Construction deals come in two forms. In the first, someone buys a contractor, consultancy or engineering business, and the room looks much like any company sale, with a long tail of project risk attached. In the second, someone buys, funds or lets a building, and the room has to prove how that building was designed and built. Both depend on the same paperwork: a chain of contracts, and the warranties that let people outside that chain bring a claim.
The warranty web
The employer appoints designers and signs a building contract; the main contractor subcontracts key packages. Funders, purchasers and tenants were never parties to those contracts, so they rely on collateral warranties or rights under the Contracts (Rights of Third Parties) Act 1999 to sue if the work proves defective.
The web of contracts and warranties behind a building
A buyer’s solicitor will check that every warranty promised in the building contract was actually given, in the agreed form, by the right entity, and that the professional indemnity insurance behind it was maintained. A missing warranty from a structural engineer can hold up a sale or a refinancing on its own. File the room so that each project folder contains the contract, the appointments, the subcontracts and all warranties together, rather than in separate folders by document type.
Whether a contract was signed as a deed also matters. Claims under a simple contract generally expire six years after breach, while a deed extends that to twelve. Make sure the signed, dated versions are in the room, not the drafts.
What goes in the room
| Area | Selling a contractor or consultancy | Selling or funding a building |
|---|---|---|
| Contracts | Live project contracts, frameworks, bonds and guarantees | Building contract, appointments, subcontracts |
| Warranties | Warranties the business has given to others | Warranties and third party rights in favour of the owner and its successors |
| Disputes | Adjudications, claims, final account negotiations | Defects, snagging, latent defects insurance |
| Money | Retentions held and owed, work in progress, cash flow by project | Final account, retention release, service charge history |
| Safety | Health and safety records, accident reports | Fire strategy, building safety information, operation and maintenance manuals |
| Tax | CIS returns and gross payment status | Capital allowances analysis |
Building safety and the golden thread
The Building Safety Act 2022 changed diligence for residential buildings. For higher-risk buildings, broadly those at least 18 metres or seven storeys tall with at least two residential units, there are duties to keep accurate building information up to date, often called the golden thread, and to deal with the Building Safety Regulator. A buyer of such a building, or of a contractor that has worked on them, will ask for that information early. The room can hold it, but it is not a substitute for the owner’s own system: upload a snapshot with the date it was taken.
Money held and money owed
Contractors live on cash flow, and buyers want to see it project by project: valuations, payment notices, retentions held by employers and retentions held from subcontractors, and any adjudication decisions under the Housing Grants, Construction and Regeneration Act 1996. Tax advisers will look at records under the Construction Industry Scheme, including monthly returns and whether the business holds gross payment status, because errors can produce liabilities that survive the sale.
Where construction rooms go wrong
The usual problems are volume and version control. Drawing sets run to thousands of files, and uploading every revision buries the final as-built set. Upload the as-built drawings and the latest revisions, and keep superseded sets in a clearly marked archive folder. Other mistakes include separating warranties from the contracts that require them, omitting bond and guarantee documents, and leaving dispute files open to every bidder when only lawyers need them.
Budget
A single completed building with a tidy file may need only a modest monthly plan. A contractor sale with many live projects, or a building with a large drawing library, will test storage limits, so ask how data volume affects price before you upload. Our cost guide explains the pricing models, and our commercial property page covers the property transaction itself.
Running a contractor sale or a building disposal? The quiz narrows the field by data volume, team and deal type.
Take the quizQuestions people ask
What is a collateral warranty?
A contract in which a designer or contractor promises a third party, such as a funder, purchaser or tenant, that it has performed its own contract properly, giving that third party a direct right to claim if it has not.
Should drawings go in the data room?
Yes, but the as-built set and latest revisions, not every superseded version. Mark archive folders clearly so reviewers know what is current.
Does the Building Safety Act affect every building sale?
Its heaviest duties apply to higher-risk residential buildings, but buyers and lenders now ask building safety questions on many residential and mixed-use deals. Take advice on whether your building is in scope.
How long do construction deal rooms stay open?
A building sale is often quick; a contractor sale with many live projects can take months. Keep an archive copy after completion, because warranty and limitation periods can run for years.