How to Check If a Property Is in an Article 4 Area Before You Offer

Article 4 vs Licensing: Two Different Problems, Often Confused

I see this mix-up constantly. An investor hears 'Article 4 area' and thinks it means extra licensing paperwork. It doesn't. These are two completely separate regulatory layers, and confusing them is how people end up owning a property they can't legally operate as an HMO.

Article 4 governs whether you may *create* an HMO. Licensing governs whether you may *let* one. As the August App research note from July 2026 puts it plainly: Article 4 controls creation; licensing controls operation. Both can apply to the same property simultaneously — but failing on Article 4 is far more serious, because it's a planning matter, not an administrative one.

Outside an Article 4 direction, converting a family home (Use Class C3) into a small HMO (Use Class C4) is permitted development. No planning application required. Inside an Article 4 area, that permitted development right is removed. You need full planning permission before the conversion is lawful. If you buy, convert, and let without that permission, you're in breach of planning control — and enforcement notices, fines, and mandatory return to C3 use are all on the table.

Licensing is a separate track. Mandatory HMO licensing applies nationally to properties with five or more occupants forming two or more households. Additional and selective licensing schemes are council-by-council, and they're accelerating fast. The Selective Licensing General Approval 2024 — made on 23 December 2024 — removed the cap on how much of an area a council can designate for selective licensing. That's a significant shift. Councils no longer need Secretary of State sign-off for large schemes, which means new designations are arriving faster than many investors track.

The 3-Minute Check: Exactly How to Do It Before You Offer

This is the section worth saving. Run through these steps in order — it takes under five minutes if you know where to look, and it tells you everything you need before putting pen to paper on an offer.

**Step 1: Find the council's interactive planning map.** Every local planning authority in England is required to publish its Article 4 directions. Most do this through an interactive GIS map on their planning portal. Search '[council name] Article 4 direction map' and you'll usually land on it within two clicks. If the council uses a third-party platform like Idox or Arcgis, look for a layer called 'Article 4 Directions' or 'HMO Directions'. Toggle it on, drop the pin on your target property, and you'll see immediately whether it falls inside a designated area.

**Step 2: Check the direction date — it matters more than you think.** Article 4 directions aren't retrospective on existing lawful HMOs, but the date determines what prior approval rights existed. Ealing's direction came into effect immediately on 30 October 2024 — no prior approval period, no grace window. Middlesbrough's direction took effect 8 February 2025. Walsall went borough-wide from 1 October 2025. If a property was already operating as an HMO before the direction date and has the documentation to prove it, that use may be lawful by virtue of its prior established use. If it doesn't have that documentation, you're buying a problem.

**Step 3: Ask for the planning permission or certificate of lawfulness.** This is non-negotiable for any property inside an Article 4 area. A certificate of lawful use (CLU) under Section 191 of the Town and Country Planning Act 1990 is the gold standard — it's a formal council determination that the existing use is lawful. Planning permission for C4 use also works. No document? That's not a deal-breaker automatically, but it is a price negotiation lever. I'd want a meaningful discount to absorb the cost and risk of retrospective planning, and I'd want a solicitor to advise on enforcement risk before exchange. Consider consulting a qualified solicitor before proceeding on any property where lawful use documentation is absent.

**Step 4: Check the council's HMO licensing register separately.** Once you've confirmed the planning position, check the licensing register. Most councils publish their mandatory HMO licence register online. Some also publish additional licensing registers. Cross-reference the property address. A licence in the current owner's name doesn't transfer automatically — you'll need to apply for a new licence as the incoming owner. Budget for that, and budget for any works conditions the previous licence carried.

Reversion Risk: The Trap Most Investors Don't See Coming

There's a scenario that Black Book Investments has flagged and that I think deserves more airtime than it gets: reversion risk.

Suppose you buy a property currently tenanted as a family home — a C3 use. The vendor tells you it was an HMO 'years ago'. You assume you can simply put HMO tenants back in. Inside an Article 4 area, that assumption is wrong. Changing from a family let back to an HMO is a material change of use from C3 to C4, and it requires planning permission. The fact that the property was previously an HMO is irrelevant if that use has been abandoned — and courts have found that as little as a few years of C3 use can constitute abandonment of the prior C4 use.

This isn't a niche edge case. It catches investors who buy properties with 'HMO potential' without verifying the planning history. The fix is straightforward: check the planning history on the council's planning portal (search by address), look for any previous HMO planning permissions or C4 use records, and if the property has been in C3 use for any significant period inside an Article 4 area, treat it as needing fresh planning permission.

The cost of getting this wrong isn't just the planning application fee. Enforcement action can require you to revert the property to C3 use, evict tenants, and potentially lose your mortgage lender's confidence in the security. That's not a recoverable situation easily.

Which Areas Are Active Right Now — and Where to Watch

Article 4 directions are spreading. That's not scaremongering — it's the observable trajectory. Walsall went borough-wide from 1 October 2025. Middlesbrough introduced its direction from 8 February 2025. Ealing acted immediately on 30 October 2024 with no prior approval period at all, which was a deliberate signal to investors that they weren't getting a grace window.

The calendar entry research notes also flag Gloucester and Hammersmith as areas where demand for Article 4 information is rising — which typically precedes formal consultation. Councils consult before designating (minimum 12 months notice is required for a standard direction), so monitoring local planning consultations is genuinely useful forward intelligence.

For active investors covering multiple geographies, manually checking each council's GIS map for every prospective deal is time-consuming. ZARSK surfaces planning and licensing status directly on listings at [zarsk.co.uk](https://zarsk.co.uk), which cuts the lookup time significantly. That's the practical argument for using a platform built specifically for HMO due diligence rather than stitching together council portals one by one.

But even if you're doing this manually, the process I've described above is reliable. The key discipline is doing it *before* you offer, not after you've exchanged.

Article 4 directions will keep spreading — that's the direction of travel, and the Selective Licensing General Approval 2024 signals that councils now have more administrative freedom to act, not less. The investors who'll get caught are the ones treating due diligence as something that happens after the solicitor gets instructed. Three minutes on a planning map before you offer costs nothing. Buying a property you can't legally convert costs everything.