Finishing a building project properly: snagging, certificates and handover

A planned handover brings the work, paperwork and everyday operation together. Start preparing it before the contractor's final days on site so each outstanding item has a person responsible and a clear next step.

Understand what “complete” means on your project

There are several related milestones: completion under the building contract, the building-control completion process, delivery of operating information and agreement of the final account. Do not assume one email or invoice settles all four.

Where your contract uses practical completion, its meaning and consequences depend on the contract and circumstances. It can affect matters such as possession, payment and the start of a defects or rectification period. Ask the person administering the contract to explain the provisions that apply to your job. JCT: practical completion.

Building-control certification concerns compliance with building regulations within that process. It is not a general guarantee that every item of workmanship is satisfactory or that the builder has completed every contractual obligation. The Local Government and Social Care Ombudsman explains the limits of the council's building-control role. LGSCO: building control.

Knowing these distinctions makes the final conversations more precise. Instead of asking whether the project is “signed off”, ask which milestone is complete and what evidence confirms it.

Arrange a walkthrough with enough time to use the rooms

Agree a date with the contractor and, where appointed for that role, the contract administrator or relevant consultant. Ask for the rooms to be sufficiently clear and clean to inspect the work.

Bring the agreed specification, relevant drawings and the record of authorised changes. These provide the basis for checking what was included. An expectation that was never part of the agreed scope needs a different conversation from an item installed incorrectly.

Work through the house systematically, including areas disturbed by access or service alterations. An extension handover may need to consider the hallway, driveway and garden as well as the new room.

Allow time to operate doors, windows, cupboards and controls normally. Look at finishes in reasonable lighting and discuss any applicable specification or inspection criteria. Avoid relying solely on hurried photographs after everyone has left.

Record observations you can describe clearly

Use one list with an identifier for each item. Record its location, what you observed, a photograph reference if helpful, who will respond, the agreed action and target date.

For example, an illustrative entry might be: “S07, kitchen, left garden-door leaf catches at the lower corner during normal operation. Contractor to arrange installer inspection and adjustment; date to be agreed.”

That is more useful than “doors bad”. It describes the symptom without guessing which part of the installation caused it.

Keep each issue separate. A marked cupboard door and a missing ventilation commissioning record need different responses, even if both relate to the same room. Record when an item has been checked after the work is done, rather than deleting it as soon as someone says it has been addressed.

Deal with urgent concerns promptly

Not every outstanding item belongs on a routine snagging list. A suspected safety problem, active leak or significant failure affecting use needs prompt attention through the appropriate professional or emergency route.

Do not dismantle electrical equipment, open gas appliances, enter unsafe roof areas or improvise structural checks as part of your walkthrough. Report concerns and have the relevant competent person investigate.

Ask the contractor or consultant to explain priorities and any restrictions on use. A cosmetic mark, an operational defect and a suspected safety issue should not all wait for the same general return visit.

Keep the record factual, including any advice received. If an issue is disputed, follow the agreed contract procedure and obtain appropriate advice rather than relying on an informal promise or unilateral repair arrangement.

Close out the building-control process

Confirm who is arranging the completion inspection and what information remains outstanding. Ask the building control body for the requirements applicable to your project and application route.

These may include commissioning records, test results, design information, responses to earlier inspection issues and the required dutyholder declarations or completion notices. Establish who must provide each item and when.

The document issued will depend on the route, such as a local authority completion certificate or the relevant final certificate from a registered building control approver. Keep the issued document and check that the address and description correspond to the work. GOV.UK: building regulations applications.

Do not assume that the last inspector's visit automatically completes the paperwork. If something remains open, request a clear list and arrange for it to be resolved while the project team and records are readily available.

Collect the installation records separately

Some work is carried out through authorised competent person schemes. The relevant installer may self-certify and arrange notification for that work, with separate compliance documentation. Keep those records alongside the main building-control documents. GOV.UK: competent person schemes.

For electrical work, ask for the appropriate electrical installation or minor works certification and, where applicable, the separate building regulations compliance certificate. These serve different purposes. Electrical Safety First, for example, distinguishes the installation and compliance certificates for a replacement consumer unit. Electrical Safety First: certification questions.

For heating, hot water, ventilation and other systems, obtain the applicable installation, commissioning and compliance records from the responsible people. Match them to the equipment actually installed and check any registration or warranty actions required of you.

Treat a missing document as an identifiable outstanding item, with a named person and follow-up date. A product brochure is useful information, but it is not evidence that a particular installation was tested or commissioned.

Ask for a demonstration, then operate it yourself

Have the installer show you the ordinary controls for heating, hot water, ventilation, alarms and any powered rooflights or shading. Then use the controls yourself while they are available to answer questions.

Ask how the systems behave during normal use, holidays and a power or internet interruption where relevant. Confirm which settings should be left alone and what you should do if a warning appears.

Locate the main water stop valve and any relevant accessible isolation points. Ask the professionals to identify them safely and explain their purpose. Keep the information in the house's operating records.

With permission, short videos of demonstrations can be useful. Keep the written instructions too, especially maintenance schedules and procedures that should only be undertaken by a qualified person.

Build a handover folder you can actually use

Organise the records by purpose rather than leaving one large collection of email attachments. A practical set contains:

• Approvals: planning decisions, relevant condition decisions and building-control documentation.
• Design: final relevant drawings, specifications, structural information and recorded changes.
• Installations: test certificates, commissioning records and equipment details.
• Operation: user instructions, demonstrated settings and maintenance requirements.
• Commercial records: contract, authorised variations, invoices, warranties and relevant contacts.
• Outstanding work: the current snag list, responsibilities, dates and confirmation of completed actions.

Not every project requires every document. Ask the responsible professionals which records should exist for your scope and retain them in a durable, backed-up location.

Label useful construction photographs by room and date. Images of concealed work may help future maintenance, but they do not replace accurate records or professional checks before drilling or alteration.

Reconcile changes and payments through the contract

Compare the final account with the original agreement and authorised variations. Identify omissions, additions and any agreed adjustments. Ask for unclear entries to be explained with the relevant records.

Follow the contract's payment, notice and dispute provisions. Do not assume you can withhold a chosen percentage until every snag is finished, or that paying an invoice automatically settles an unresolved issue. Get advice where the amount or entitlement is disputed.

Confirm any agreed retention, defects-period arrangements and responsibility for return visits. Record access arrangements for those visits so outstanding work can be completed without repeated missed appointments.

Plan for the first months of use

Ask about drying, ventilation and decoration aftercare for the materials used. Follow the relevant instructions rather than applying a generic timetable to every finish.

Note service and warranty dates, and ask whom to contact if a problem appears later. Keep records of symptoms and the advice received. New or changing movement, water ingress or other significant concerns should be assessed rather than automatically attributed to normal settling.

Your handover checklist

• The walkthrough and outstanding-work record are complete.
• Urgent concerns have been addressed through the appropriate route.
• The contract's completion position is understood.
• The building-control completion process is complete or has a clear action list.
• Applicable installation and commissioning records have been received.
• Controls, maintenance and relevant isolation points have been explained.
• Final design information, warranties and contacts are organised.
• The final account and any remaining obligations are being handled under the contract.

Ask CR Design Services about the scope of support you want during construction and handover when appointing the team. Clear responsibilities for inspections, contract administration and document coordination help the project reach a properly organised finish. Discuss project support.

Guidance for homeowners in England. Contract procedures and certification requirements depend on the project. Reviewed 8 September 2026.