Lawful Development Certificates for Loft Conversions
Application evidence · proposed elevationsMany house loft conversions can be built under Permitted Development, without a planning application — but only if every relevant limit and condition is met. A proposed Lawful Development Certificate gives you formal confirmation from your council that, on the information supplied, the work would be lawful. We check your property, prepare the drawings and submit the application.
Not included
The council's statutory application fee and any online service charge are paid by you. An LDC does not replace building regulations approval, which every habitable loft conversion needs. Party wall matters are separate.
What you receive
- Check of Permitted Development limits for your property
- Measured survey
- Existing and proposed drawings
- Location and block plans
- Application forms prepared and submitted
- Liaison with the planning officer
How it works
- 01
Property check
We look at your house, location and planning history to assess the likely route.
- 02
Survey & drawings
We measure up and prepare the LDC drawings and submission in approximately 1–2 weeks.
- 03
Application
We complete the forms, confirm the fee with you and submit to the council.
- 04
External review
The council considers the application on its own timetable; we respond to officer queries.
What an LDC is — and isn't
A certificate of lawfulness of proposed use or development (often called a proposed LDC) is a formal decision by your local planning authority. It confirms that the proposed work would be lawful based on the drawings and information submitted. It is not the same as planning permission. The council isn't judging whether it likes the design; it's deciding whether the proposal falls within the rules. That's why the drawings and details submitted need to be accurate — the certificate only covers what is shown.
When a loft can be Permitted Development
For houses in England, loft conversions can often be carried out under Permitted Development when the relevant conditions are met, including: • Staying within the volume allowance for the house type, taking account of earlier roof extensions • No enlargement on the roof slope facing the highway at the front • Not exceeding the height of the existing roof • Materials similar in appearance to the existing house • Side-facing windows obscure-glazed and non-opening below a set height • No verandas, balconies or raised platforms The full rules have more detail, and we check them against your specific property.
Not sure which conversion suits your loft?
We’ll assess the roof and explain what the space can realistically deliver.
When the position changes
Some situations need checking case by case, and may mean Permitted Development doesn't apply: • Conservation areas and other designated land • Article 4 directions removing householder rights — common in parts of London • Flats and maisonettes, which don't have householder Permitted Development rights • Previous roof extensions or alterations that have used up volume • Conditions on earlier planning permissions that removed rights If Permitted Development isn't available, a householder planning application is the usual alternative — see our planning drawings service.
Fees and timescales
In England, the statutory fee for a proposed Lawful Development Certificate is generally half the equivalent full planning application fee. Fees change, and an online submission service charge may apply. We confirm current fees before submitting; they are paid by you and separate from our fee. After the survey, we prepare the LDC drawings and submission in approximately 1–2 weeks. Where the project scope is suitable, Building Regulations drawings and structural calculations can be prepared within that same 1–2 week design period. Council and building-control review periods are external and can vary.
Frequently asked questions
01What is a Lawful Development Certificate for a loft conversion?
A certificate of lawfulness of proposed use or development is a formal decision from your local planning authority confirming that, on the information supplied, the proposed loft conversion would be lawful — usually because it falls within Permitted Development. It is not planning permission.
02Is an LDC compulsory?
No. If the work genuinely is Permitted Development you don't have to apply. Many homeowners do, because it gives formal evidence that is useful when selling or remortgaging, and it confirms the position before money is spent on the build.
03How much is the LDC application fee?
In England the statutory fee for a proposed Lawful Development Certificate is generally half the fee for the equivalent full planning application. Fees are set nationally and do change, and an online submission service charge may also apply. We confirm the current fee before submitting, and it is paid by you.
04How long does an LDC take?
We prepare the drawings and LDC submission in approximately 1–2 weeks after the survey. Council determination time is separate and varies by authority and workload; we do not control the decision period.
05Can every house loft conversion be Permitted Development?
No. Permitted Development only applies when all the relevant limits and conditions are met — including volume allowances, roof slope position, height and materials — and when rights haven't been removed. Conservation areas, Article 4 directions, flats and maisonettes, and previous extensions or conditions on earlier permissions can all change the position.
06What happens if the LDC is refused?
A refusal means the council doesn't consider the proposal lawful as submitted. Depending on the reason, the design can often be amended and resubmitted, or a householder planning application made instead. We'll talk you through the options.
Check your loft's planning route
Tell us about your property and we'll come back with the likely route and a fixed price.
Ready to plan your loft conversion?
Tell us about the property and receive a clear, fixed-price scope for the design stage.