Certificate of Lawfulness

At Plainview Planning, we prepare robust Certificates of Lawfulness to confirm whether existing or proposed uses and developments are lawful. From house extensions under permitted development to regularising long-standing uses, we provide clear, evidence-led applications that reduce risk and give certainty. Certificates of Lawfulness can be a valuable planning tool for confirming whether an existing or proposed use or development is lawful in planning terms. They provide certainty, help avoid potential enforcement action, and reduce the risk of legal complications further down the line.

The Two Main Types of Certificates

1. Certificate for an Existing Use or Development (Section 191)

This certificate demonstrates that a use or development has been in place long enough to become lawful through the passage of time. Historically, the time limits were:

4 years for unauthorised residential use or construction of a dwelling
10 years for commercial, agricultural, or general breaches of planning control

Important change: From 25th April 2024, the 4-year rule has been abolished. Now, all breaches of planning control—residential or otherwise—are subject to a 10-year enforcement period. This makes early advice even more critical, as the ability to regularise unlawful development has become significantly more restrictive.

2. Certificate for a Proposed Use or Development (Section 192)

This certificate is used to confirm that a planned project (such as a house extension, outbuilding, or change of use) falls within Permitted Development (PD) rights under the General Permitted Development Order.

It is especially useful for providing peace of mind before construction begins, avoiding disputes with neighbours or later enforcement issues.

Why Apply for a Certificate of Lawfulness?

Certainty that your development or use is legally protected;
A strong safeguard against future enforcement action;
Helpful evidence in property sales, mortgages, or lease agreements;
Confidence that your proposal falls within permitted development rights.

Certificates of Lawfulness FAQs

We know the rules around Certificates of Lawfulness can feel complex, especially with recent changes to enforcement periods. To help, we’ve answered some of the most common questions our clients ask. Whether you’re considering an application or just want clarity on the process, these FAQs should give you a clear starting point.

Not legally, no—but it is strongly recommended. Even if your extension or outbuilding is permitted development, a Certificate of Lawfulness provides formal confirmation from the council. This protects you against future disputes with neighbours, enforcement issues, or challenges when selling your property. It acts as proof that your works were lawful at the time of construction.
The statutory timeframe for councils to determine a Certificate of Lawfulness application is 8 weeks. However, timescales can vary depending on the local authority’s workload. Submitting a well-prepared, evidence-backed application helps avoid delays. In complex cases, early advice can ensure your application addresses potential issues before submission.
For an existing use or development (Section 191), evidence is key. This could include sworn affidavits, dated photos, utility bills, tenancy agreements, or business records. The aim is to prove continuous use for the relevant 10-year period. A weak or patchy evidence base risks refusal, so professional support is often crucial.
No. Once granted, a Certificate of Lawfulness is a permanent confirmation that your use or development is lawful, as long as the facts remain the same. This makes it particularly valuable when selling or mortgaging a property, as buyers and lenders often request proof of lawfulness.
Yes, but applications can be technical and evidence-heavy. A common reason for refusal is simply a lack of sufficient detail or incorrect interpretation of planning law. Working with a planning consultant ensures your submission is robust, comprehensive, and supported by relevant case law and policy.

How We Can Help

Certificate applications need to be thorough, accurate, and well-evidenced. At Plainview Planning, we can:

Assess whether a Certificate of Lawfulness is the right approach for your situation;
Review site history, aerial imagery, council records, and case law to support your case;
Review your evidence and prepare and submit robust applications to the local authority;
Provide a clear planning commentary alongside your supporting evidence or affidavits;
Advise on how recent changes to enforcement rules may affect your position.

Next Steps

If you’re unsure whether a Certificate of Lawfulness is right for you—or want to discuss how the 2024 rule changes might impact your site—get in touch with our team. We’ll provide practical, informed guidance based on the latest legislation and help you put forward the strongest possible case.

A team you can trust

Plainview Planning is an independent consultancy that has supported clients across England since 2008. We believe good planning starts with listening, and we take pride in offering clear, supportive advice. From homeowners and landowners to developers, farmers, and businesses, we think strategically to unlock site potential, achieve development goals, and build trusted relationships that last beyond each project.

Meet our team

Key Projects

Stunning new 600sqm home approved in the Cotswolds National Landscape

Innovative eco-development approved in the Green Belt, North Somerset

Architect-designed replacement dwelling, Tetbury

Residential regeneration in a landmark location – Ealing

Sensitive restoration and extension of a Grade II* listed home in Cheltenham

Successful pub diversification: 9 new homes and 22 letting rooms near Bath

Planning approved for new visitor facilites at an RSPB wetlands reserve

Change of use from pub to 31-Bed Hotel, London

Some of our clients

Below are some of the commercial clients and organisations we work with. You can view all our recent projects or read our latest news and updates.

I would not hesitate to recommend Plainview Planning. The worry was taken away from me, and I felt confident that my change of use application was all being dealt with in a professional manner.

Mrs Powis-Jones, Gloucestershire

Thank you for all your hard work on our situation. We achieved the best possible outcome thanks to your dedication and work ethic. Your pursuit of a positive outcome, despite what initially appeared to be a very poor prospect, was unwavering. The work and understanding from the beginning was strong and the goal was ultimately achieved We can only say that we would highly recommend Plainview Planning to future clients with the highest regard.

Mr Carlon, London

The Plainview Planning team have been fundamental in our retrospective planning permission application. They put together an application pack that was so thorough we received no further questions from the planning department, and the process was swift and painless. This is testament to Plainview Planning's understanding of the complexities of the planning process. I am deeply appreciative of their time and effort in bringing this to a successful conclusion.

Dr Bradbury, Essex

The team at Plainview Planning have provided superb support for our planning application for a new dwelling. They have provided deep expertise, great cross-functional working with our team of architects and consultants, creative solutions to potential barriers and been a pleasure to deal with as well! What more could you ask for?

Mr Lillie, Bristol

Thank you all for all that you did to achieve the planning permission. It is great that your experience and hard work - and indeed our nerves! - should be so rewarded. Onward and upward!

Mr & Mrs Colquhoun, Gloucestershire

Thank you for what was an outstanding level of professionalism and service that we received in our recent planning application. Without your knowledge and efforts against what was an extremely difficult planning authority, we would not have been successful in our application from annexe to annexe/holiday let. The planning consent granted was a hard-fought battle that you and the team helped us survive. There is absolutely no hesitation in recommending Plainview Planning to anyone.

Mr Griffiths, Essex

I was recommended to contact Plainview Planning by my architect. I was very pleased with the professional service I received. They were efficient, timely, listened to my feedback and answered my questions. I was delighted with the outcome, and my appeal was successful.

Mrs Thomas, Kent

When I finished reading your statement, I had a smile on my face. You made a complicated argument both simple and compelling - thank you.

Mr A Marler – Hertfordshire

I have been so impressed at the consistently high standard of work produced during my planning application and appeal process. The Plainview team went above and beyond what was required. A superb outcome, thank you.

Mrs Grimes, Suffolk

Thank you very much for your work on our application and it proves it again that it's worth hiring professionals, like you, to do the job.

Mr Sestokas, Essex

Just a few brief words to thank you for your much-needed contribution towards our recent planning approval. We had some stiff opposition. Nevertheless, you held us by the hand step by step - and you were proved right. I believe that by having Plainview Planning produce a planning statement, this was fundamental to our success - so well done. Best wishes to all the Plainview team.

Mr Morgan, London

Out of all the planning consultancies we approached for assistance, you were the most clued up.

Mr. Stanhope, Staffordshire

After a previously stressful experience we needed someone to 'hold our hands' and, for my part, to feel like someone cared about our forever home project as much as we did. Their professional approach & expert knowledge was combined with a genuine desire for us to succeed. I felt reassured and supported throughout and I wish we had known about Plainview Planning sooner. I would not hesitate in recommending you to anyone considering a self-build.

Mrs Johnson, Hertfordshire

On behalf of PKL Group and our client, I would like to take the opportunity to thank the team at Plainview Planning for undertaking such a sterling job in obtaining planning permission on what has been an incredibly complex and sensitive project. We would have absolutely no hesitation in returning to Plainview Planning for future outsourced planning support and I would equally have no hesitation in recommending their service to others.

PKL Group Ltd, Cheshire

Thank you for helping us with our appeal. The difference this has made to our lives is amazing. I would highly recommend Plainview Planning to anyone I know, who finds themselves in a similar situation.

Mrs Shergold, Essex

Plainview Planning made a realistic appraisal of a very complicated planning history of our annex. From the outset, our consultant clearly had good knowledge and skills to prepare the planning statement. Realistic but supportive throughout and made a stressful application easier for us. Successful outcome very much due to our consultant.

Mr & Mrs Cooper, East Sussex

Thank you so much for all your help!

Anytime Fitness, Camden

Faced with a sudden requirement to obtain “Certificates of Lawful Use”, I chanced upon Plainview Planning. A short time later I had a “face to face” meeting to establish an initial rapport and left with a warm feeling of confidence. The project was brought to fruition on time, under budget, and in a most efficacious manner. Communication was first class. Friendly and supportive. Plainview Planning demonstrated professionalism, understanding and commitment to achieve a positive result.

Mr Guignard, London

Plainview Planning are a professional team: they listen to what is being asked of them, then discuss and advise the route to take. They communicate in a timely fashion and there was never need for me to contact or chase them.

Mrs Taylor, Hampshire

I cannot recommend the Planview Planning team enough. They have supported us through the highs and lows of the process with compassion and professionalism. They are incredibly knowledgeable and have insights into the local area and process, are consummate professionals and above all are genuinely good, nice people. If you are reading this and need support / advice do not look any further. Thank you all for everything.

Mrs. Seymour, Essex