How Much Do Garage Conversion Drawings Cost in Orpington?

Whether you need planning permission in Orpington usually comes down to one document: the planning permission your house was built under. Find that first, and the rest of the job is straightforward.

Do I need planning permission to convert a garage in Orpington?

Often not. Internal works are not generally development, so turning the inside of an attached garage into a room needs no planning permission (MHCLG guidance). Replacing the garage door with a wall and window is an external change, but on most houses it falls within ordinary householder permitted development.

The exception is a house where those rights have been taken away. Councils can remove permitted development rights through a planning condition or an Article 4 direction, and the restriction depends on the exact wording (MHCLG guidance). Our garage conversion guide covers the national rules in full.

How do I know if a Bromley condition protects my garage?

Bromley has a standard condition for this. In a 2019 committee report pack, it reads that parking spaces and garages shall be completed as approved and "thereafter shall be kept available for such use", with no permitted development allowed that would stop that. The stated reason is to comply with Policy 30 of the Bromley Local Plan and to avoid development without adequate parking, which is likely to lead to parking inconvenient to other road users (Bromley Plans Sub-Committee No. 4, 20 June 2019).

Conditions like this sit on the permission for newer houses and estates, and on extensions that created or rebuilt a garage. An interwar Orpington semi with its original garage is less likely to carry one, but a later extension at the side may have added it. We search Bromley's planning register for every permission on your address before drawing anything.

If a condition applies, you have two routes. A planning application for the conversion, which will be judged against Bromley's parking policy, so it helps to show the drive still takes a car. Or an application to vary or remove the condition. Either way, the drawings need the drive dimensions, which we take on the survey.

If no condition applies, a certificate of lawfulness confirms the conversion is lawful, which a buyer's solicitor will want later. Our certificate cost post explains the fee and timing.

What changes in Petts Wood or the Orpington conservation areas?

Less than people expect for a garage. Bromley's Local Plan lists Broomhill and The Priory in Orpington, and Chislehurst Road, Station Square and The Chenies in Petts Wood, among its conservation areas (Bromley Local Plan, paragraph 10.16). Inside them, an internal conversion is still not development, but the change to the front wall is judged more closely, because it shows on the street. A window that matches the house's existing ones, in brick to match, is the design that gets through.

The Petts Wood Area of Special Residential Character carries an Article 4 direction from 19 July 2022 removing rights for roof extensions and roof alterations (Bromley Council). That direction does not touch a garage conversion. It matters only if you also plan to raise the garage roof or add rooms above it, which then needs a full application.

What does Bromley need if an application is required?

If a condition or the conservation area means you must apply, Bromley's checklist applies in full. A biodiversity net gain exemption statement is mandatory on every application (Bromley validation checklist). Photographs must be taken within 30 days of submission and show all sides of the house and the front and rear street scenes (Bromley validation guidance). For a garage conversion, the front photograph does useful work: it shows the officer the drive and how many cars it holds once the garage has gone.

We add a simple parking plan to the drawings, with the drive measured and a car space drawn to scale, because that is the question Policy 30 asks.

What does building control need for a garage conversion?

Building regulations apply to every garage converted to a habitable room, whatever the planning position. Building control must have a building notice or a full plans application before work starts (Building Regulations 2010, regulation 12).

The drawings show how the conversion meets the regulations in the places garages usually fall short. The floor is often lower than the house and uninsulated, so it needs raising and insulating. The new front wall under the old door opening needs a foundation, which the original garage may not have. The walls need insulation and a damp-proof course, and the room needs ventilation and, where it opens off the hall, a safe route out in a fire. On a semi, the shared wall with the neighbour's garage also needs the sound and fire separation checked. Our Bromley building regulations page covers the local building control routes.

What does the fee cover, and what is extra?

The £675 fee covers the drawings. A planning application or certificate fee, if needed, is paid to Bromley. Structural calculations are needed only if a wall is removed or a beam is added, for example to open the garage into the kitchen. See our garage conversions page for what the service includes, our Bromley page for borough details, and our London garage conversion post for how other councils compare.

Frequently asked questions

My Orpington house was built in the 1930s. Is there likely to be a condition? Less likely than on a newer house, but check any later permission for a side extension or rebuilt garage. We search Bromley's records for every permission on the address.

Can I keep part of the garage as storage? Yes. A part conversion, with a store at the front behind the original door and a room behind, is common and avoids changing the front wall.

Do I need party wall notices? Sometimes. If the new floor or wall work cuts into a wall shared with the neighbour's garage, the Party Wall Act may apply.

Does a garage conversion need planning in Petts Wood? Not because of the Article 4 direction, which covers roofs. It may need planning if the house is in one of the Petts Wood conservation areas and the front changes, or if a condition applies.