Lewisham, London
Garage conversion plans in Lewisham
Garage conversion plans for a Lewisham house start at £695 including VAT. The borough has 57 Article 4 directions, and a garage front is exactly the kind of detail they can cover, so we check the map for your road before any design work begins.
From £695 (VAT included)
- MCIAT chartered
- £2m PI insured
- LABC Partnered
- Fixed fees, VAT included
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Garage conversion plans in Lewisham and the Alterations and Extensions SPD
Lewisham's guidance for changing a house is the Alterations and Extensions SPD, used alongside the Lewisham Local Plan 2020-2040. We found no figure in it that applies only to garages. The document still sets the standard for a front elevation, and a garage conversion is judged mainly on how the new wall and window sit against the house and the rest of the road.
Housing in the borough is varied. 42.2 per cent of households live in a house, and the rest live in flats. The sort of house you own changes the advice: a semi with a drive and a garage beside the front door is the easiest case, a terrace with a ground-floor garage under a bedroom is harder.
We therefore begin with a site photograph and a measure of the garage opening before we propose a window pattern.

Local figures for Lewisham
| Measure | Value | Period | Source |
|---|---|---|---|
| Households living in a house | 42.2 % of households living in a house or bungalow (detached, semi-detached or terraced) | Census 2021 | nomisweb.co.uk |
| Owner-occupied households | 41.9 % of households owner-occupied (owned outright or with mortgage/loan) | Census 2021 | nomisweb.co.uk |
| Article 4 directions | 57 Article 4 directions published by the council | — | planning.data.gov.uk |
| Article 4 direction areas | 89 Article 4 direction area polygons published by the council | — | planning.data.gov.uk |
| Conservation areas | 30 named conservation areas published by the council | — | planning.data.gov.uk |
| Listed building entries | 367 list entries (Historic England, within the LPA boundary) | — | planning.data.gov.uk |
| worldHeritageSites | 1 World Heritage Sites intersecting the LPA boundary | — | planning.data.gov.uk |
| Householder applications granted | 89.4 % | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications decided in time | 95.2 % decided within 8 weeks or an agreed extended period | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Average price, terraced | 602,116 GBP | 2026-07 | publicdata.landregistry.gov.uk |
| Supplementary planning document | Alterations and Extensions SPD | 2019 | lewisham.gov.uk |
| Local plan | Lewisham Local Plan 2020-2040 | — | lewisham.gov.uk |
| Planning application search | https://planning.lewisham.gov.uk/online-applications/ | — | lewisham.gov.uk |
| TCPA 1990 s55(2)(a) | Works affecting only the interior, or not materially affecting external appearance, are not development | — | legislation.gov.uk |
| Class A, condition A.3(a) | Exterior materials must be of similar appearance to the existing house (conservatories excepted) | — | legislation.gov.uk |
| Householder: alterations/extensions to a single dwellinghouse, from 1 Apr 2026 | 548 GBP | — | ribblevalley.gov.uk |
A blank value means the figure has not been published, not that there are none. Check your own address with the council.
Building regulations, layer by layer
The Approved Documents that shape most house projects, from structure to the application itself.
- A · Part A: structure
- Approved Document A: Structure, 2004 edition incorporating 2004, 2010 and 2013 amendments
- B · Part B: fire safety
- All dwellings: fire detection and alarm system minimum Grade D2 Category LD3 (BS 5839-6), mains-operated smoke alarms to BS EN 14604
- C · Part L: insulation
- 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
- D · Part K: stairs
- 2.0 m clear headroom over stairs
- E · Full plans application
- Building control body must decide a full plans application within 5 weeks, or longer if agreed in writing
Article 4 directions and heritage in Lewisham
The national planning data service records 57 Article 4 directions here, mapped across 89 areas, and the council publishes 30 conservation areas. Where a direction applies, the right to change a front wall or openings without an application may be removed.
Historic England lists 367 entries inside the boundary, and 1 World Heritage Site touches the boundary. A listed house, or a house in the setting of one, needs careful treatment of every external change.
A garage may stand on the boundary, with a neighbour's wall or a shared drive alongside. Where we touch or underpin that wall, the Party Wall etc. Act 1996 may require notice to the neighbour, and we flag it on the drawings so it is not discovered by the builder. None of this means a conversion is unlikely to succeed. It means the drawings must show their working: the existing front, the proposed front, and the materials, in one clean sheet.
Planning route for a Lewisham garage
The starting rule is generous: Works affecting only the interior, or not materially affecting external appearance, are not development. A garage kept as a garage from the street can often be converted without an application. Replace the door with a window and the materials condition comes into play: Exterior materials must be of similar appearance to the existing house (conservatories excepted).
Where the position is clear, we make a lawful development certificate in Lewisham application, and when the front is protected we prepare the householder application from our planning drawings in Lewisham. The council's fee for that application is £548, paid directly to the council.
We also look at the original planning permission for the house. Some estates were approved on the basis that garages stay free for parking, and a surviving condition is best found early.
Lewisham's householder decisions and local values
Lewisham granted 89.4 per cent of its householder applications in the latest published twelve months, and 95.2 per cent were decided inside eight weeks or an agreed extension. Those numbers cover all domestic schemes, so we use them to plan time rather than to predict a result.
A terraced home in the borough averages £602,116, and 41.9 per cent of households own their home, so an owner-occupier will live with the result and the street view.
You can look up your own road before you instruct anyone. The council's planning register at https://planning.lewisham.gov.uk/online-applications/ lets you search by address, and the decision notice for the original house or for a neighbour's garage conversion shows which conditions and which materials the officers accepted. Bring what you find to us and we will build it into the brief, so the design follows precedent on your own street and not a generic pattern.
What your Lewisham garage set contains
Each set shows the garage as it is and as converted, with plan, front and rear elevations and a section through the slab and wall. The section carries the detail that turns a garage into a room: a new floor build-up, a lined wall and the damp-proofing, all dimensioned for the builder.
The fee is £695, VAT included and fixed before work starts, with a second chartered technologist checking every sheet and free redraws if the council asks for changes. For the structure and thermal detail building control reviews, see our building regulations drawings in Lewisham.
Garage conversion plans near Lewisham
Across the borough boundaries, see garage conversion plans in Greenwich, garage conversion plans in Bromley or garage conversion plans in Southwark. The full local picture is at architectural drawings in Lewisham, and the garage conversion plans service page explains the work in general.
What you receive


Related pages
Other services in Lewisham
Questions
Do Lewisham's Article 4 directions stop garage conversions?
No, they change the route. Where one applies, altering the front may need an application. We check your address against the council's directions first.
Which Lewisham guidance applies to a new garage front?
The Alterations and Extensions SPD, with the Lewisham Local Plan 2020-2040.
How much are garage conversion plans in Lewisham?
From £695 including VAT, fixed before we start. A householder application fee of £548 is separate if one is needed.
Can I keep the garage door and just use the space inside?
Often, yes. If the outside stays as it is, the work may not be development at all, though a planning condition or a lease could still stop it.
Sources and dates
- nomisweb.co.uk, retrieved
- nomisweb.co.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- publicdata.landregistry.gov.uk, retrieved
- lewisham.gov.uk, retrieved
- lewisham.gov.uk, retrieved
- lewisham.gov.uk, retrieved
- legislation.gov.uk, retrieved
- legislation.gov.uk, retrieved
- ribblevalley.gov.uk, retrieved
- gov.uk, retrieved
- gov.uk, retrieved
- gov.uk, retrieved
- gov.uk, retrieved
- legislation.gov.uk, retrieved
- Contains public sector information licensed under the Open Government Licence v3.0.
- Contains OS data © Crown copyright and database right 2026.
- Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
- Contains Historic England data © Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.

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