Derelict Buildings and Brownfield Land for Sale: How Developers Find, Value and Buy Them

Where derelict buildings and brownfield land for sale come from

Most buyers search the portals first. They find a handful of tired listings, priced for the seller, and wonder where the real sites are. The answer is that derelict buildings and brownfield sites move through six channels, and the portals see the least of them.

Brownfield land registers: the free list most buyers ignore

Every local planning authority in England, including each London borough, must keep a brownfield land register. Part 1 lists previously developed sites the council considers suitable for housing, with or without permission. Part 2 lists the sites it has granted permission in principle.

The registers are reviewed at least once a year and published as open data, usually on the council's planning pages. They are the most useful free list of brownfield land for sale near you. Many entries are not for sale yet, but every one has an owner who can be approached.

Off-market: the route the best sites take

Off-market deals come through people who are already on sites. A contractor next door hears the owner wants out. A lender has a scheme that stopped at the frame. A consultant knows a club has closed for good. That is why a sourcing partner should be judged by their live projects, not their mailing list.

How to value a derelict building or brownfield site

Here is the rule that saves most buyers from overpaying. A derelict building or brownfield site has no value of its own. It is worth what is left of the finished scheme's value after every cost of getting there.

Start with the gross development value (GDV): what the finished homes or space will sell or let for, from real local comparables. Deduct the build cost, the professional fees, the finance, the planning obligations and the profit you need. What remains is the most you can pay for the land.

On a derelict or brownfield site, the line that breaks appraisals is the abnormals. These are the costs a clean, empty plot would not carry:

1. Demolition and clearance. Old structures, slabs, foundations and basements to remove before work starts.
2. Contamination. Fuel tanks, made ground and industrial residues to investigate, remove or contain.
3. Asbestos. Common in buildings of a certain age; it needs a survey before any strip-out.
4. Services. Power, water and drainage capacity, and redundant services to divert or remove.
5. Structure. What can be kept, and what a survey shows once the building is opened up.

These lines are why "brownfield land is cheaper" is a trap. A low price per acre with heavy abnormals can leave less profit than a dearer clean site. The full method is in our development appraisal and feasibility study. Our guide to abnormal costs in construction lists them line by line.

A real appraisal: four schemes on one derelict building

At 74 Allitsen Road in St John's Wood, a derelict former members' club was bought at auction with a £2,750,000 guide. Our feasibility study then designed and costed four schemes on the same building.

Option 3 reached 97% of the maximum GDV at 91% of the maximum cost. Digging the basement would have added about £240,000 and three months for one flat worth £260,000 to £350,000. We advised against it.

Planning for brownfield land: registers, permission in principle and change of use

Planning decides what a derelict building or brownfield site is worth. Brownfield land development has a head start in England, but only if you read the planning position before you bid.

Permission in principle is the first stage of a two-stage route for housing-led schemes. It settles whether the site suits housing in principle. The detail follows in a second stage, called technical details consent.

A site on Part 2 of a brownfield land register already has permission in principle, by default for five years. A minor scheme can also apply for it directly, by default for three years. Major development is excluded from that application route.

Change of use, lawful use and vacancy history

Most derelict buildings in London are not empty plots. They are former clubs, pubs, offices, works and warehouses. Turning one into homes usually needs a change of use, and some uses have no easy route out.

At Allitsen Road, the club was a sui generis use with no automatic route to residential. The council expects sustained evidence that the old use is dead. The study planned for 12 to 18 months of marketing evidence inside the deal.

Two more checks belong here. A listed building needs consent for demolition, or for any alteration or extension that affects its character. A conservation area limits what can change outside. Our guide to buying land with planning permission covers the consented side.

Real examples: a club, a quarry and a record factory

Derelict buildings and brownfield land come in every size. These three show the range, and what made each one work.

1. Allitsen Road, St John's Wood. A vacant former private members' club on a corner plot, bought at auction in 2026 without proper due diligence. Our study turned it into a £6M scheme of flats, with four options costed. See the Allitsen Road feasibility study.
2. Holborough Lakes, Snodland. A Blue Circle chalk quarry in Kent, bought by Berkeley without planning permission. Robert Barton, now our Development Director, secured the masterplan for 1,100 homes there before he joined Craftex. See Holborough Lakes, from quarry to homes.
3. The Old Vinyl Factory, Hayes. The former EMI works in west London, many buildings boarded up by 2011. Robert Barton led the bid for the 18-acre site, bought that April for £16m. See The Old Vinyl Factory regeneration.

At Holborough, the lakes left by the quarry became the centre of the scheme and gave it its name. In 2015 it won Silver for Best Brownfield Development at the WhatHouse? Awards.

At Hayes, the masterplan was approved in November 2012: 1.5m sq ft of mixed use, including 642 homes. The first residential plot, 134 apartments, was sold to a build-to-rent operator. That brought money in before the main build.

The lesson from all three is the same. The value was made at the planning and appraisal stage, before anyone built anything. The buyers who won knew what the site could become before they paid for it.

The traps: contamination, listing, squatters, knotweed and VAT

Every derelict building hides something. Price each of these traps before exchange.

1. Contamination. Old works, garages and depots leave fuel, made ground and residues. A company that buys land already contaminated or long-term derelict may claim Land Remediation Relief, a 150% deduction on qualifying clean-up.
2. Listed status. Demolition, or works that affect a listed building's character, need listed building consent. Check the national list before you bid, not after.
3. Squatters and security. Squatting in a residential building is a crime, punishable by up to six months in prison. In a non-residential building it is not in itself a crime, so empty commercial buildings need security from day one.
4. Rights of way and title. Footpaths, covenants and ransom strips can block the scheme. Read the title, not the brochure.
5. Japanese knotweed. There is no legal duty to remove it unless it causes a nuisance. But you can be prosecuted for letting it spread into the wild, and the soil may be controlled waste.
6. VAT on the price. Land and commercial buildings are normally exempt, but a seller who has opted to tax charges VAT. If you will convert the building to homes, a certificate from you (form VAT1614D) can let the seller treat the sale as exempt.

Each is cheaper to find before you own the site. Our development site due diligence checklist sets out the order to run them.

How we find and test derelict sites for buyers

We work for the buyer, not the seller, on development schemes from £3M to £150M GDV, in London and across the UK. Our development land and site sourcing service handles the whole buying stage as your representative.

1. Deal flow. We are in the industry and active on projects, so off-market deals come to us. We already have deals on the table.
2. The numbers. We run the full appraisal and viability check, so you know the most you can pay before you bid.
3. The planning chance. Without consent, we advise on the odds. With consent, we check the numbers and the conditions for you.
4. The risks. Every abnormal and every trap highlighted before you commit.
5. The terms. We negotiate on your behalf and structure the deal around your strategy.

What we ask of a buyer

After the purchase, the same team can take the scheme on through planning, design and construction. Terms are agreed deal by deal: a fee basis, a percentage, or joining the deal. We ask serious buyers to have proof of funds, or funding in place. For the wider process, read our guide to land acquisition for development.

A derelict building is only a bargain if you know what it can become. Found one, or want us to find one? Send us the address and we will tell you what it is worth to develop.