Garage conversion plans in Southwark

Southwark's Article 4 directions and heritage

National planning data lists 480 Article 4 directions in Southwark and the council publishes 53 conservation areas. Where a direction applies, the right to alter the front of a house without an application can be withdrawn, and a changed garage front is exactly the sort of work it catches.

Historic England records 919 listed entries here. A listing can cover a garage or outbuilding that looks like a later addition, so we check the national list as well as the council map. On a listed house even internal works may need consent.

Protected trees also shape a garage frontage. The planning data service records 724 tree preservation zones, and a protected tree beside a drive can move a drain run or a new opening.

Where we cut into or underpin a wall shared with a neighbour, the Party Wall etc. Act 1996 may apply, and the plans mark it.

Householder guidance and what it leaves open

The council's Householder development SPD works with the Southwark Plan 2022 and is the guide a garage conversion is read against, because the front of the building changes. We found no figure in it that applies only to garages.

That leaves the proposal to be judged on its look and its neighbours. The elevation sheet therefore shows the infilled opening, the window and the brick beside the houses either side, so the officer is comparing like with like.

Picking the route in Southwark

The law starts in your favour: Works affecting only the interior, or not materially affecting external appearance, are not development. If the door stays and no condition on the original permission removes that freedom, you may need no application.

Change the front inside an Article 4 area and an application normally follows. We decide this in the free constraints check. A clear internal conversion is confirmed with a Lawful Development Certificate in Southwark, and a protected front goes in with our planning drawings in Southwark, where the council fee is £548.

The borough also holds an Article 4 direction on houses in multiple occupation. If the room is meant to be let separately, start from our HMO conversion drawings in Southwark instead.

Southwark's figures, and why they are only a guide

Across every kind of home improvement Southwark decided 558 householder applications in its latest year and granted 94.8 per cent. It met the eight-week clock, or an agreed extension, for 95.3 per cent. A rate that high covers rear extensions, lofts and porches alike, so it says little about a garage front.

The levy is easier to state. Southwark charges £598/m² (Zone 1); £300/m² (Zone 2); £74/m² (Zone 3) on new residential floor area, and a conversion inside the existing walls creates none, so the charge does not normally reach this kind of job.

A cold slab, a thin wall and a fixed fee

An old garage floor is usually bare concrete, often set lower than the house, and the walls may be one brick thick. For a room people will sleep in, new elements are limited to: New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4. We test the build-up against the surveyed levels and tell you what it takes off the ceiling height, so there is no argument with the builder after the slab is down.

The set costs £695, VAT included and quoted before work starts. A second MCIAT technologist checks each sheet, and the pack for building control is our building regulations drawings in Southwark.

Compared with the boroughs either side

Fronts are judged differently across each boundary, so Lambeth, Lewisham and Tower Hamlets are worth comparing. For the borough as a whole see architectural drawings in Southwark; the general method sits on the garage conversion plans page.