Garage conversion plans in the City of London

Who owns the bay: leases, freeholders and consent

Only 2 per cent of City households live in a house or bungalow, and domestic gardens take up 0.1 per cent of the land. The typical City garage is therefore a numbered bay in a shared car park, held on a lease from a freeholder. Householder permitted development belongs to houses, so the shortcut open to a suburban owner is closed here.

Paperwork comes first. Send the lease and the title plan and we read them for three answers: whether the space is yours to alter, whether living use is permitted, and which party must consent, the landlord, the managing agent or both. We cannot give that consent, but we can prepare the drawings they will ask to see, and that usually shortens the exchange.

What the City's decision figures can and cannot tell you

In its latest published year the City decided 1 householder application, granted 100 per cent and decided 100 per cent in time. One case predicts nothing about yours, and we do not lean on it.

Certificates give a larger sample. The council handled 16 certificate applications in the latest statistics year, so a Lawful Development Certificate in the City of London is an established way to put the council's view of an internal fit-out in writing. A lease term or a listing can still demand its own consent afterwards.

Planning on the inside and the outside of a bay

The national position is that Works affecting only the interior, or not materially affecting external appearance, are not development. A bay fitted out as a room with nothing altered externally may need no application. A new louvre, window or replaced shutter alters that, and the council's route then runs through our planning drawings in the City of London, with the heritage reasoning set out for the case officer in plain terms.

Fire, escape and detection in a room inside a block

Making a store habitable brings Building Regulations in whatever the planning answer. Inside a block the fire questions weigh most: escape routes, separation from the flats next door and the alarm system. The detection standard reads: All dwellings: fire detection and alarm system minimum Grade D2 Category LD3 (BS 5839-6), mains-operated smoke alarms to BS EN 14604.

Our building regulations drawings for the City of London gather these points on one set and flag where the freeholder's own engineer or fire strategy has to be involved before a builder prices anything.

Light, damp and air below street level

Many City bays sit below ground, and that shapes the room more than the heritage rules do. Walls and floors in contact with soil need a proper damp-proofing strategy, and a basement room has no windows to dilute the air, so mechanical ventilation usually goes in from the start. We show the tanking or membrane, the sump or drain position and the extract route on the technical sheets, with the duct run drawn to an outlet that the freeholder can accept.

Natural light is the other limit. A lightwell, a rooflight over a podium or a glazed door onto a courtyard each need the freeholder's agreement, and each affects the escape route. We draw two or three versions of the layout against those constraints so the lease conversation starts from a picture, not a description.

What to send and what comes back

Please send the lease, the title plan, any listing entry and a few photographs of the bay. We survey to one datum, draw layout options and agree the choice with you in writing. Sheets normally follow about a week after the survey, each checked by a colleague who did not draw it. The fee is £695, VAT included, fixed before you commit, and amendments the council asks for are redrawn without charge.

For the whole square mile see architectural drawings in the City of London. Across the boundary are garage conversion plans in Westminster, Tower Hamlets and Islington, and the garage conversion plans overview covers the national rules.