Practical completion is the day the building stops being a site. Possession goes back to the client, the insurance of the works usually goes with it, the defects period starts, usually half the retention is released and the liquidated damages clock stops. All of it turns on one certificate, and the certificate turns on paperwork that most sites start gathering three weeks too late.
Written from the side of the desk that has to hand it all over, here is what the day needs and why.
The contract defines it, not the law
Practical completion is a contractual idea, and the standard forms each define it in their own words, so the first job is to read your own contract and write the definition out. The usual shape is that the works are complete except for minor items that do not prevent the building being used for its purpose, and that the documents the contract names as a condition have been delivered. That second half catches people: where the O&M manual or the as-built drawings are a condition of completion, an unfinished manual is an unfinished building.
No clause number is quoted in this guide or on the documents, because every contract is different. Ask the contract administrator what the test is; then meet it.
What the law does require on the day
Three things are statutory whatever the contract says.
The Building Regulations 2010 require notice of completion to building control and the completion certificate (or the approver's final certificate) to be requested; and notice that the fixed building services have been commissioned in accordance with the approved procedure — for dwellings, with the ventilation air-flow and air-pressure test results within the time the Regulations set. They also require the owner to be given the information needed to run the services and the ventilation efficiently, which is what the O&M manual and the building user guide are for.
The Regulatory Reform (Fire Safety) Order 2005 makes the occupier's responsible person answerable for the fire arrangements from the day they take the building, and the Building Regulations 2010 require fire safety information to be given to that person on completion. A fire alarm handed over without its four certificates to BS 5839-1:2025 — design, installation, commissioning and acceptance — or emergency lighting without its completion certificate and duration test to BS 5266-1:2016, leaves that person answerable for systems nobody has proved.
CDM 2015 regulation 12(10) requires the health and safety file to be passed to the client at the end of the project. The file is not the O&M manual: it is the residual hazards for whoever works on the building next, and it has its own template in the CDM bundle. On a higher-risk building the completion certificate comes from the Building Safety Regulator, and the golden thread passes to the accountable person under the Building Safety Act 2022 and the Higher-Risk Buildings (Keeping and Provision of Information etc.) (England) Regulations 2024 before anyone moves in.
The sequence that works
Walk the building yourself before you offer completion, area by area against the definition you wrote out, so the contract administrator's visit is a formality rather than a list. Agree the outstanding items and put a value against each; the schedule appended to the certificate stops the argument in month four about what was agreed.
On the day, hand over the keys, fobs and codes against a signature, read every meter with both parties present, and demonstrate the systems to the people who will run them. A building handed over without training has its controls overridden within a month and its warranties voided within a year, because nobody wrote down the servicing that keeps them valid.
Keep the register of warranties and certificates alive through the defects period, and close the period with a certificate listing every defect notified, whichever way it went.
What a template does not do
A handover certificate records what changed hands; it does not make the building complete or certify practical completion, which is the contract administrator's to give. A commissioning completion certificate lists the result sheets; it is not the commissioning. The competent people who tested, witnessed and signed are the evidence, and no document makes anyone compliant. Why we will never call a document "compliant".
Documents for this work
- The handover and completion bundle — all twelve documents
- Practical Completion Inspection Checklist
- Handover Certificate — Keys, Fobs, Access Codes and Asset Schedule
- O&M Manual Contents Schedule and Compilation Checklist
- Fire and Life-Safety Systems Handover Certificate
- Outstanding Works Schedule at Practical Completion
- End of Defects Period Inspection and Making-Good Certificate
- Handover Evidence Checklist — the close-out records already in the quality range
- The CDM 2015 bundle — the health and safety file the handover passes to the client