A Lawful Development Certificate, often called an LDC, can be used to confirm whether proposed or existing works are lawful in planning terms. It is not the same as planning permission, but it can provide formal written confirmation from the council that the works or use described in the certificate are lawful.

​

There are two main types of lawful development certificate:

​

• Proposed lawful development certificate — used before work starts, usually to confirm that planning permission is not required.

• Existing lawful development certificate — used where works, a use, or a breach of condition has already happened and the owner wants formal confirmation that it is lawful.

​

A lawful development certificate can be useful for:

​

• House extensions

• Loft conversions

• Garage conversions

• Garden buildings

• Outbuildings

• Replacement windows

• Solar panels

• Roof alterations

• Porches

• Sheds and ancillary buildings

• Existing works completed without formal planning approval

• Older changes of use

• Properties being sold or remortgaged

• Projects where the homeowner wants written confirmation before starting work

​

​

Ask PAS About Lawful Development Certificate Plans and Drawings

 

The drawings are one of the most important parts of a lawful development certificate application. The council needs to understand exactly what exists, what is proposed and why the works are considered lawful.

​

Planning Application Services (PAS) can prepare lawful development certificate plans and drawings for homeowners who need to show:

​

• What the property looks like now

• What works are proposed

• The size, position and scale of the development

• The relationship to boundaries and neighbouring properties

• Whether the proposal fits within permitted development limits

• Whether the works are already complete

• What evidence supports an existing lawful use or development

• Whether the project should be submitted as a proposed or existing lawful development certificate

​

PAS can prepare drawings for:

​

• Existing floor plans

• Proposed floor plans

• Existing elevations

• Proposed elevations

• Roof plans

• Site location plans

• Block plans

• Section drawings where needed

• Garden or site layout drawings

• Marked-up drawings to explain existing or proposed works

• Supporting plans for permitted development assessments

​

​

Proposed Lawful Development Certificates

 

A proposed lawful development certificate is commonly used where a homeowner wants confirmation before starting work.

​

This may be helpful where:

​

• You believe the project is permitted development

• You want written confirmation before building starts

• A builder, lender, buyer or solicitor wants formal evidence

• The project is close to permitted development limits

• The council may need drawings to confirm the position

• You want to avoid uncertainty before spending money on construction

​

A proposed lawful development certificate package may include:

​

• Existing drawings

• Proposed drawings

• Site location plan

• Block plan

• Roof plan where needed

• Measurements and area calculations where relevant

• Notes explaining why the proposal is lawful

• Supporting permitted development information

• Application submission support

​

​

Existing Lawful Development Certificates

 

An existing lawful development certificate is used where works or a use already exist and the owner wants formal confirmation that the position is lawful.

​

This can be useful where:

​

• Building work was completed some time ago

• A garage, loft, outbuilding or extension already exists

• A property has been used in a certain way for a long period

• A planning condition may have been breached

• A buyer, solicitor or lender is asking for evidence

• The property is being sold or refinanced

• You want to regularise the planning position without applying for retrospective planning permission

​

An existing lawful development certificate may need stronger evidence, such as:

​

• Existing plans and elevation drawings

• Current photographs

• Historic photographs

• Aerial images where available

• Utility bills or council tax records

• Tenancy records or occupation evidence

• Invoices or building records

• Dated correspondence

• Statements or statutory declarations where appropriate

• A written explanation of the planning history and timeline

​

​

What a Lawful Development Certificate Package May Include

 

The exact information depends on the project, but a typical package may include:

​

• Site location plan

• Block plan

• Existing drawings

• Proposed drawings

• Elevation drawings

• Roof plans where needed

• Section drawings where useful

• Photos of the property

• Supporting planning notes

• Permitted development assessment notes

• Evidence schedule for existing works or use

• Application form support

• Submission support through the Planning Portal

​

A clear drawing and evidence package gives the council the information it needs to assess the application properly.

​

​

Why Professional Support Helps

 

Lawful development certificate applications are often technical. The council is not simply deciding whether it likes the proposal; it is deciding whether the works or use are lawful in planning terms.

​

Professional support can help you avoid:

​

• Applying for the wrong type of certificate

• Submitting unclear or incomplete drawings

• Failing to provide enough measurements

• Missing relevant permitted development limits

• Failing to explain the planning history

• Providing weak evidence for existing works or use

• Confusing a lawful development certificate with planning permission

• Delays caused by council requests for clearer information

• Problems during a property sale because the certificate was not properly prepared

​

PAS can help prepare the drawings, application information and supporting evidence so the council can understand the case clearly.

​

​

Full-Service Support from PAS

 

PAS can provide support from the first planning check through to the lawful development certificate submission and next steps.

​

This may include:

​

• Initial project review

• Proposed lawful development certificate support

• Existing lawful development certificate support

• Plans and drawings

• Site and block plans

• Elevation drawings

• Roof plans and sections where needed

• Supporting planning notes

• Evidence review for existing works

• Help responding to council queries

• Planning application support if an LDC is not the right route

• Building Regulations drawings where the project moves forward

• Structural design coordination where required

• Party wall advice and services where needed

​

A lawful development certificate can be very useful where you want certainty before starting work, or where you need to confirm the planning position for works that already exist.

​

​

Get expert help with your lawful development certificate

 

Whether you need plans, drawings, evidence support, a proposed lawful development certificate, an existing lawful development certificate or advice on whether a full planning application is needed, Planning Application Services (PAS) can help you understand what is needed and provide a clear quote for the right level of support.

​

Tell us what you are planning, send any photos, sketches, existing drawings or property records you have, and we can advise on the next steps.