Do I Need Listed Building Consent?

Listed Building Consent (LBC) is a separate consent from planning permission, granted under the Planning (Listed Buildings and Conservation Areas) Act 1990. You can need Listed Building Consent, planning permission, both, or neither, depending on the works — they are assessed against different tests.

What triggers the need for consent?

Consent is required for any work of demolition, alteration or extension that would affect the building's character as a building of special architectural or historic interest. This is a broad test. It covers obvious external changes such as new windows, extensions or roof alterations, but it also covers internal work — removing a historic partition wall, replacing an original staircase, or altering historic joinery — where that fabric or arrangement contributes to the building's special interest. It also extends to any object or structure fixed to the building, and, in many cases, to structures within its curtilage that were in existence before 1 July 1948, treated as part of the listing.

Is it really a criminal offence to carry out unauthorised works?

Yes. Under section 9 of the Planning (Listed Buildings and Conservation Areas) Act 1990, it is a criminal offence to carry out, or cause to be carried out, works to a listed building that would require consent, without first obtaining it — or to breach a condition attached to a consent that has been granted. On summary conviction the court can impose imprisonment for up to six months, a fine, or both, and in setting any fine the court must specifically take into account any financial benefit the offender gained from the unauthorised works. There is a narrow defence for works that were urgently necessary for safety, health or the preservation of the building, where only the minimum necessary works were carried out and the local planning authority was notified in writing as soon as reasonably practicable — but this is a defence to be relied on only in genuine emergencies, not a way to avoid applying for consent.

Does Listed Building Consent cost anything to apply for?

No — unlike most planning applications, there is currently no statutory application fee for Listed Building Consent in England. [GPS TO VERIFY: confirm this remains correct against the current Planning Portal fee schedule at the time this guide is published, since fee schedules are updated periodically.] If your project also needs planning permission for the same works, a fee is payable for that separate application.

How long does an application take to decide?

Local planning authorities generally aim to determine a Listed Building Consent application within eight weeks of validation, though this can extend for more complex cases, where Historic England is consulted, or by agreement with the applicant. The clock only starts once the application is validated — meaning the authority is satisfied it has everything it needs, heritage documents included — so an incomplete application effectively costs you the delay twice: once while the missing information is chased, and again while the full eight weeks restarts from validation.

What about routine repairs and maintenance?

Genuine like-for-like repair — replacing a rotten section of timber with matching timber, repointing with a matching mortar mix, redecorating in the same colours and materials — generally does not need Listed Building Consent, because it does not alter the building's special interest; it maintains it. The distinction that matters is repair versus alteration: as soon as a repair becomes an opportunity to change a material, a profile, a layout or an appearance, even in ways that might seem like an improvement, it risks crossing into work that does need consent. When in doubt about whether a specific repair is genuinely like-for-like, checking first is safer than assuming.

What if I am not sure whether my planned work needs consent?

Because the test covers internal work and can extend to curtilage structures most owners would not think of as "listed", the safest approach for anything beyond routine maintenance and like-for-like repair is to check with your local planning authority's conservation officer, or get a professional first read, before starting work. Many authorities also offer a formal Listed Building Consent pre-application advice service for a fee, which gives a more considered view than an informal enquiry.