Starting a home project?
Make sure you know which certificates & compliance documents you need — and which to keep safe for resale and council checks.
Quick Answer: Certificates & compliance documents are the official paperwork proving your project meets UK planning and building regulations. Councils, lenders and future buyers will often require them. Missing documents can delay sales, cause enforcement notices or invalidate insurance.
Overview – Why Certificates & Compliance Documents Matter
Every building project leaves a paper trail. Councils, mortgage lenders and future buyers want proof that your extension, loft conversion or major alteration followed the rules. Certificates & compliance documents provide that proof.
Key Certificates & Compliance Documents in the UK
The main documents homeowners encounter include:
- Planning Permission Decision Notice – issued by the council confirming approval.
- Lawful Development Certificate – proof that work falls under Permitted Development.
- Building Regulations Completion Certificate – issued by Building Control after final inspection.
- Building Notice / Full Plans Approval – confirmation of compliance route chosen.
- Electrical & Gas Certificates – e.g. Part P, Gas Safe compliance.
- Energy Performance Certificate (EPC) – required on sale or let.
- Completion & Compliance Letters – from councils or private inspectors.
When Certificates Are Needed (Planning vs Building Control)
Not all projects need planning permission, but most need Building Regulations approval. Certificates confirm:
- Planning Stage: Certificate of Lawfulness or Planning Approval Notice.
- During Works: Interim inspection reports from Building Control.
- After Works: Completion Certificate from the council or approved inspector.
Not sure if your project has the right paperwork?
We’ll review your documents and advise if anything is missing before it becomes a problem.
Council Quirks & Local Variations
While national rules apply, every council interprets documentation requirements slightly differently:
- Buckinghamshire: More rigorous on heritage checks, often request extra compliance reports.
- Milton Keynes: Known for strict Building Control sign-off timelines — delays can stall completion certificates.
- Guildford: Council often asks for energy efficiency certificates alongside Building Regulations sign-off.
How Long to Keep Certificates & Records
Homeowners should keep all compliance paperwork for the life of the building. At minimum, keep:
- Planning & Building Certificates: Indefinitely.
- Gas & Electrical Certificates: Until replaced by a newer safety check.
- Completion Certificates: Always — essential for selling or remortgaging.
Costs, Timelines & Penalties
Certificates are usually included in planning or Building Control fees. However, costs vary by council:
- Planning certificates: £100–£300 (application fees).
- Building Control Completion Certificate: Included in inspection fee, typically £500–£900 for extensions.
- Specialist compliance (gas, electrics): £50–£200 each.
Timeline: Most certificates are issued within 2–8 weeks of works completing, but delays happen if inspections are missed.
Frequently Asked Questions
What is a compliance license?
In UK housing, a compliance “license” usually refers to official approval (planning or Building Control) showing that your project meets regulations.
What is compliance paperwork?
It’s the collection of certificates, decision notices and inspection reports proving you’ve met legal requirements.
What documents prove building compliance?
A Building Regulations Completion Certificate is the most common proof, along with electrical and gas certificates.
Do I need certificates when selling my house?
Yes. Solicitors and buyers will ask for compliance documents. Missing certificates can delay or derail sales.
How do I replace lost compliance documents?
Contact your local council’s Building Control or Planning department. They can provide copies, usually for a small fee.
Ready to move your project forward?
Plans Made Easy can prepare compliant plans, manage submissions, and guide you from idea to approval.
Garage Conversions (UK): Permissions, Costs & Process
Thinking of converting your garage? Discover if you need planning permission, how Permitted Development works, and what Building Regulations demand. This complete UK guide covers realistic costs, council quirks, step-by-step process, and value impacts, so you can confidently plan your garage conversion and secure approvals without costly mistakes.
Certificates & Compliance Documents You Must Keep (UK Home Projects Guide)
Certificates & compliance documents prove your home project meets UK planning and building rules. From completion certificates to gas and electrical sign-offs, missing paperwork can cause delays, enforcement or issues with selling. This guide explains which documents you must keep, local council quirks, costs, and how to replace lost certificates.
Planning Permission Timelines (UK Guide): Key Stages, Limits & Council Rules
Planning permission in the UK typically takes around 8 weeks, but delays are common. This guide explains each stage of the timeline, council quirks, and what to do if your application runs late. Clear tips, FAQs, and local insights help you plan with confidence.
Kitchen Extensions: Costs, Planning Rules & Local Council Quirks (UK Guide)
Thinking about a kitchen extension? Our UK guide explains planning rules, council quirks, costs, timelines, and how much value you could add. Discover when Permitted Development applies, what approvals you’ll need, and how to make sure your extension is both compliant and worth the investment.
Loft Conversions (UK) — Costs, PD Rules, Process & Council Quirks
A clear UK homeowner’s guide to loft conversions — covering costs, timelines, types, planning permission vs Permitted Development, Building Regulations, and council quirks. Discover how much value a loft adds, what pitfalls to avoid, and the exact process step-by-step. Perfect if you’re considering a roof-light, dormer, hip-to-gable, or L-shaped conversion.
Building Control Inspections – What to Expect
Building Control inspections are essential checks during construction to make sure your project is safe, compliant and approved for resale. From foundations and drainage to insulation and final sign-off, inspectors ensure standards are met. Learn what councils look for, local quirks to prepare for, and how to avoid costly delays with expert guidance.
