The Paperwork That Outlives the Build: What to Collect Before the Scaffolding Comes Down

The scaffolding comes down, the skip goes, and attention moves swiftly to furniture and flooring. This is precisely the moment at which the most valuable part of a project is at risk of being lost. The handover file is not administration for its own sake. It is the evidence base that makes a property saleable, insurable and enforceable for the next decade.

A well-run contractor expects to produce it. A contractor who is vague about certificates, drawings and guarantees is telling you something useful about how the rest of the work has been managed.

Why the final five per cent matters

Almost every problem that surfaces after completion is decided by what was collected before the last payment. A defective cable becomes your cost if no test certificate exists. A failed roof membrane becomes your cost if the manufacturer's guarantee was never registered. A buyer's solicitor will ask for Building Regulations evidence on an extension, and a missing completion certificate can hold up a sale for weeks.

Statutory documents

Building Regulations completion certificate. Issued by Building Control — either the local authority or a registered approved inspector — not by the builder. It follows a final inspection of the works and covers extensions, loft conversions, structural alterations, drainage, replacement windows and boiler replacements. If you are told it is 'in hand', establish who applied, on what date, and what remains outstanding.

Planning evidence. Decision notices, and the discharge of conditions where a Conservation Area or listed building consent applied. Keep copies of approved drawings; they are the reference point if a later dispute arises over what was built.

Trade certification

Electrical. For notifiable work in England and Wales, expect an Electrical Installation Certificate or a Minor Electrical Installation Works Certificate, together with the schedule of test results. Where a competent person scheme was used, the building regulations notification should also be provided.

Gas and heating. A Benchmark commissioning checklist for a new boiler, the gas safety and installation record, and confirmation that the manufacturer's warranty has been registered. Unvented cylinders and heat pumps carry their own commissioning records and, in the case of renewable installations, MCS certification.

Other trades. FENSA or CERTASS registration for replacement glazing, a CCTV drainage survey where drains were altered, and any timber treatment or damp guarantee, which are typically insurance-backed and transferable.

Warranties and guarantees

Distinguish between three different things. The structural warranty, if you have one, runs for ten years and is usually provided by a specialist insurer. The contractor's own workmanship guarantee is commonly twelve months, sometimes longer. Manufacturer guarantees cover products — roof tiles, render systems, flat roof membranes, sealants — and often require registration within a set period of installation.

Check each document for transferability. A guarantee that cannot be assigned to a buyer is worth considerably less than one that can.

Drawings and records

Request as-built drawings showing service routes, steel positions and drain runs, ideally with depths. Add the operation and maintenance manuals for boilers, ventilation and heating controls, product data sheets, paint colours and codes, tile and flooring references, and a note of any spare materials left behind. A simple maintenance schedule, listing gutters, seals and ventilation filters, will repay the effort.

The snagging schedule and retention

A snagging list should be written, dated and signed by both parties, with a remedy date against each item. Verbal assurances do not survive a change of personnel. Where the contract allows, hold retention until the list is cleared; two and a half to five per cent is typical.

If items are missing

Put the request in writing, itemise what is outstanding, and set a reasonable deadline. Do not release the final payment or retention in exchange for promises. If the completion certificate is absent, contact Building Control directly — you can apply yourself, and a regularisation certificate may be available where work was carried out without approval. For electrical or gas concerns, the relevant competent person scheme can confirm whether the work was notified.

Completion checklist

• Building Regulations completion certificate
• Planning decision notice and discharge of conditions
• Electrical installation certificate and test schedule
• Building Regulations notification for electrical work
• Boiler Benchmark checklist and gas installation record
• Manufacturer warranty registrations confirmed in writing
• Structural warranty or architect's certificate
• Workmanship guarantee, with transferability confirmed
• FENSA or CERTASS certificate for glazing
• Drainage survey and any damp or timber guarantees
• As-built drawings, including service routes
• Operation and maintenance manuals
• Signed snagging schedule with remedy dates
• Retention terms and release conditions
• Contact details for each trade, for future reference

Collect it before the final payment clears. It is considerably easier to ask a builder who is still on site than one who has moved to the next job.