewisham extensions
£105k–£160k typical · SE4, SE6, SE8
Borough page
South London · Outer
Greenwich extensions
£100k–£155k typical · SE3, SE7, SE9
Borough page
South London · Outer
Bexley extensions
£85k–£135k typical · DA5, DA6, DA7
Borough page
South London · Outer
Sutton extensions
£90k–£140k typical · SM1, SM2, SM3
Borough page
South London · Inner
Merton extensions
£110k–£170k typical · SW19, SW20, CR4
Borough page
South London · Outer
Kingston upon Thames extensions
£100k–£155k typical · KT1, KT2, KT3
Borough page
South London · Prime tier
Richmond upon Thames extensions
£125k–£185k typical · TW1, TW2, TW9
Borough page
West London
7 boroughs
West London · Outer
Ealing extensions
£105k–£160k typical · W3, W5, W7
Borough page
West London · Outer
Hounslow extensions
£95k–£155k typical · TW3, TW4, TW5
Borough page
West London · Inner
Hammersmith & Fulham extensions
£130k–£195k typical · W6, W12, W14
Borough page
West London · Prime tier
Kensington & Chelsea extensions
£180k–£300k typical · SW3, SW5, SW7
Borough page
West London · Outer
Brent extensions
£95k–£155k typical · NW2, NW6, NW9
Borough page
West London · Outer
Harrow extensions
£90k–£145k typical · HA1, HA2, HA3
Borough page
West London · Outer
Hillingdon extensions
£85k–£140k typical · UB3, UB4, UB7
Borough page