Do I need listed building consent for internal work?

Often yes. A listing covers the whole building, inside and out, not just the front. So internal changes that affect its character can need listed building consent, the council's permission to change a listed building. That covers things like removing a period staircase, original plasterwork, an internal wall, or historic joinery. Routine repair using matching materials usually does not. The test is whether the work changes the building's special interest, not whether anyone can see it from the street.

What happens if previous owners did unconsented work?

It becomes your problem. Unauthorised work to a listed building is a criminal offence. The liability runs with the building, not with the person who did the work. So as the current owner you can be ordered to put it right, even if someone else did it years before you arrived. This is why a listed building's history matters before you buy, and why a buyer's solicitor asks about it.

Can I replace the windows in a listed building?

It depends what you put in their place. Repairing an original window, or replacing it like-for-like in matching timber, is often acceptable and may need no consent, because it is genuine repair. Swapping a timber sash window for a plastic (uPVC) one changes the building's character and needs consent. The same is true of changing the pattern of the glazing, and that consent is usually refused. The original windows are part of what the listing protects, so the default is repair, not replacement.

Is renovation work on a listed building VAT-free?

No, not any more. Approved alterations to listed buildings were free of VAT, the tax added to the cost of building work, until 1 October 2012. That relief was then withdrawn. The standard rate of VAT, 20%, now applies to listed-building work just like any other renovation. Some guides still describe the old relief that made it free, but it no longer exists.

Listed Building Consent: A Grade II Guide

Start with one window

You own a flat in a Georgian terrace in Chelsea. One sash window at the front rattles in the wind and leaks heat. You want to replace it with the same window, this time with double glazing. It is your flat. It is one window. You call a joiner.

The joiner asks one question. Is the building listed? It is, Grade II. He tells you that you may need permission before he can start. Not planning permission for an extension. A different permission, for the window.

That answer surprises most people. The window is small. The change is sensible. You are making the flat warmer, not bigger. To see why a single window can need permission, you have to look at what the listing covers.

What the listing actually covers

England has three grades of listed building. Grade I is for buildings of exceptional interest. Grade II* (said "two star") is for buildings of more than special interest. Grade II is for buildings of special interest. Most listed buildings, about 92%, are Grade II. Historic England sets out the grades.

Here is the part people get wrong. The listing does not just protect the front of the building. It protects the whole thing, inside and out. The staircase. The cornices, the decorative plaster where the wall meets the ceiling. The fireplaces. The original doors. A Grade II listing covers the lot, unless the official list entry says otherwise.

It can also reach past the building itself. The law protects the curtilage, meaning the land and the structures around the building. If a garden wall, a coach house, or a pair of gate piers has stood there since before 1 July 1948, it counts as part of the listing, even when nobody wrote it down. So the wall at the back of your garden can be protected by the same listing as your flat.

That is why the window matters. It is not a detail sitting outside the protection. It is part of the protected building.

Repair, or change?

The permission the joiner mentioned has a name. Listed building consent (LBC) is the separate permission you need before you change a listed building in a way that affects its character. Character means the look of the building and its historic interest. The Planning Portal explains the consent.

The whole thing turns on one line. Repair usually needs no consent. Change usually does.

Repair means like-for-like. You replace a cracked roof slate with the same kind of slate. You take a tired sash window out, fix the moving parts, and put it back in matching timber, with the same glass. The building looks the same afterwards. That normally needs no consent.

Change means the look or the material moves. You swap a single-glazed sash for a double-glazed unit with a thicker frame. You take out an original fireplace. You knock two rooms into one. That normally needs consent.

Now look back at your window. Repaired in matching timber, it is repair. Replaced with double glazing in a thicker frame, it is change. The two jobs sit on opposite sides of the line, and from the pavement they can look almost identical. There is no chart on the council website that tells you which side your exact window lands on. Someone has to look at it.

It is two permissions, not one

There is a second trap in the word "permission." People treat it as one thing. It is two.

Planning permission and listed building consent are separate. They come from different laws and ask different questions. Planning permission asks whether you can develop the site: build out, build up, change how the building is used. Listed building consent asks whether your work harms the building's character.

A lot of work needs both. An extension to a listed house usually needs planning permission and listed building consent, applied for together. A change inside the house, like removing a wall, often needs no planning permission at all, but still needs listed building consent. You can hold one and still be blocked by the other.

Two more facts are worth knowing. First, most listed buildings lose their permitted development rights. Permitted development (PD) is the set of small changes most homeowners can make without asking the council. For a listed building, most of those rights are switched off, so jobs that would be automatic elsewhere need an application here. Second, there is no fee to apply for listed building consent. The planning application beside it does carry a fee, but the consent itself is free to apply for.

Take the two boroughs at the centre of this. The Royal Borough of Kensington and Chelsea (RBKC) has over 3,800 listed buildings. Westminster has around 11,000. In both, the council is the body that decides your application. Who else gets a say depends on the grade, which is the next thing.

How long it takes, and who says yes

On paper, a decision takes eight weeks from the day the council accepts your application. In practice, for anything beyond a simple repair in these boroughs, twelve to eighteen weeks is more realistic. That second figure is what people in the trade see, not a published number. The published numbers point the same way. In 2023/24, only 67% of these decisions in London were made on time, the lowest rate in England. Historic England publishes the figures.

The odds of a yes are good, though. Across England in the same year, 92% of listed building consent applications were approved. A refusal is the exception. The delay, not the refusal, is the usual problem.

Who decides depends on the grade. For Grade II, the council's conservation officer normally decides on their own. For Grade I and Grade II*, the council must also ask Historic England, the public body that advises on heritage. There is a London twist. In Greater London, Historic England has extra powers and is consulted on more cases than it would be elsewhere. So a London listing can involve more people than the same listing outside the capital.

Two local rules are worth knowing, because they are easy to miss. RBKC was the first council in England to use a Local Listed Building Consent Order (LLBCO), which is a borough-wide rule that grants consent in advance for certain jobs, so you do not have to apply one by one. RBKC has used it for solar panels (since 2022) and for some double glazing and secondary glazing on Grade II buildings (since 2023). If your job fits one of those orders, the consent is already given. In Westminster, a "retrofit first" policy adopted on 21 January 2026 puts more weight on keeping and upgrading the existing building rather than stripping it out. Westminster set out the policy. Both rules change what gets approved.

One more thing, about money. A common belief is that approved changes to a listed home are free of VAT, the tax added to the cost of building work. That stopped being true on 1 October 2012. Today the standard 20% applies to both repairs and changes on a listed home. On a large refurbishment that is a real number, and it belongs in the budget from the first day. If you are pricing a project, the renovation cost calculator gives an indicative range, and our piece on how a cost plan differs from a quote explains why early numbers move.

The jobs people actually ask about

A few jobs come up again and again. The repair-or-change line answers most of them. Like-for-like repair usually needs no consent. A change to the look or the material usually does. Here is how that plays out on the jobs people ask about most.

Replacing a window in matching timber: usually no consent, because the building looks the same after.
Swapping that window for double glazing or a new style: usually needs consent, because it changes the look and the material.
Removing or moving an internal wall: usually needs consent, because it changes the inside of a protected building.
Fitting a new kitchen or bathroom: usually no consent if you only swap the units, usually needs consent if you change the layout or remove original features.
Repointing (replacing the old mortar between the bricks) in matching lime: usually no consent, because it is like-for-like. Repointing in cement instead: usually needs consent, because the material changes.
Adding a window to the roof, such as a rooflight: usually needs consent, because it adds a feature that was not there before.
Ordinary repainting inside: usually no consent.

Notice the word "usually" on every line. None of these is a fixed rule. The council decides your specific case.

Skip it, and it follows the house

Now the part that should change how you treat all of this.

Doing work to a listed building without the consent it needed is a criminal offence. Not a fine you write off as a cost of the job. A crime. And it is what the law calls strict liability, which means you can be found guilty even if you did not know the building was listed. "I did not realise" is not a defence.

The penalty is often quoted wrong. The figure you will still see in older guidance, a £20,000 maximum fine, is out of date. That cap was removed on 12 March 2015. The fine is now unlimited, and for the most serious cases the court can add up to two years in prison.

The fine is not the worst part. Unlike a normal planning breach, there is no time limit on this. With most planning problems, once enough years pass, the council can no longer act. With a listed building, that clock never starts. The exposure does not expire, and it does not stay with the person who did the work. It attaches to the building. Buy a listed house where a previous owner replaced the windows without consent, and you inherit the problem.

That problem usually surfaces at the worst moment, when you sell. The buyer's solicitor asks for the consents. If they are missing, the sale stalls while everyone works out whether to apply for consent late, insure the risk, or drop the price. Work done quietly years ago becomes a live issue at the exact point you want a clean sale.

And here is the honest limit. Nobody can tell you in advance, for certain, which side of the line your window lands on. Not the council, not a heritage consultant, not Myrmex. The judgement only exists once someone qualified has looked at the specific job.

Which means the question you started with had the wrong shape: a Grade II listing was never a list of changes you are banned from making, it is a duty to keep the building's character, judged job by job by a person.

So the safe move is to settle the question before the work starts, not after. That means a heritage statement, setting out what the building is and how the work would affect it. For the borderline jobs, it means a Certificate of Lawfulness, a formal letter from the council confirming a job needs no consent. Every consent is agreed before anyone lifts a tool. That is why Myrmex puts the consent question into the pre-construction stage, before the first wall is opened.

Grade II Listed: What You Can Change