You own a listed building - or you're thinking of buying one - and you want to make changes. Maybe it's a new kitchen, a bathroom renovation, or an extension at the rear. Maybe you've been told the building is "protected" and you're not sure what that actually means for the work you want to do.
Here's the thing most people don't realise: owning a listed building doesn't mean you can't change anything. It means changes that affect the building's character need formal consent before you start. The process is straightforward, the application is free, and well-considered proposals are approved regularly. But doing work without consent is a criminal offence - and ignorance is not a defence.
This page explains what Listed Building Consent is, when you need it, when you don't, and how to get it right.
A listed building is a building that has been judged to be of national importance for its architectural or historic interest. It is included on the National Heritage List for England, maintained by Historic England. You can check whether your building is listed at historicengland.org.uk.
There are roughly 500,000 listed buildings and structures in England. They range from medieval churches to post-war housing. If your property was built before 1850, it is very likely to be listed.
Buildings are graded according to their significance. Grade II covers about 92% of all listed buildings - these are buildings of special interest. Grade II* covers about 6% - particularly important buildings. Grade I covers about 2% - buildings of exceptional interest. The grade affects who is consulted on your application, but the consent process is the same for all grades.
The listing protects the entire building - inside and out. A Georgian staircase is as protected as the facade. The listing also covers any structure within the curtilage of the building that was there before 1 July 1948 - boundary walls, outbuildings, garden structures. If it's within the grounds and it's historic, it's probably covered.
The legal test is set out in section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990. You need consent for any work that would "affect the character of the building as a building of special architectural or historic interest." That includes work inside and outside.
The difficulty is that "affecting character" is not precisely defined. It requires judgment - and the local authority's conservation officer is the person who makes that judgment. This is why speaking to them before you start is so important.
The general rule
If in doubt, assume you need consent and check with the conservation officer first. It is always better to ask the question before you start than to face enforcement action after the work is done.
Any structural alteration - removing or opening up walls, changing floor levels, altering the roof structure. Extensions to the building, whether at the rear, side, or above. Changing or replacing windows and doors, unless the replacements are identical in material, design, profile, and finish. Removing or altering original features - fireplaces, cornicing, panelling, staircases, historic flooring. Installing new services where the work affects historic fabric - routing pipes or cables through original walls, floors, or ceilings. Any demolition of any part of the building. Changes to the facade or exterior appearance.
This guidance is drawn from Historic England Advice Note 16, which is the most practical reference available on this question.
Painting internal walls in a different colour - unless you're removing a historic paint scheme or painting over original decorative finishes. Like-for-like repairs using the same materials and techniques - repointing brickwork with lime mortar, repainting windows in the same colour and finish, replacing damaged tiles with matching ones. Replacing modern fixtures and fittings that have no historic interest - a kitchen installed in the 1990s, a modern bathroom suite, contemporary light fittings. Secondary glazing - installing a secondary window unit behind the original historic window, which maintains the facade while improving insulation. Emergency repairs to prevent further damage - though you must document the work and notify the council as soon as reasonably practicable.
Kitchen and bathroom refurbishments - fine if you're replacing modern fittings, but if the work involves removing original fabric or altering the layout, consent is likely needed. Replacing a boiler or heating system - depends on where the new pipes and flues are routed and whether they affect historic fabric. Installing insulation - internal wall insulation may affect historic plaster; loft insulation is usually fine. Re-roofing - like-for-like with matching materials may not need consent; changing the material or profile will.
For detailed guidance on specific types of work, see Historic England Advice Note 16.
This is the part most listed building owners don't hear enough: a huge amount is possible.
Extensions are regularly approved - Historic England's own guidance recommends that extensions should be "lower and smaller" than the original building and typically added at the rear, but within those principles, contemporary design is actively encouraged. A well-designed modern extension to a Georgian or Victorian house can be one of the most striking projects in architecture.
Internal remodelling is possible. Kitchens, bathrooms, and living spaces can be redesigned - the key is understanding which elements of the building are significant and designing around them rather than through them. Many of the most admired residential renovations in London are listed buildings where the designer understood the building well enough to know what to keep and what to change.
Energy improvements are increasingly supported. Secondary glazing, improved insulation, heat pumps, and solar panels can all be installed on listed buildings with the right approach. Historic England has published specific guidance on this: Advice Note 18 covers adapting historic buildings for energy and carbon efficiency.
The buildings that get into trouble are the ones where the owner started work without asking. The ones that succeed are the ones where the owner talked to the conservation officer early, understood the building's significance, and designed the project around it.
Owning a listed building doesn't mean you can't change anything. It means the changes need to be considered - and consented.
Listed Building Consent applications are submitted through the Planning Portal or directly to your local authority. You will need to provide a heritage statement - a document explaining the significance of the building and how the proposed works will affect it - along with detailed plans, drawings, and a schedule of works.
The level of detail should be proportionate to the project. Historic England's guidance states that "where significance and/or impact are relatively low, only a few paragraphs of information might be needed."
The local authority should determine the application within 8 weeks, which includes a 21-day public consultation period. For Grade I and Grade II* buildings, or for particularly significant proposals, Historic England will be consulted and the process may take longer.
Pre-application advice is strongly recommended. Most local authorities offer this - some for free, some as a paid service. Speaking to the conservation officer before you submit means you can adjust your proposals in advance rather than having them refused and starting again.
This is where listed buildings are fundamentally different from ordinary planning. Under section 9 of the Planning (Listed Buildings and Conservation Areas) Act 1990, carrying out unauthorised works to a listed building is a criminal offence. Not a planning breach - a criminal offence.
The penalties: in the Magistrates' Court, a fine of up to £20,000 and/or up to six months' imprisonment. In the Crown Court, an unlimited fine and/or up to two years' imprisonment. The court is specifically required to consider any financial benefit the owner gained from the unauthorised works when determining the fine.
It does not matter whether you knew the building was listed or whether you intended to cause harm. If the works were carried out and they affect the building's character, the offence is complete. There are very limited statutory defences - essentially confined to genuinely urgent works necessary for safety or the preservation of the building, where you notified the council as soon as reasonably practicable.
The local authority can also serve a listed building enforcement notice requiring you to undo the works and restore the building to its former state, at your own cost. And when you come to sell, a buyer's solicitor will check for unauthorised works - any discrepancy between the building's current state and its listed description will be flagged.
This is not intended to alarm - it is intended to make clear why checking before you start is non-negotiable.
Common mistakes
Assuming that because the work is internal, consent isn't needed. The listing protects the inside of the building as much as the outside.
Replacing historic windows with modern alternatives without consent. Even if the originals are in poor condition, the default expectation is repair rather than replacement. If replacement is justified, the new windows must match the originals in material, design, and detail.
Relying on a builder's assurance that "it'll be fine." The builder is not the arbiter of whether consent is needed - the conservation officer is. And if unauthorised work is carried out, both the owner and the person who caused the work to be done can be prosecuted.
Not checking the listing before buying the property. The listing is public record. Check the National Heritage List for England before you exchange contracts, and factor the consent process into your timeline and budget.
Listed Building Consent is separate from planning permission. You may need both. An extension to a listed building, for example, will typically require Listed Building Consent (for the impact on the historic building) and planning permission (for the new structure). The two applications can be submitted together.
Building regulations also apply to listed buildings, though there are specific provisions within the approved documents that acknowledge the need to balance modern standards with heritage conservation. Your local authority's building control team should be familiar with working on listed buildings.
If the building your flat is in is listed, you have an additional layer of consent. Listed Building Consent is required for any work that affects the character of the listed building - and this applies to internal alterations within individual flats as well as external ones.
This means you may need three separate consents: freeholder permission (under your lease), Listed Building Consent from the local authority, and building regulations approval. The good news is that Listed Building Consent is free to apply for. The less good news is that it adds time and complexity to the process. For more on leasehold alterations, see our leasehold guide.
Retrospective planning permission - what happens if unauthorised work has been done to a listed building. There is no time limit for enforcement.
Building without planning permission - the enforcement process and your options for regularising unauthorised work.
Article 4 directions - additional restrictions that may apply in conservation areas where listed buildings are concentrated.
Permitted development in a conservation area - the tighter PD rules that apply on designated land.
Lawful development certificates - confirming that work is lawful, which is especially important for listed buildings.
Free Consultation
Listed building projects need professional guidance from the start - not after the plans are drawn. A free 30-minute consultation will cover what's realistic for your building, what the conservation officer is likely to accept, and the most effective way to approach the consent process. No obligation. No preparation needed.
Content verified against the Planning (Listed Buildings and Conservation Areas) Act 1990, Historic England Advice Note 16 (Listed Building Consent), the Planning Portal, and Historic England's published guidance. Correct as of April 2026. This page is for general information only and does not constitute legal advice.
April 2026