A lawful development certificate consultant is a planning specialist who advises whether proposed or completed development is lawful under the Town and Country Planning Act 1990 and applies to the local planning authority for a Lawful Development Certificate (LDC). An LDC for proposed development confirms that what is planned will benefit from permitted development rights. An LDC for existing development confirms that the use or works have been in place long enough to be immune from enforcement action. An LDC is not a planning permission - it is a formal legal declaration of lawfulness.
What they do
- Assess whether proposed development falls within permitted development rights
- Prepare and submit LDC applications for proposed development (CLEUD/CLOPUD)
- Gather and present evidence for existing use and existing development LDCs
- Advise on permitted development rights removed by Article 4 directions
- Assess the 4-year and 10-year enforcement time limits
- Appeal against refusals of LDC applications to the Planning Inspectorate
- Advise on the conditions attached to permitted development rights
- Produce lawfulness opinions for conveyancing and property transactions
- Advise on prior approval requirements under the GPDO
When you need one
An LDC consultant provides legal certainty before building work starts and reassurance for buyers and lenders when selling property with unverified development.
Typical costs (UK, 2025)
| Job type | Typical cost |
|---|---|
| LDC advice and assessment | £500 - £1,000 |
| LDC application preparation | £600 - £1,800 |
| Evidence gathering and report | £400 - £1,000 |
| LDC appeal (written representations) | £1,500 - £4,000 |
| Completion certificate review | £200 - £500 |
| Hourly rate | £75 - £130 / hr |
LPA application fees are payable separately (currently £234 for householder proposals in England). Evidence gathering for existing use LDCs can add significant cost depending on the age and complexity of the development.
Frequently asked questions
What is a Lawful Development Certificate?
A Lawful Development Certificate is a legal document issued by the local planning authority confirming that a proposed or existing development is lawful - either because it benefits from permitted development rights, or because the time limit for enforcement action has passed and the development is immune from enforcement.
When does development become immune from enforcement?
For a change of use or breach of condition the time limit is 10 years. For other operational development (building work) the time limit is 4 years. After these periods the LPA cannot take enforcement action and an LDC can confirm the development is lawful.
Is an LDC necessary if I am confident I have permitted development rights?
An LDC is not legally required but is strongly recommended before building work starts. It provides certainty and avoids disputes when selling. Many solicitors and mortgage lenders require an LDC for permitted development extensions carried out without building regulations approval.