Garage conversion before and after checklist: record the work

Photograph and record the garage before work, at important concealed stages and after handover. Capture existing condition, dimensions, approvals and drawings; then record floors, membranes, insulation, supports, cables, pipes, drainage and ventilation before finishes hide them. Finish with certificates, warranties, invoices, final photographs and a dated snagging record.

Before work: establish the baseline

Take wide and close photographs of the garage door, walls, floor, ceiling, roof, meters, consumer unit, drainage, cracks, damp marks, external ground levels and adjoining rooms. Include a scale or note showing where each image was taken. Record internal length, width, headroom, floor level, thresholds, openings and anything that must remain accessible.

Keep the quotation, specification, room layout, planning documents, building-regulations information, drawings and structural calculations together. The main checklist can help assign responsibility for each decision. If the garage is old or contains suspect materials, record the finding and stop before disturbance.

During work: photograph what will be hidden

Before each layer covers the last, record the foundations and door infill, damp-proofing, insulation, structural steel or lintels, electrical first fix, plumbing, drainage, ventilation ducts, floor build-up and wall or roof build-up. Use a tape measure where position matters, and take a wider image showing the feature’s relationship to the room.

These photographs help with future maintenance and comparison with drawings, but they are not inspection certificates. Tell building control when work is ready for inspection and keep its records. Ask the electrician, gas engineer or other competent person for certificates. A photo of a cable route cannot replace testing.

After work: close the project file

• Take final photographs of the finished room, external frontage, doors, windows, floor transitions, meter access and ventilation terminals.
• Keep the completion certificate, electrical or other specialist certificates, guarantees, warranties, invoices and approved drawings.
• Record product names, colours, paint references, appliance details and maintenance instructions while they are easy to find.
• Compare the finished room with the scope and create a dated snagging list before treating the project as complete.

The snagging guide focuses on defects and handover. This checklist adds the evidence that should exist before the defect list begins.

Make the record useful later

Use a consistent file name such as 2026-08-09 floor insulation north wall and keep a simple index of documents and photographs. Store a copy with the property records. When planning a future alteration or answering a buyer’s question, a short evidence trail is more valuable than hundreds of unlabelled images.

Good records do not prove every detail is compliant and do not replace a survey or professional advice. They do make the project easier to inspect, explain, maintain and hand over. The buyer guide shows why that clarity matters when the property changes hands.