Secretary of State for Communities and Local Government and another v Welwyn Hatfield Borough Council [2011] UKSC 15

Welwyn Hatfield v Beesley is the Supreme Court case about a house deliberately built to look like a hay barn so that the residential development would remain hidden from the council until the enforcement period had expired. The Supreme Court unanimously allowed Welwyn Hatfield’s appeal and held that Mr Beesley could not obtain a certificate of lawfulness for the concealed dwelling.

Neutral citation

[2011] UKSC 15

Court

Supreme Court of the United Kingdom

Judgment date

6th April 2011

Judge

Lord Phillips, Lord Rodger, Lord Walker, Lady Hale, Lord Brown, Lord Mance and Lord Clarke

Case number

UKSC 2010/0036

What happened at the Beesley site

Mr Beesley owned Green Belt land near Northaw in Hertfordshire. He obtained planning permission for an agricultural hay barn subject to a condition restricting it to agricultural storage.

What he actually constructed was, internally, a fully equipped three-bedroom house with living rooms, bathrooms, a gym and services. Externally it was designed to appear to be the permitted barn.

Mr Beesley and his wife moved into the building in August 2002 and lived there continuously. He deliberately kept the residential use from the council and, after four years, applied for a certificate of lawfulness.

There had been no change of use to a dwellinghouse

At the time, section 171B(2) of the Town and Country Planning Act 1990 contained a four-year enforcement period where a breach consisted of a change of use of a building to use as a single dwellinghouse.

The Court of Appeal had treated the short period between completion of the house and Mr Beesley moving in as a period of no use, followed by a change to residential use.

The Supreme Court rejected that analysis. The building had been designed and built as a house from the outset. Looking at the matter realistically, it was artificial to say that a newly completed house intended for immediate occupation first had no use and then changed use when the owner moved in a few days later.

The unauthorised construction was therefore an operational development issue rather than a change of use falling within the particular wording of the former section 171B(2).

The house was not the permitted barn

The Supreme Court also rejected the suggestion that the building could be treated as the permitted agricultural barn simply because that was how it appeared externally.

Apart from its deceptive appearance, it had been designed and constructed as a dwellinghouse. The court applied the approach in Sage: the planning character of what was built cannot sensibly be divorced from its design, purpose and physical reality.

Deliberate deception could not be used to obtain immunity

The Supreme Court went further because the issue was of wider importance. Mr Beesley’s scheme had involved positive and sustained deception directed at the planning system itself.

The permissions for a hay barn were obtained on a false basis, the building was deliberately made to look agricultural, and steps were taken to prevent the true residential development being discovered during the enforcement period.

The court held that Parliament could not have intended the enforcement immunity provisions to reward conduct of that exceptional kind. Even if the statutory wording had otherwise appeared to assist Mr Beesley, the deliberate deception would have prevented him from relying on it.

Welwyn Hatfield was an exceptional concealment case

The Supreme Court was careful not to turn every unauthorised development into a case of fraud or concealment. Planning breaches range from innocent mistakes through to deliberate attempts to defeat planning control.

Lord Brown described Mr Beesley’s conduct as being in a category of its own. The public-policy reasoning was aimed at truly egregious cases where the concealment itself was deliberately designed to prevent enforcement.

Planning enforcement orders were introduced afterwards

The Localism Act 2011 subsequently introduced the planning enforcement order procedure, now found in sections 171BA to 171BC of the Town and Country Planning Act 1990. It provides a statutory route for enforcement where a breach has been deliberately concealed.

Current Planning Practice Guidance also recognises the Welwyn Hatfield principle when discussing deliberate concealment. Depending on the circumstances, an authority may seek a planning enforcement order or consider direct enforcement outside the normal time limit.

The enforcement time limits have changed since Beesley

This judgment must be read with an important current-law warning. When Welwyn Hatfield was decided, section 171B contained four-year periods for operational development and changes of use to a single dwellinghouse.

In England, those former four-year periods were extended to ten years from 25th April 2024, subject to transitional protection for breaches where the former four-year period had already begun before that date. Our enforcement time limits guide explains the current position.

Welwyn Hatfield therefore remains important for its reasoning on the character of a newly built dwelling and deliberate concealment, but its references to the ordinary four-year enforcement period are historic.

Read the full Welwyn Hatfield judgment

The official Supreme Court judgment is held in the Planning Geek case law library. Gold Members can open the protected PDF below.

Related Planning Geek guidance

For current enforcement law, see enforcement time limits and the planning enforcement order. For residential planning uses, see Class L and our guide to dividing or splitting a house.

Welwyn Hatfield v Beesley Case Law Page Updated: 9th September 2026