Commercial property due diligence

Commercial property due diligence is the structured investigation a buyer carries out before committing to a purchase, to confirm that the building can legally and physically do what they intend and that the price reflects reality. On industrial stock it carries more weight than on a house, because industrial land has often passed through several uses and owners, title and planning are more complicated, and the physical risks, roofs, floor slabs and contamination, are larger. Done properly it is the cheapest insurance in the whole transaction; skipped or rushed, it is the source of almost every expensive surprise.

This guide sets out the four workstreams of commercial due diligence, legal, physical, planning and financial, the checklist within each, the particular care that let property and auction lots demand, and how the findings feed directly into the finance. It expands the diligence section of our pillar guide to how to buy an industrial unit. We arrange the funding as a broker and introducer, working from the same evidence your professional team produces; we are not a lender, solicitor or surveyor, and nothing here is legal, financial or tax advice. The point of this guide is to help you instruct the right people and ask the right questions.

What is commercial property due diligence?

Due diligence is the buyer's investigation of the property before exchange, the period when questions can still change the price or stop the deal. It runs as several workstreams at once: legal diligence on ownership and rights, physical diligence on the building, planning diligence on what the property may lawfully be used for, and financial diligence on whether the numbers stack up. The four feed each other, a planning restriction affects value, a survey finding affects the price, a title problem affects the funding, so they are best run in parallel under a solicitor who coordinates them.

The discipline matters most because of when risk passes. On a private treaty sale the buyer is free to renegotiate or walk away right up to exchange of contracts; after exchange the deal is binding and the property's problems are the buyer's problems. On an auction lot, covered in our guide to buying commercial property at auction, exchange happens on the fall of the hammer, so all of this diligence must be complete before the sale. Either way, the rule is the same: investigate before you are committed, not after.

Due diligence buys you the right to change your mind. Once contracts exchange, every problem the survey, title or planning register would have shown becomes a problem you own.

1. Instruct your team and start the searches

   Appoint a commercial property solicitor and a surveyor who know industrial stock, and get the local authority, environmental and water searches running, because they take weeks to come back.

2. Investigate title and the lease

   Check ownership, boundaries, covenants, access and yard rights, and where the unit is let, rebuild the income from the actual tenancy schedule rather than the marketing summary.

3. Survey the building and its risks

   Commission the building survey of roof, frame, slab and services, and the asbestos and environmental reports older industrial stock needs.

4. Confirm the lawful planning use

   Verify the use class on the council's online register, not the brochure, and read any conditions that narrow what the unit can do.

5. Size the finance against the evidence

   We model the loan against the same survey, income and planning findings as they emerge, so the funding matches the asset the diligence reveals.

6. Resolve every query before exchange

   Clear or price every outstanding point before contracts exchange, because after exchange the property's problems are yours to keep.

What does legal due diligence cover?

Legal diligence is your solicitor's investigation of the title and the rights that come with it. It starts with confirming the seller owns what they are selling and checking the title register and plan for the boundaries, then examines restrictive covenants, rights of way and shared access over the yard, easements for services, and any overage or clawback clauses a previous developer may have left that could claim a share of future value. Industrial titles carry these complications more often than residential ones, and they take longer to resolve than buyers expect.

The searches sit alongside the title. A local authority search reveals planning history, enforcement notices, road schemes and whether an Article 4 direction has removed permitted development rights. An environmental search flags contamination risk and flood exposure. A drainage and water search confirms connections, and a chancel or commons search may be relevant in places. Replies to the standard commercial property enquiries fill in the rest, from VAT and the option to tax through to disputes, notices and statutory compliance.

Where the unit is leasehold, the lease itself becomes a major piece of work, because its length, ground rent review pattern, service charge and use and alterations clauses all affect value and lender appetite. Our guide to freehold versus leasehold commercial property covers the tenure questions in detail. A solicitor who works on industrial transactions weekly will spot the covenant, access and overage problems that a generalist can miss.

What physical and environmental checks does an industrial unit need?

Physical diligence is the survey and the specialist reports behind it. On an industrial unit the structural priorities are the roof, the steel portal frame, the floor slab and the building services, because these are the elements that cost real money to put right and that an untrained eye underestimates. A building survey by a surveyor who knows portal-frame sheds will price roof works, slab cracking and cladding condition within a sensible margin rather than guessing, which is exactly the information a buyer needs to adjust an offer or budget for repairs.

Environmental diligence is just as important on industrial land and is frequently underdone. Older stock should have its asbestos register checked and an asbestos survey commissioned where one is missing, because asbestos remains common in industrial buildings of a certain age. The environmental search and, where it flags concerns, a fuller contamination assessment matter because industrial land carries genuine contamination history from previous uses, and a lender's valuer will probe it. Energy performance completes the picture: an industrial unit generally needs an EPC rating of E or better to be let under the minimum energy efficiency standard, and the government has consulted on tighter future targets, an expected direction of travel rather than settled law, so price any upgrade works into the offer.

Why does planning sit at the centre of due diligence?

Planning diligence confirms what the property may lawfully be used for, which is not the same as what the brochure says or what the current occupier does. A valuer values the lawful use, and a lender lends against that valuation, so a unit being run as something its planning does not permit will be valued and funded on the lawful position, and any premium from the unauthorised use disappears from the loan. Confirming the use class is therefore a financial check as much as a legal one.

Most industrial uses sit in class B2 for general industrial or B8 for storage and distribution, with lighter uses in class E(g) since the 2020 reforms moved former B1 light-industrial there. The way to verify the position is the council's online planning register, which shows the permission history, the conditions attached, any enforcement notices and whether an Article 4 direction has stripped permitted development rights from the area. Conditions deserve particular attention, because a consent that limits operating hours, restricts the use to a named operator or controls vehicle movements can quietly narrow the market for the asset. Our guide to industrial planning use classes sets out the categories and the change-of-use rules in full.

Where the lawful use is unclear, or where a current use relies on the passage of time to have become lawful, the formal answer is a certificate of lawfulness, decided on evidence rather than planning merit. Assembling that evidence before a sale is far easier than during one, because a lender's solicitor will raise lawful use enquiries as standard and an unanswered enquiry stalls the whole transaction. Planning is best treated as a price and finance variable, not a formality to clear at the end.

What extra diligence does let or investment property need?

When the property is bought as an investment with tenants in place, the tenancy schedule becomes the heart of the diligence, because you are buying an income stream as much as a building. Rebuild the income from the actual leases rather than the marketing summary: confirm the passing rent on each unit, the lease length and break clauses, the rent review pattern and dates, the repairing obligations, and any rent-free periods or incentives still running. A reversion behind a long lease with no near review is a wait, not a windfall, and an estate let off rents agreed at the top of a local spike may quietly be over-rented.

Tenant covenant strength is the next layer. A unit let to a national operator on a long lease prices and funds very differently from the same unit let to a young company on a short term, because the lender is asking how reliably the rent will be paid and how easily the unit would re-let on a default. Check the service charge accounts for the last three years on managed estates, because they reveal what the estate actually costs to run and whether a major item such as road resurfacing is about to land on the new owner. The income and tenant detail then feeds straight into the interest cover the lender will calculate.

For multi-let estates specifically, the diligence is more involved because there are more leases, more tenants and a service charge regime to understand, all covered in our guide to multi-let industrial estates. The discipline is the same as for a single unit, just repeated line by line across the schedule, and the differences between the agent's figure and your own rebuilt figure are usually where the real negotiation lives.

How does due diligence feed into the finance?

Diligence and finance are not separate exercises, because the lender repeats much of your diligence through its own valuer and solicitor. The valuation is instructed under the RICS Red Book and is sized against the lawful use, the actual income and the building's condition, so a planning restriction, a sub-E EPC or a roof problem your survey found will also affect what the lender will advance. Sizing the loan against the price you agreed rather than the valuation the lender will produce is one of the most common financing mistakes, and good diligence is what closes the gap between the two.

Starting the funding workstream early, alongside the legal and physical diligence rather than after it, is what keeps the timetable honest. A buyer with finance terms agreed in principle can move quickly when diligence comes back clean and can renegotiate or withdraw when it does not, while a buyer who leaves the mortgage application until contracts are deep in negotiation invites delay. We model the loan against the same evidence your team produces, which is why we ask for the tenancy schedule, the survey summary and the planning position as they emerge rather than at the end.

Where diligence reveals a problem that needs time to fix, a planning consent to obtain, refurbishment works to complete, a lawful use to regularise, the funding structure adapts. These deals are often completed with bridging finance against the asset as it stands, then refinanced onto a commercial mortgage once the issue is resolved and the value supported. The pillar guide on how to buy an industrial unit sets out the funding routes; the point here is that diligence findings shape which route fits.