Stamp duty on a home being built or converted
Homes being built or converted
A partly built or converted property may count as residential for SDLT. The answer turns on the physical state of the site when you buy.
- Planning permission alone is not enough in HMRC’s view.
- HMRC says a new build needs work above the foundations.
- Keep dated evidence of the work completed.
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty on a home being built or converted
Buying a plot or an unfinished conversion can still mean paying stamp duty as for residential property. The key issue is what existed when you bought it. Planning consent alone is not enough, in HMRC’s view. Physical work matters.
What this rule is about
Stamp duty land tax, usually called SDLT or stamp duty, treats residential and non-residential property differently. A building that is being built or changed into a home can count as residential property before anyone can live there.
An unfinished building cannot be assessed by its current use, because nobody can use it as a home yet; its expected finished use therefore matters. Timing decides it. The facts on the date of the purchase matter, not what happens months later.
What the official source says
The legislation includes a building that is in the process of being constructed or adapted for use as a home within residential property. HMRC’s manual explains how it thinks that test works. The manual is HMRC’s view, rather than the law itself.
- For this category, the expected use of the finished building is relevant.
- Construction or conversion must be physically underway when you buy.
- Planning permission by itself does not start that process, HMRC says.
- Once work has started, planning permission can strongly indicate the intended use.
- For a new build, HMRC says work above the foundations must have begun.
- A hole in the ground is not enough on HMRC’s view.
- Demolition and site preparation alone are also not enough, HMRC says.
What this means in practice
Do not assume that an empty plot with permission for a house is already residential for stamp duty. An unfinished shell may still be residential. No kitchen, bathroom or occupier changes that.
What actually decides it? First, whether real building or conversion work had begun. Then, if it had, whether the work was for a home.
- Keep clear records of the state of the site at completion.
- Read the approved plans alongside the work actually carried out.
- Separate groundwork and clearance from work on the building itself.
- Check the position at purchase, not the later finished result.
How to analyse it
Site evidence matters more than labels. Estate-agent details, planning applications and builders’ hopes cannot replace it.
- Identify exactly what land and buildings you bought.
- Fix the date when the purchase took effect for SDLT.
- Gather photographs, inspection records and contractor documents from that date.
- Ask whether work had moved beyond demolition, clearance and site preparation.
- For a new build, ask whether any work stood above the foundations.
- For a conversion, identify the physical work that was changing the building into a home.
- Use the planning documents to test the intended finished use once work had started.
Example
Alex buys a plot with permission for a house. Before completion, the seller has cleared the site, demolished an old shed and dug foundation trenches, while no part of the building stands above the foundations. That is all. HMRC’s manual says those facts do not show that construction of a home had started.
Change one fact: walls have been built above the foundations before Alex completes. HMRC says that is the point at which a new build is treated as being constructed for use as a home. The documents and dated photographs could make all the difference.
Why this can be difficult in practice
The dividing line can be narrow. Although work may look substantial and cost a great deal, it can still be preparatory rather than construction of the building when it merely clears, readies or exposes the site before building work begins. Later plans cannot change those facts.
You might think planning permission settles the question. It does not. It can help show the intended use, but HMRC says it cannot by itself prove that construction or conversion had begun.
- Site clearance can be extensive without being construction of the intended building.
- Foundation work needs careful evidence of what was complete at the time.
- Conversion projects need close scrutiny. The issue is whether the physical work, considered at the purchase date and against the building’s condition, was repair or a change into a home. Contemporaneous records may outweigh undated photographs.
Key takeaways
- Physical work, not planning permission alone, is central to HMRC’s view.
- For a new build, HMRC points to work above the foundations.
- Good dated evidence is vital where the site was unfinished.
Technical analysis
For advisers, and for anyone who wants to check the law behind this page. You do not need this section to understand the guidance above.
Legislation
- FA 2003 section 116 — what counts as residential property for SDLT
Official guidance
The pages below are HMRC’s guidance. Guidance is not law. It sets out how HMRC reads the legislation, and it is not binding on you, on a tribunal or on a court. Where guidance and the legislation differ, the legislation wins. HMRC can also change or withdraw guidance, and it may not cover your facts.
Where this is not settled
- The legislation does not define exactly when construction or adaptation begins.
- There may be difficult cases where work sits between site preparation and work that forms part of the intended building.
- Planning permission can be strong evidence of the planned use after work has begun, but it does not settle every factual question.
Evidence you would need
This kind of case is decided on the facts of the individual property. These are the records that usually settle it, and the ones an adviser would ask you for.
- Dated site photographs and video — whether there was a building above the foundations when you bought
- The contract, transfer and completion statement — the land and buildings included, and the relevant purchase date
- Planning permission and approved drawings — what the finished building was intended to become
- Building control inspection records — the stage reached and dates of inspected work
- Builder’s contract, programme and site diary — what work had started before completion
- Invoices for foundations, structural work and conversion work — the nature and timing of physical work
- A surveyor’s or architect’s report prepared at the time — the building’s condition and the work then underway
- Dated aerial images or satellite photographs — an independent record of visible building progress
Explore this with an AI
Readers often want to test their own situation. Copy the prompt below into ChatGPT, Claude or Gemini. It hands the model the actual legislation for this page rather than letting it answer from memory, and tells it to be explicit about what is uncertain. What comes back is information, not advice – check it against the links above.
I am researching UK Stamp Duty Land Tax (SDLT), which applies in England and Northern Ireland. MY QUESTION Stamp duty on a home being built or converted [Replace this with your own situation: what you are buying, the price, the dates, who the buyer is, and what you plan to do with the property.] THE LAW THIS TURNS ON - FA 2003 section 116 - what counts as residential property for SDLT https://www.legislation.gov.uk/ukpga/2003/14/section/116/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm00400 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. Guidance from HMRC is its view of the law, not the law, and does not bind a tribunal or a court. 2. Tell me what the rule actually requires, in plain English. 3. Tell me which facts decide the answer, and which facts would change it. 4. Tell me what evidence I would need to support the position. 5. Be explicit about anything unsettled or fact-sensitive. Do not guess. 6. Your training data has a cutoff and SDLT rates and reliefs change at fiscal events. Say so if you are not sure the law is current. POINTS ALREADY KNOWN TO BE UNCERTAIN ON THIS TOPIC - The legislation does not define exactly when construction or adaptation begins. - There may be difficult cases where work sits between site preparation and work that forms part of the intended building. - Planning permission can be strong evidence of the planned use after work has begun, but it does not settle every factual question. Do not give me a conclusion you cannot support from the provisions above.
Legislation links show Finance Act 2003 as it stood on 2025-11-17. The law may have changed since, and the rules that apply are those in force on the date of your transaction. The official guidance this page is based on is here.
This page was last updated on 31 August 2026
Useful article? You may find it helpful to read the original guidance here: Stamp duty on a home being built or converted
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