Certificates of lawfulness for works to a listed building
Section 26H of the Planning (Listed Buildings and Conservation Areas) Act 1990 lets you establish formally that described works need no listed building consent. The application turns on the precision of the schedule.
A certificate of lawfulness of proposed works is the formal way to establish that a specific job on a listed building does not need listed building consent. It sits in section 26H of the Planning (Listed Buildings and Conservation Areas) Act 1990, inserted by the Enterprise and Regulatory Reform Act 2013, and it answers one question only: would the works described affect the character of the building as a building of special architectural or historic interest? If the council is satisfied they would not, it must issue a certificate, and the works can proceed without consent.
The reason to use it is liability. Carrying out unauthorised works to a listed building is a criminal offence under section 9 of the same Act, and a verbal assurance from a conservation officer protects nobody.
What the certificate confirms
The certificate is a statement about a described set of works, at a stated building, on the date it is issued. It is not a general clearance for a project, and it does not make the works lawful in any other respect. Building regulations approval, planning permission for anything that amounts to development, and any other consent still apply.
Two limits are worth being clear about from the start. The certificate covers proposed works, so it cannot be used to regularise something already done. And it is tied to the description, which means a certificate for replacing a rotten cill in kind gives you nothing if the carpenter then replaces the whole window.
When it is worth applying
Most works to a listed building fall into one of three groups. Plainly consentable alterations, where you apply for consent and argue the heritage balance. Plainly trivial maintenance, where nobody sensible applies for anything. And a middle band where reasonable professionals disagree, which is where the certificate earns its place.
The middle band usually looks like one of these:
- like for like repair where the replacement material or technique differs slightly from the original
- removal of a modern, non-original element such as a 1970s partition, suspended ceiling or later shopfront fascia
- reinstatement of a lost feature based on physical or documentary evidence
- servicing works with visible consequences, such as re-routeing pipework in a historic room
- works to a curtilage structure whose listed status is arguable
A certificate also has commercial value. Funders, purchasers and insurers accept a certificate where they will not accept a note of a telephone conversation, and on a portfolio of listed assets it makes a repair programme far easier to administer. Where the works do turn out to affect character, the conversation moves to consent and the Heritage Statement that supports it.
Describing the works precisely
The application succeeds or fails on the description. Write it as a schedule, item by item, room by room, with a drawing or photograph reference against each item, and state the material, the technique and the extent for each.
Compare two versions of the same item. "Repair windows to rear elevation" invites refusal, because it could mean anything. "Window W4, rear elevation first floor: splice new seasoned oak into the lower 150 millimetres of the outer cill using a scarf joint, retain all existing glazing, retain frame and sashes, finish with linseed oil paint to match existing" can be assessed on its face.
Where an item involves opening up, say so and say what happens next. A schedule that acknowledges the possibility of finding earlier fabric behind a partition, and commits to stopping and consulting, reads as competent rather than evasive.
Evidence to submit
Keep the pack proportionate but complete:
- A location plan and floor plans marking each item of work.
- A schedule of works with materials, techniques and extents, cross-referenced to drawings.
- Photographs of every element affected, dated, with a scale where the detail matters.
- A short statement of significance for the building and above all for the specific elements being worked on.
- Evidence of the date of any element you say is modern, such as a photograph from an earlier date, a previous consent, or a description in the list entry.
- A reasoned conclusion on why the character of the building as a building of special interest is unaffected.
The statement of significance is where applications are won. Historic England's advice on managing significance in decision taking sets out how to identify the heritage interest of a building and its parts, and an application that shows the element being altered carries no special interest is far stronger than one asserting the works are minor. Our note on internal alterations that harm significance covers the other side of the same judgement.
Fees and determination
The council determines the application; there is no fee for listed building consent applications, and applications under section 26H are also handled without a planning fee, but check the current fee schedule and the council's own guidance before you submit, because published requirements change. The determination period runs in the same way as a consent application, so allow eight weeks and do not programme the works to start earlier.
Councils differ in how they handle these. Some treat them as a conservation officer desktop exercise. Others consult in the same way as for consent. Ask at the point of submission which route yours follows, because that changes how much detail is worth providing up front.
Effect of a positive certificate
Once issued, the certificate means those works do not require consent, and the section 9 offence does not bite for what is described. Keep it with the building's records, along with the photographs and the schedule, because the value of the certificate is in proving later what was actually authorised. Where works are recorded as they proceed, the record is better still, as our piece on recording a building before demolition or conversion explains.
If the works change on site, the certificate stops covering them. A short supplementary application for the changed item is cheaper than the alternative.
What to do if the council refuses
A refusal is not a finding that the works are unlawful. It is a statement that the council is not satisfied the character would be unaffected. The practical routes are to narrow the schedule and reapply, or to apply for listed building consent for the items in dispute and argue the heritage balance under sections 16 and 66 of the Act, as discussed in our note on what sections 66 and 72 require of decisions.
Do not treat silence as agreement. There is no deemed approval for a certificate of this kind, and starting the works while the application sits undetermined carries the same criminal exposure as never applying.
One honest uncertainty: these certificates are used far less than they should be, so practice varies between authorities and some conservation teams are unfamiliar with them. A short pre-application conversation, framed around the schedule rather than the principle, usually sorts that out.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. If you need the supporting heritage documents drafted quickly, browse the report types by category to see what PlanScope produces. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
What is a certificate of lawfulness of proposed works?
It is a certificate under section 26H of the Planning (Listed Buildings and Conservation Areas) Act 1990 confirming that described works to a listed building would not affect its character as a building of special architectural or historic interest, and so need no listed building consent. It applies only to the works described in the application.
Can it cover works already carried out?
No. The certificate deals with proposed works only, so it cannot regularise anything already done. Where unauthorised works have taken place, the routes are a retrospective application for listed building consent or, in some circumstances, reliance on the statutory defence, and both should be discussed with a specialist before approaching the council.
Is there a fee?
Listed building consent applications carry no planning fee, and applications under section 26H are handled in the same way, but published fee schedules change and some councils charge for pre-application advice around them. Check the current schedule and the council's own guidance before submitting rather than relying on an older figure.
How long does a decision take?
Allow eight weeks from validation, in line with a listed building consent application, and longer where the council chooses to publicise or consult on it. There is no deemed approval if the council fails to decide, so do not programme works to start on the assumption that silence means agreement.
What happens if the certificate is refused?
Refusal means the council is not satisfied that character would be unaffected, not that the works are unlawful. In practice you either narrow the schedule and reapply, or apply for listed building consent for the disputed items and argue the heritage balance. Take advice before carrying out anything in the meantime, because section 9 creates a criminal offence.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.