Guidance on Chargeable Land Transactions for Residential Property Under Construction

When a property under construction counts as a dwelling for SDLT

For SDLT, land may be treated as residential even if the home is not finished, but only if a dwelling is already being physically built or adapted at the effective date of the transaction. Planning permission, demolition, site clearance, excavation, or foundations alone are not usually enough. HMRC’s view is that the building itself must have started above foundation level, and the facts on the transaction date are what matter most.

• A property can be residential for SDLT if a dwelling is genuinely in the course of construction or adaptation.
• The key test is the position at the effective date of the transaction, not what happens later.
• Planning permission on its own does not make land residential, though it can help show the intended use once works have physically started.
• HMRC says preparatory works such as demolition, clearance, excavation, and laying foundations do not by themselves amount to construction of a dwelling.
• HMRC generally treats construction as having begun when building works above the foundations are underway.
• For conversions, there must be real physical adaptation in progress, not just an intention or permission to create a dwelling.

Scroll down for the full analysis.

When a property under construction counts as a dwelling for SDLT

This page explains when land can be treated as residential property for SDLT because a dwelling is already being built or adapted at the effective date of the transaction. This matters because SDLT works differently for residential and non-residential property, and the answer can affect the rate and treatment of the purchase.

What this rule is about

For SDLT, a property can count as residential not only where there is already a completed dwelling, but also where a building is in the process of being constructed or adapted for use as a dwelling. This is a distinct category.

The key issue is timing. At the date of the transaction, has work reached the point where there is genuinely a dwelling being built or adapted, rather than just plans, permissions, clearance work, or general site preparation?

This category is unusual because it requires looking at what the finished building is expected to be used for. That is necessary because, while the works are incomplete, you cannot always judge current suitability by looking only at the site as it stands.

What the official source says

HMRC says that the guidance for an existing building that is “used as or suitable for use as a dwelling” also applies here, but with an important difference: for a building that is still being constructed or adapted, intended or anticipated use becomes relevant.

HMRC’s position is that this category only applies if the process of construction or adaptation is physically underway at the time of the land transaction.

Planning permission by itself is not enough. If permission has been obtained but no work in line with that permission has actually started by the transaction date, HMRC does not treat that alone as being in the process of construction or adaptation.

If construction or adaptation has begun, planning permission can still be important evidence of what the finished building is meant to be. In other words, it can help show whether the eventual building is intended to be a dwelling.

For construction of a dwelling, HMRC says the property will be treated as a dwelling once building works on top of the foundations have begun. A mere hole in the ground is not enough. Nor are preparatory works such as demolition of earlier buildings or site preparation. HMRC accepts that these may be construction-related activities in a broad sense, but says they are not the construction of the building itself for use as a dwelling.

What this means in practice

The practical question is not simply whether the buyer intends to build a house, or even whether the seller has obtained planning permission for one. The question is whether, by the effective date of the transaction, the dwelling is already being physically constructed or adapted.

This creates a clear dividing line:

• If there is only planning permission, design work, demolition, site clearance, excavation, or foundations work, HMRC’s view is that this is not yet enough.
• If the building of the dwelling itself has started above foundation level, HMRC treats that as being in the process of construction.

That distinction can affect whether the land is treated as residential property at the time of purchase.

The same broad approach applies where an existing building is being adapted into a dwelling. There must be a real, physical process of adaptation underway, not just an intention or permission to carry it out.

How to analyse it

A sensible way to approach the question is to work through the following points.

• What is the state of the property at the effective date of the transaction? The position must be tested at that date, not by reference to what happens later.
• Is there physical construction or adaptation underway? If not, this category is unlikely to apply.
• Are the works merely preparatory? Demolition, site clearance, and similar enabling works do not, on HMRC’s view, amount to construction of a dwelling.
• Has the building itself started to rise above the foundations? HMRC treats this as the point at which a dwelling under construction can be recognised for this purpose.
• What is the finished building intended to be? If works have started, planning permission and similar evidence may help show whether the completed building is meant to be a dwelling.
• If the case involves adaptation rather than new build, has the conversion or adaptation genuinely begun in physical terms?

This is ultimately a factual exercise. The labels used by the parties are less important than what was actually on site when the transaction took effect.

Example

Suppose a buyer acquires a plot with planning permission for a detached house. Before completion, the old structure has been demolished, the site has been cleared, and foundations have been laid, but no building work above the foundations has begun.

On HMRC’s approach in this manual page, that is not yet enough for the property to be treated as a dwelling in the process of being constructed. Planning permission helps show intended use, but planning permission plus preparatory works does not by itself satisfy this category.

By contrast, if walls or other building works above the foundations had already begun by the effective date, HMRC would regard the property as being in the process of construction as a dwelling, assuming the evidence shows that the finished building is intended for residential use.

Why this can be difficult in practice

The main difficulty is deciding exactly when construction or adaptation crosses the line from preparation into actual construction of a dwelling.

In straightforward cases, the answer is clear. A site with only planning permission and clearance works is on one side of the line. A partly built house standing above foundations is on the other.

Harder cases can arise where substantial groundwork has been done, foundations are in place, or adaptation works have started but the eventual residential use is not obvious from the physical state of the property alone. In those cases, evidence such as planning permission may be important, but only if physical works have already begun.

Another practical difficulty is that HMRC’s manual states its view of how the legislation applies. The legislation itself remains the legal test. In most cases the manual gives a workable approach, but the outcome will still depend on the facts at the transaction date.

Key takeaways

• A property can count as residential for SDLT if a dwelling is already in the process of being constructed or adapted.
• Planning permission alone is not enough; physical construction or adaptation must have started by the transaction date.
• HMRC treats preparatory works as insufficient, and says construction of a dwelling begins when building works above the foundations have started.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Guidance on Chargeable Land Transactions for Residential Property Under Construction

View all HMRC SDLT Guidance Pages Here