Listed building consent: what you can and cannot change

Owning a listed home does not mean leaving everything untouched. It does mean understanding what makes the building special before changing it. Replacing windows, opening up rooms or updating a bathroom can raise different questions from the same work in an unlisted property.

At Simplicity Designs, we help London homeowners and landlords plan alterations around those constraints. Here is our guide to what you can change, what needs consent and where to take care.

What does listed building consent cover?

Under the Planning (Listed Buildings and Conservation Areas) Act 1990, listed building consent is required for demolition, or alterations and extensions that would affect a listed building’s character as a building of special architectural or historic interest.

Protection is not limited to the front façade or features mentioned in the listing description. It generally covers the whole building, inside and out. Fixed objects and structures, and some older structures within its curtilage, can also be covered. The listing description is a starting point, not a complete inventory of protected features.

This applies to Grade II listed homes as well as buildings listed at higher grades. We recommend checking the National Heritage List for England and the council’s records before developing proposals.

Which changes usually need careful assessment?

Replacing historic windows or external doors often requires consent because materials, profiles, glazing and opening patterns contribute to character. A replacement that looks broadly similar is not automatically acceptable. Repairing existing joinery may be a better starting point.

Internal alterations can be equally sensitive. Removing walls, changing staircases, stripping plaster, lifting old floorboards or removing fireplaces may affect historic fabric or the original layout. A wall does not have to be structural to matter architecturally.

Extensions, loft conversions, roof alterations and new openings also need careful assessment. Even practical upgrades, such as extractor vents, boiler flues, insulation and solar panels, can affect the building’s character.

There is no universal list of forbidden changes. We assess the significance of the parts affected, the impact of the proposal and whether a less harmful design could achieve the same aim.

Can you redecorate or replace a kitchen?

Routine redecoration and genuinely like-for-like maintenance may not need listed building consent where they do not affect special character. However, “like-for-like” means more than matching the colour: materials, detailing and repair methods matter too.

Replacing modern kitchen units or bathroom fittings may be straightforward, but associated works can change the position. Cutting through historic beams for pipes, removing an old partition or installing impermeable finishes over traditional construction can create problems.

Before starting uncertain work, we advise seeking written advice from the council’s conservation team. Where appropriate, a certificate of lawfulness of proposed works can provide formal confirmation that specified alterations or extensions do not require listed building consent.

Is planning permission needed as well?

Listed building consent and planning permission are separate. An extension may need both, while an internal alteration might need listed building consent without needing planning permission. Permitted development rights under the General Permitted Development Order do not remove listed building consent requirements.

Building Regulations approval may also be required. We consider these routes together so that structural, fire safety and energy-efficiency proposals respect the historic building.

How do we prepare an application?

A useful application explains what exists, what will change and why the approach is appropriate. Depending on the work, this can include measured drawings, photographs, a heritage statement and detailed repair or material specifications.

Unauthorised works requiring listed building consent can be a criminal offence. Retrospective consent is not guaranteed, so we advise resolving consent requirements and relevant conditions before work starts.

If you are planning alterations to a listed building in Hackney or elsewhere in London, call our team on 0203 026 2883 or send your details to info@simplicity-designs.co.uk. We can help you understand the constraints and prepare a considered proposal.