Garden annexes in Blackheath

Covering Blackheath

Blackheath sits 7 miles south-east of London, with Greenwich 1 miles to the north-west and Catford 2 miles to the south-west.

Homes in London

Terraced houses dominate many London neighbourhoods, so most projects involve shared walls, narrow access and a party wall process. Conservation areas are widespread, and some boroughs have their own mansard and basement guidance.

What goes into a garden annexe?

We design annexes as permanent buildings with proper foundations, insulation and services, and we prepare the planning case showing how the annexe will be used as part of the main home. Connections for water, drainage and power are planned from the start.

Design and planning application
Brick, block or timber-frame structure
Heating, hot water and electrics

How much does a garden annexe cost in Blackheath?

Guide prices for garden annexes, including VAT where it applies. Your fixed price is confirmed in writing after the survey.

Garden annexes	Guide price incl. VAT
Standard specification	£2,400 to £2,900 per m²
Good specification	£2,900 to £3,400 per m²
High specification	£3,400 to £3,900 per m²

How is a garden annexe approved in Blackheath?

Projects in England go through two separate checks. Planning (or confirmation that the work is permitted development) comes from the district, borough or unitary council, and building regulations approval comes from the council’s building control team or a registered building control approver. Where work touches a shared wall or digs near a neighbour’s foundations, the Party Wall etc. Act 1996 applies.

A self-contained annexe used for sleeping and living normally needs planning permission in England.

What should Blackheath homeowners check first?

The annexe normally has to remain part of the main household, not let as a separate home.
A level threshold and wider doors make the annexe suitable for later life.

What are the steps?

Start with a conversation. A short call or the online form is enough for us to understand what you want to build.
We visit and measure. A surveyor checks the house, the boundaries and the ground, and discusses what is realistic.
Design and fixed price. You get drawings and a written price for the agreed specification before anything is ordered.
Construction and completion. One site lead co-ordinates every trade through to the building control certificate.

Your questions answered

Do I need planning permission for a garden annexe?

Usually yes, because people will sleep in it. Outbuilding permitted development does not cover living accommodation.

Can you make it wheelchair accessible?

Yes. Level access, wider doors and a level-access shower can be designed in from the start.

Do you work in Blackheath?

Yes. Blackheath is within our coverage for garden annexes, along with nearby Greenwich and Catford.

Also covering

Learn more about garden annexes, or see every project we cover in Blackheath.