Garden room drawings in London

Do you need planning permission for a garden room?

Often you do not. Outbuildings are covered by Class E of Part 1, Schedule 2 of the General Permitted Development Order, and a Lawful Development Certificate gives written proof if a buyer or lender asks. The limits are specific, so we check each one on your plot.

Height comes first. The order says: Max 2.5 m if within 2 m of a boundary; otherwise 4 m dual-pitched roof or 3 m any other roof. On eaves, the figure is 2.5 m. For layout it requires the following: Single storey only; not forward of the principal elevation.

Use matters as much as size. The rule reads: Use must be incidental to the house; not a separate dwelling; no verandah, balcony or raised platform. A garden room that is rented out or lived in as a separate home is a different project, which our flat conversion drawings and change of use drawings pages cover.

Conservation areas, listed houses and the garden

Special land changes the answer. Within the curtilage of a listed house, the rule is stark: Garden buildings within the curtilage of a listed building are not permitted development. In a conservation area there is a side-of-house restriction: On article 2(3) land, no outbuilding between a side wall and the boundary.

Garden size matters too. The order caps coverage like this: Buildings may not cover more than 50% of the curtilage (excluding the original house). In a small London garden, that cap can be reached sooner than owners expect once a shed and patio are counted.

When any of these rules is failed, the route is a householder application, and our planning drawings set carries it. Where an application is needed for a building within the boundary of an existing home, the national fee is £272 from the current fee table, paid to the council.

Building Regulations for outbuildings

Planning and Building Regulations are separate. Small detached buildings can be exempt from the Regulations, which saves a building control application. The first exemption: Detached building up to 15 m² with no sleeping accommodation is exempt.

The second is wider: Detached single-storey building up to 30 m², no sleeping accommodation, at least 1 m from the boundary or substantially non-combustible, is exempt. The words that matter are no sleeping accommodation. A garden room with a bed used as a guest room loses the exemption and needs technical drawings.

If your room is not exempt, our building regulations drawings service adds the foundation, insulation and electrical notes the building control body needs.

Garden room drawing prices

Garden room drawings start at £495, VAT included, published before you commit. That is the fixed fee for the drawing set; the council's application fee, if one is due, is paid to the council.

The set is built to be useful twice: as the planning or certificate submission and as the drawing a builder or kit supplier quotes from.

If the council asks for changes we redraw at no charge until approval. We do not promise a result; we draw to the rules above and then deal with the officer for you.

How the drawings come together

You send the address and what the room is for. We run a constraints check, decide whether it is permitted development, a certificate or an application, and send a fixed quote. A measured survey of the garden fixes the boundaries, levels, trees and drains.

We show the design in 3D, you pick an option in writing, and a second chartered technologist checks every sheet before it goes anywhere. A measured building survey can cover the house too, if the room joins it.

Drawings are normally ready about a week after the survey.

Settle the position and the use first

Where the building sits changes the answer more than its size. A garden room at the far end of a long garden is judged differently from one beside the house, and the height limit tightens near a boundary. We draw the position on the block plan with its distance to every boundary, so you can see which rule bites.

Use matters too. A home office, gym or studio is incidental to the house. A room let out, or lived in as a separate home, is not. If you might ever rent it, tell us now, because it changes both the planning route and the Building Regulations position.

Power, drainage and heating add their own requirements. We list the services on the drawings so your builder prices them once. A clear location and block plan shows the council exactly where the building sits.

Garden room drawings by council

Garden rules are national, but conservation areas, Article 4 directions and listed buildings vary by borough. Each council page sets out those local figures. See architectural drawings in Camden for how heritage designations can change a garden project.

Find your borough through architectural drawings by area.