Building regulations completion certificate
What a completion certificate proves and why it matters when selling or remortgaging.
Short answer
What a completion certificate proves and why it matters when selling or remortgaging.
For the planning permission side, use UKPlanningGuide. Keep that separate from building regulations approval and completion evidence.
What usually triggers extra checks
- Structure, fire safety, drainage, insulation, ventilation or controlled services
- Work already started or completed without clear records
- Missing certificates or unclear handover evidence
- Anything involving flats, higher-risk buildings or work outside England
Route options to discuss
Compare full plans, building notice, competent person self-certification, regularisation and specialist advice. The right route depends on risk, timing, drawings, installer registration and what building control wants to inspect.
Evidence to keep
- Application references and notices
- Drawings, specifications and calculations
- Inspection dates and site photos before cover-up
- Completion certificate, competent person certificate and commissioning records
Mistakes to avoid
Do not assume planning permission, permitted development or a builder's quote answers the building regulations question. Do not cover up work before required inspections. Do not rely on a certificate claim without checking who issues it and how you will receive a copy.
Common questions
Can I rely on this without contacting building control?
Use it as preparation, not permission. If the work is controlled or uncertain, confirm the route with building control, a registered approver or the competent person responsible for the work.
When is a general homeowner guide not enough?
Get specialist input where flats, higher-risk buildings, structural uncertainty, fire safety, public sewers or work outside England are involved.