Lawful development certificates: written proof that no planning application was needed
By the Offrano editorial team · · 4 min read
Permitted development lets many extensions, loft conversions and outbuildings go ahead without planning permission. The catch is that nobody hands you a document saying so. If a neighbour complains, a buyer's solicitor asks, or the rules turn out to be more complicated than they looked, 'we thought it was permitted development' is not much of an answer. A lawful development certificate from the council is. This guide explains how certificates work in England and when one is worth having.
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Two kinds of certificate
The law provides two types. One confirms that an existing use or development is lawful for planning purposes, under section 191 of the Town and Country Planning Act 1990. The other confirms that a proposed use or operation would be lawful, under section 192. For homeowners planning work under permitted development, the second, for proposed development, is the relevant one.
Anyone can apply to the local planning authority, and the council grants a certificate if it is satisfied that the legal tests are met. The application needs enough factual information and evidence for a decision, along with the relevant fee.
Source: gov.uk · legislation.gov.uk
What a certificate for proposed work gives you
Once a certificate for proposed development is granted, work carried out in accordance with it is presumed lawful, unless there is a material change before the work begins. Guidance gives two examples of such a change: an Article 4 direction that removes the relevant permitted development right, or a change in the law on permitted development rights.
That last point matters at the moment. Permitted development rules for some works, including solar panels and heat pumps, have been amended in England recently. A certificate reflects the rules at the time of the decision, so it is worth starting work within a reasonable time of receiving it.
Source: gov.uk
When it is worth applying
- a loft conversion or rear extension close to the permitted development limits
- a house that has been extended before, where earlier additions count towards the limits
- properties where it is unclear whether an Article 4 direction applies
- outbuildings whose use might be questioned, such as a garden room used as an office
- a planned sale within a few years, where a buyer will ask for evidence
- a neighbour who has already raised objections
Certificates for existing development
The other type helps where something already exists without planning permission and you need to show it is now lawful, typically before a sale. For existing use, the council considers the applicant's evidence and any evidence against it; if nothing makes the applicant's version less than probable and the evidence is precise and unambiguous, guidance says there is no good reason to refuse. Statutory declarations, photographs, council tax records and invoices are typical evidence.
Timing rules decide when unauthorised development becomes immune from enforcement, and they have changed in recent years. Take advice from a planning professional before relying on the passage of time.
Source: gov.uk
What a certificate does not cover
A lawful development certificate is only about planning law. It does not remove the need to comply with the Building Regulations, listed building controls or other licensing and permitting schemes. A loft conversion that is lawful in planning terms still needs Building Regulations approval, and the Party Wall Act may apply as well.
In Scotland and Wales, similar certificates exist under their own planning law, with different forms and rules. Check with your council.
Source: gov.uk
Planning the timetable
A certificate takes weeks, not days, and builders and designers usually prefer to have it before committing to a start date. Many architectural designers prepare the drawings for the application as part of their service. Ask at the quote stage who applies and whether the fee is included.
Prepare the application the way a careful council officer will read it: scaled drawings of the existing and proposed house, measurements showing how the limits are met, a note of any earlier extensions and their dates, and a clear description of the use of any outbuilding. Gaps lead to requests for more information and delay. If the council refuses a certificate for proposed work, it has decided that the work would need planning permission, and you can then apply for permission or appeal.
If you would like a quote for an extension or loft conversion, our request form goes to exactly one builder in your area, the one that buys it; we email you who it is before your details are shared, and the request is free.