Garden room drawings in Bromley

Green Belt, and why it changes the design

About 51 per cent of the borough is Green Belt, so a good number of gardens sit inside it. A garden room there is still an outbuilding under Class E, but when it needs an application the council tests it against openness, which favours a small, low building close to the house.

The practical effect is on position. A room tucked beside the house or an existing garage is easier to justify than a freestanding building at the far end of a long plot. We draw the candidate positions and show the distance from the house for each, so the choice is made with the rule in view.

Domestic gardens make up 23.4 per cent of the borough's land in the government's generalised land use database. Gardens are plentiful, but space is not the limit here; the designation is.

What Bromley publishes for householder design

Bromley's design advice sits in the Urban Design Guide SPD, under the Bromley Local Plan, adopted in 2,019. We checked the borough's published guidance for a footprint or height figure specific to garden buildings and found none we can quote with a reference, so we do not state one.

In that gap we design to the national Class E limits and show how the room sits against neighbours. The rule on coverage still bites: Buildings may not cover more than 50% of the curtilage (excluding the original house). Existing sheds, garages and paving covers all count against it.

The use rule matters equally: Use must be incidental to the house; not a separate dwelling; no verandah, balcony or raised platform. We draw and label the room so that it reads as a studio, office or gym.

Bromley's record on householder applications and appeals

In its latest published year Bromley decided 1,609 householder applications. It granted 78.6 per cent, and 89.1 per cent were decided within the statutory period. Build some decision time into your programme.

The Planning Inspectorate decided 502 householder appeals here over the latest five-year period and allowed 37.6 per cent. Those are borough-wide figures for every kind of householder work. They are context, and they do not forecast your scheme, but they show that a careful submission is worth the effort.

The average Bromley home sold for £511,670, and prices changed by -3.1 per cent over the past year.

Sloping gardens, trees and drainage

Where a garden falls away from the house, the height of a garden room is measured from the highest natural ground level next to it. A building that looks modest on the upper side can stand tall on the lower one, and the neighbour below will notice. We take levels on the survey and show the section with the true ground line.

Trees may be protected. A root protection area close to the footprint can mean a pile foundation, a smaller room or a different position, and we show the root zone on the block plan so the officer can see it was considered.

Surface water needs a plan too, since a new roof adds run-off. A water butt or soakaway is a simple note on the drawing that answers a question the officer would otherwise ask.

Certificate, application or building control

When a garden room fits Class E and nothing in the address blocks it, a Lawful Development Certificate in Bromley gives written proof. On height 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.

Where it does not fit, the route is a householder application, prepared as planning drawings in Bromley, with a national fee of £272 for works within an existing home's boundary. Over a certain size or with a bed, the room must also meet Building Regulations; the smaller exemption is worded Detached building up to 15 m² with no sleeping accommodation is exempt.

Where the room is fitted out as a full working space with services, our building regulations drawings in Bromley cover the technical sheets.

From survey to issue

On a large Bromley plot we start with a measured survey, because levels and tree positions are often the real constraint on a sloping garden. Then we draw two or three positions in 3D, you choose one in writing, and the set is prepared and checked by a second chartered technologist.

The set starts at £495 with VAT included. It contains the block plan, floor plan, elevations, a section and a materials note. If the council asks for changes, we redraw them free of charge.

Other services and neighbouring boroughs

If you also plan to extend, see rear extension drawings in Bromley and house extension drawings in Bromley. The full picture of our work is at architectural drawings in Bromley. Owners near the border can also compare garden room drawings in Croydon and Bexley.