When a commercial building sits empty, the owner becomes liable for empty-property business rates after a short void-relief window: three months for shops and offices, six months for industrial units. From that point the owner is paying full rates on space that earns nothing - and that bill scales with the size of the building. GalimAI reads that liability directly from local-authority data, matched to Companies House and HM Land Registry ownership records, and identifies around 1,404 empty commercial premises in England and Wales, held by roughly 1,368 owners. Ranked by floor area, the top 15 areas alone carry about 49.7 million sq ft of empty commercial floorspace.
Empty floorspace is a council record before it is a listing. You can size owners paying empty-property rates by area and reach them directly, off-market.
Why floorspace, not just unit count
Counting empty units is useful, but it flattens a big difference: a 40,000 sq ft dead office block and a 400 sq ft empty kiosk both count as one unit, yet the owner of the office is bleeding far more every month. Holding cost - rates, insurance, security, service charge, and the interest on any debt against it - rises with floor area. So the floorspace view shows where the greatest standing loss sits, and therefore where owners have the strongest reason to sell. Because this is commercial data, GalimAI holds floor areas, so we can rank areas by empty square footage as well as by unit count.
Empty commercial floorspace by area
| Area | Empty commercial floorspace | Note |
|---|---|---|
| Greater London | ~34.8m sq ft | About 70% of the top-15 floorspace |
| Portsmouth | ~5.7m sq ft | Second-largest single area |
| Surrey | ~3.2m sq ft | |
| Bournemouth / Christchurch | ~2.9m sq ft | |
| West Northamptonshire | ~1.2m sq ft | |
| Brighton and Hove | ~455k sq ft | |
| Tyne and Wear | ~390k sq ft | |
| City of Plymouth | ~373k sq ft |
The top five areas hold about 48 million sq ft between them. Figures are counts from GalimAI's owner-matched dataset (owners tied to Companies House and Land Registry records), so they show where reachable owner-side pressure concentrates rather than a total-market census.
London's concentration is even sharper by floorspace
London dominates any empty-property map, but floorspace makes the point more forcefully than unit count does. London holds about 62% of empty commercial units by count, but roughly 70% by floorspace - because the capital's empty units are larger on average. Greater London's ~34.8m sq ft is nearly six times the next-largest area, Portsmouth. After that, the pressure spreads into a mix of big regional centres and compact secondary towns - Surrey, the Bournemouth and Christchurch coast, West Northamptonshire - where a handful of large voids can outweigh a city's worth of small ones.
The condition overlap
A strong sub-signal sits inside this pool. Filtering the empty-commercial owners to poor energy ratings (EPC F or G) returns 148 owners who are empty and EPC-failing at once - often legally unable to re-let under the MEES minimum-standard rules, which is frequently why the unit went empty in the first place. Empty plus un-lettable is a cleaner distress story than empty alone: the owner is trapped between an unlettable asset and the cost of the works needed to change that.
How to act on it
Because an empty building is rarely advertised as empty, it does not surface on a portal - it surfaces in the council and ownership data first. The way to reach these owners is from the owner side: identify who is paying empty-property rates, see how much floorspace they are carrying, and approach them directly with a fast, certain, off-market offer. An owner holding tens of thousands of empty square feet is often willing to accept a below-market price simply to end the standing loss - which is why empty floorspace sits at the intersection of the two biggest buyer signals: a motivated seller and a below-market opportunity at once.
Related: why commercial properties become empty, empty property in the UK by city, how to find empty property across the UK, and empty property and failing EPCs.
Why it's an opportunity
Empty floorspace is a motivated seller and a below-market opportunity at once - and empty rates make it a hard, standalone signal that scales with size.
- Recorded, not inferred - the owner is paying empty-property rates the council can see.
- Cost scales with floor area - the biggest voids carry the biggest standing loss, and the strongest reason to sell.
- Reach direct - a fast, certain, off-market sale ends the bleed.
Find owners holding empty commercial floorspace
Use the GalimAI portal to size empty commercial owners by area and floorspace across the UK, and reach them off-market.
Search the portalBook a callCommon questions
How much empty commercial floorspace is there in the UK?
Across the top 15 areas by floorspace, GalimAI identifies around 49.7 million sq ft of empty commercial floorspace, held by roughly 1,368 owners paying empty-property business rates. Greater London alone accounts for about 34.8 million sq ft, some 70% of that total.
Why measure empty property by floorspace instead of unit count?
Holding cost scales with floor area. A large empty unit carries a far bigger rates, insurance and security bill than a small one, so ranking by square footage shows where the greatest standing loss - and the strongest motivation to sell - actually sits. Because this is commercial data, GalimAI holds floor areas and can rank areas by empty floorspace, not just unit count.
Which UK area has the most empty commercial floorspace?
Greater London, by a wide margin: about 34.8 million sq ft, nearly six times the next-largest area, Portsmouth (5.7 million sq ft). London holds about 62% of empty commercial units by count but about 70% by floorspace, because its empty units are larger on average.
Data source: GalimAI proprietary analysis combining local-authority empty-property business-rates records with Companies House and HM Land Registry ownership data, aggregated and current for 2026. Floorspace figures reflect owner-matched empty commercial premises across the top 15 areas by floor area. Figures are approximate and directional; no names or row-level data are published.