SERVICE

Rear extension by area

Planning route checks

Use this hub to open the district-specific guide for a rear extension. The area pages cover local borough context, likely approvals, cost signals and the exact-address check needed before you rely on permitted development or any consent route.

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READ

Related guidance

Rear extension

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Side return extension

Infilling the Victorian alley for a full-width kitchen.

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Do you need planning permission for a rear extension in London?

The size limits, the exceptions, and the postcode-level traps.

Open guide
How much does a rear extension cost in London? 2026 £/m² ranges

Real ranges from real projects — not brochure numbers.

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Prior approval: the larger home extension (6m and 8m) rule

Bigger single-storey rear extensions without a full planning application — but it's a notification process, not a free pass.

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Party walls: notices, awards, and your neighbours

Almost every London extension, loft and basement engages this Act. Here's how it actually works.

Open guide
AREAS

Rear extension in served areas

Rear extension in NW1

First check: Whether it's permitted development or needs a planning application

Service guide →
Rear extension in NW3

First check: Whether it's permitted development or needs a planning application

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Rear extension in NW5

First check: Whether it's permitted development or needs a planning application

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Rear extension in NW6

First check: Whether it's permitted development or needs a planning application

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Rear extension in WC1

First check: Whether it's permitted development or needs a planning application

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Rear extension in W1

First check: Whether it's permitted development or needs a planning application

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Rear extension in W2

First check: Whether it's permitted development or needs a planning application

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Rear extension in W9

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW1

First check: Whether it's permitted development or needs a planning application

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Rear extension in NW8

First check: Whether it's permitted development or needs a planning application

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Rear extension in N1

First check: Whether it's permitted development or needs a planning application

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Rear extension in N5

First check: Whether it's permitted development or needs a planning application

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Rear extension in N7

First check: Whether it's permitted development or needs a planning application

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Rear extension in N19

First check: Whether it's permitted development or needs a planning application

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Rear extension in EC1

First check: Whether it's permitted development or needs a planning application

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Rear extension in E8

First check: Whether it's permitted development or needs a planning application

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Rear extension in E9

First check: Whether it's permitted development or needs a planning application

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Rear extension in E5

First check: Whether it's permitted development or needs a planning application

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Rear extension in N16

First check: Whether it's permitted development or needs a planning application

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Rear extension in N4

First check: Whether it's permitted development or needs a planning application

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Rear extension in N8

First check: Whether it's permitted development or needs a planning application

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Rear extension in N10

First check: Whether it's permitted development or needs a planning application

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Rear extension in N15

First check: Whether it's permitted development or needs a planning application

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Rear extension in N22

First check: Whether it's permitted development or needs a planning application

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Rear extension in N6

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW3

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW7

First check: Whether it's permitted development or needs a planning application

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Rear extension in W8

First check: Whether it's permitted development or needs a planning application

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Rear extension in W11

First check: Whether it's permitted development or needs a planning application

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Rear extension in W10

First check: Whether it's permitted development or needs a planning application

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Rear extension in W6

First check: Whether it's permitted development or needs a planning application

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Rear extension in W12

First check: Whether it's permitted development or needs a planning application

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Rear extension in W14

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW6

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE1

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE5

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE15

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE16

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE22

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW4

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW2

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW9

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE11

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE24

First check: Whether it's permitted development or needs a planning application

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Rear extension in E1

First check: Whether it's permitted development or needs a planning application

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Rear extension in E2

First check: Whether it's permitted development or needs a planning application

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Rear extension in E3

First check: Whether it's permitted development or needs a planning application

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Rear extension in E14

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW18

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW11

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW12

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW15

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW17

First check: Whether it's permitted development or needs a planning application

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Rear extension in TW9

First check: Whether it's permitted development or needs a planning application

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Rear extension in TW10

First check: Whether it's permitted development or needs a planning application

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Rear extension in TW1

First check: Whether it's permitted development or needs a planning application

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Rear extension in TW11

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW14

First check: Whether it's permitted development or needs a planning application

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Rear extension in NW11

First check: Whether it's permitted development or needs a planning application

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Rear extension in NW7

First check: Whether it's permitted development or needs a planning application

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Rear extension in N20

First check: Whether it's permitted development or needs a planning application

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Rear extension in N3

First check: Whether it's permitted development or needs a planning application

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Rear extension in EN5

First check: Whether it's permitted development or needs a planning application

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Rear extension in W5

First check: Whether it's permitted development or needs a planning application

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Rear extension in W13

First check: Whether it's permitted development or needs a planning application

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Rear extension in W7

First check: Whether it's permitted development or needs a planning application

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Rear extension in W3

First check: Whether it's permitted development or needs a planning application

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Rear extension in UB2

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW19

First check: Whether it's permitted development or needs a planning application

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Rear extension in SW20

First check: Whether it's permitted development or needs a planning application

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Rear extension in CR4

First check: Whether it's permitted development or needs a planning application

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Rear extension in SM4

First check: Whether it's permitted development or needs a planning application

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Rear extension in KT1

First check: Whether it's permitted development or needs a planning application

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Rear extension in KT2

First check: Whether it's permitted development or needs a planning application

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Rear extension in KT6

First check: Whether it's permitted development or needs a planning application

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Rear extension in KT3

First check: Whether it's permitted development or needs a planning application

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Rear extension in KT4

First check: Whether it's permitted development or needs a planning application

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Rear extension in BR1

First check: Whether it's permitted development or needs a planning application

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Rear extension in BR2

First check: Whether it's permitted development or needs a planning application

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Rear extension in BR3

First check: Whether it's permitted development or needs a planning application

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Rear extension in BR6

First check: Whether it's permitted development or needs a planning application

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Rear extension in BR7

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE20

First check: Whether it's permitted development or needs a planning application

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Rear extension in HA1

First check: Whether it's permitted development or needs a planning application

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Rear extension in HA5

First check: Whether it's permitted development or needs a planning application

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Rear extension in HA7

First check: Whether it's permitted development or needs a planning application

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Rear extension in HA2

First check: Whether it's permitted development or needs a planning application

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Rear extension in HA3

First check: Whether it's permitted development or needs a planning application

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Rear extension in NW2

First check: Whether it's permitted development or needs a planning application

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Rear extension in NW10

First check: Whether it's permitted development or needs a planning application

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Rear extension in NW9

First check: Whether it's permitted development or needs a planning application

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Rear extension in HA9

First check: Whether it's permitted development or needs a planning application

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Rear extension in HA0

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE10

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE3

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE7

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE9

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE18

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE4

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE13

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE23

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE8

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE14

First check: Whether it's permitted development or needs a planning application

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Rear extension in EN2

First check: Whether it's permitted development or needs a planning application

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Rear extension in EN1

First check: Whether it's permitted development or needs a planning application

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Rear extension in N21

First check: Whether it's permitted development or needs a planning application

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Rear extension in N14

First check: Whether it's permitted development or needs a planning application

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Rear extension in EN3

First check: Whether it's permitted development or needs a planning application

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Rear extension in E17

First check: Whether it's permitted development or needs a planning application

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Rear extension in E10

First check: Whether it's permitted development or needs a planning application

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Rear extension in E11

First check: Whether it's permitted development or needs a planning application

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Rear extension in E4

First check: Whether it's permitted development or needs a planning application

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Rear extension in SM1

First check: Whether it's permitted development or needs a planning application

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Rear extension in SM5

First check: Whether it's permitted development or needs a planning application

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Rear extension in SM2

First check: Whether it's permitted development or needs a planning application

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Rear extension in SM3

First check: Whether it's permitted development or needs a planning application

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Rear extension in SM6

First check: Whether it's permitted development or needs a planning application

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Rear extension in CR0

First check: Whether it's permitted development or needs a planning application

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Rear extension in CR2

First check: Whether it's permitted development or needs a planning application

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Rear extension in CR8

First check: Whether it's permitted development or needs a planning application

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Rear extension in CR5

First check: Whether it's permitted development or needs a planning application

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Rear extension in SE25

First check: Whether it's permitted development or needs a planning application

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Rear extension in DA5

First check: Whether it's permitted development or needs a planning application

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Rear extension in DA6

First check: Whether it's permitted development or needs a planning application

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Rear extension in DA7

First check: Whether it's permitted development or needs a planning application

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Rear extension in DA8

First check: Whether it's permitted development or needs a planning application

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Rear extension in DA15

First check: Whether it's permitted development or needs a planning application

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Rear extension in W4

First check: Whether it's permitted development or needs a planning application

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Rear extension in TW8

First check: Whether it's permitted development or needs a planning application

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Rear extension in TW7

First check: Whether it's permitted development or needs a planning application

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Rear extension in TW3

First check: Whether it's permitted development or needs a planning application

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Rear extension in TW13

First check: Whether it's permitted development or needs a planning application

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Rear extension in UB10

First check: Whether it's permitted development or needs a planning application

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Rear extension in UB8

First check: Whether it's permitted development or needs a planning application

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Rear extension in HA4

First check: Whether it's permitted development or needs a planning application

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Rear extension in HA6

First check: Whether it's permitted development or needs a planning application

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Rear extension in UB7

First check: Whether it's permitted development or needs a planning application

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Rear extension in IG1

First check: Whether it's permitted development or needs a planning application

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Rear extension in IG8

First check: Whether it's permitted development or needs a planning application

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Rear extension in E18

First check: Whether it's permitted development or needs a planning application

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Rear extension in IG2

First check: Whether it's permitted development or needs a planning application

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Rear extension in IG6

First check: Whether it's permitted development or needs a planning application

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Rear extension in RM1

First check: Whether it's permitted development or needs a planning application

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Rear extension in RM2

First check: Whether it's permitted development or needs a planning application

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Rear extension in RM11

First check: Whether it's permitted development or needs a planning application

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Rear extension in RM14

First check: Whether it's permitted development or needs a planning application

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Rear extension in RM13

First check: Whether it's permitted development or needs a planning application

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Rear extension in E15

First check: Whether it's permitted development or needs a planning application

Service guide →
Rear extension in E7

First check: Whether it's permitted development or needs a planning application

Service guide →
Rear extension in E6

First check: Whether it's permitted development or needs a planning application

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Rear extension in E13

First check: Whether it's permitted development or needs a planning application

Service guide →
Rear extension in E16

First check: Whether it's permitted development or needs a planning application

Service guide →
Rear extension in IG11

First check: Whether it's permitted development or needs a planning application

Service guide →
Rear extension in RM8

First check: Whether it's permitted development or needs a planning application

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Rear extension in RM9

First check: Whether it's permitted development or needs a planning application

Service guide →
Rear extension in RM10

First check: Whether it's permitted development or needs a planning application

Service guide →
Rear extension in EC2

First check: Whether it's permitted development or needs a planning application

Service guide →
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