Quick summary: Building Regulations certificate of completion
A Building Regulations certificate of completion is an important document confirming that, so far as the building control body is satisfied, building work covered by its application complies with the relevant Building Regulations requirements. For homeowners, it is particularly useful when selling or remortgaging a property because it provides evidence that regulated work was properly completed.
- It is normally issued after completion once the required inspections, paperwork and final checks have been satisfactorily dealt with.
- You should notify Building Control when the work finishes so the completion process and any required final inspection can take place.
- Keep the certificate safely with your property records, drawings, structural calculations and other compliance documents.
- If your certificate is missing, contact the building control body that dealt with the original application before assuming you need retrospective approval.
- A completion certificate is not the same as planning permission, a warranty, an electrical certificate or a practical completion certificate from your builder.
The exact process can vary depending on the type and age of the work, who supervised Building Control and whether specialist compliance certificates are also required. This guide explains what homeowners in England need to know and what to do if the paperwork cannot be found.
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What is a Building Regulations certificate of completion?
A Building Regulations certificate of completion is issued at the end of qualifying building work when the relevant building control body is satisfied that the applicable requirements have been met.
In a typical home extension, loft conversion or structural alteration, Building Control will usually have been involved at various stages of the project. Inspections may take place as foundations, insulation, drainage, structural elements and other parts of the work are completed. Once the project reaches the end, the completion procedure provides the final piece of Building Control paperwork.
If you are still getting to grips with the overall system, start with our complete homeowner guide to the Building Regulations process. It explains when approval is required, how applications work and where completion fits into the wider process.
Do I need a Building Regulations completion certificate?
If your project required Building Control involvement, you should normally make sure the completion process is properly closed out rather than assuming that the last site visit automatically finishes the application.
This matters for practical reasons as well as compliance. A solicitor, buyer, lender or surveyor may ask for evidence relating to alterations when the property is sold or remortgaged.
Typical work where completion paperwork may matter
- house extensions;
- loft and garage conversions;
- structural alterations and removal of load-bearing walls;
- certain drainage alterations;
- new dwellings and substantial renovation work; and
- other work requiring a Building Regulations application.
However, not every home improvement follows the same route. Some types of work can be self-certified by installers registered with an authorised competent person scheme. In those cases, you may receive a separate compliance certificate rather than the same paperwork produced following a conventional Building Control application.
Our guide to the documents worth keeping after a home project explains the wider paperwork homeowners should retain.
How do I get a building completion certificate?
For ordinary domestic work in England, obtaining the certificate is generally the final stage of the Building Control process. The key is to make sure Building Control knows that the work has finished and has everything it needs to close the application.
Step-by-step: obtaining your completion paperwork
- Check who handled Building Control. Confirm whether the application was dealt with by the local authority or another building control body.
- Make sure the required inspections have taken place. Missing inspections can make completion more difficult because parts of the construction may already be covered.
- Notify Building Control that the work is complete. Under the current process, the relevant completion notice should be submitted promptly after the work has finished.
- Provide outstanding documents. This could include structural calculations, electrical information, energy-related documents or other evidence relevant to the project.
- Arrange or complete the final inspection. Building Control may need to inspect the finished project before closing the application.
- Resolve any outstanding items. If something does not comply or evidence is missing, deal with it before expecting the certificate to be issued.
- Store the certificate securely. Keep both a digital copy and the original paperwork with your property records.
If you are earlier in the project, our guides to preparing for Building Control site inspections and getting your project through the approval stage will help you understand what happens before completion.
Not sure whether your Building Control file is actually complete?
We can help you identify the drawings, calculations and compliance information that may be relevant before you contact Building Control.
How long does it take to get a Building Regulations completion certificate?
GOV.UK currently advises that you will usually receive a completion certificate within eight weeks of completion, provided the work complies. In practice, the time depends on whether the completion notice has been supplied, the final inspection is satisfactory and all outstanding information has been received.
Quick costs snapshot
There is no single nationwide price for obtaining a duplicate or dealing with an old incomplete Building Control file. Charges can vary between authorities and according to what work is required.
- Original completion process: normally forms part of the Building Control service you have already paid for.
- Replacement copies: some authorities make an administration charge.
- Old or incomplete work: additional inspection, investigation or professional costs may arise.
- Retrospective cases: separate fees can apply if a formal regularisation route is required.
What happens if there is no Building Regulations completion certificate?
A missing certificate does not automatically mean the work is unsafe or that no Building Control application ever existed. Sometimes the work was inspected but the application was never formally closed. In other cases, a certificate existed but the homeowner no longer has a copy.
Where do I find my Building Regulations certificate?
Start with the building control body that handled the original application. If the local authority dealt with it, ask its Building Control team whether the application record and certificate are still available.
Older records can be less straightforward. Councils have different archive arrangements, and the existence of an old application does not necessarily mean that a completion certificate was issued.
Can I get a copy of a Building Regulations certificate?
Often, yes, provided the original building control body still holds the record. There may be an administration charge for searching historic records or supplying copies.
What if the work was completed without Building Regulations approval?
That is a different situation. Depending on the circumstances, a retrospective Building Regulations route may be available. Building Control may need evidence of how the work was constructed, and concealed parts could need further investigation.
Read our guides to dealing with work completed without the normal approval process and the regularisation route for historic unauthorised work before deciding what action is appropriate.
Building Control certificate of completion vs other property certificates
Several documents have similar-sounding names, which is why homeowners can easily end up looking for the wrong certificate.
Completion certificate vs planning permission
Planning and Building Regulations are separate systems. Planning permission deals principally with whether development is acceptable from a planning perspective, while Building Regulations deal with standards such as structural safety, fire safety, energy efficiency, ventilation and drainage.
Completion certificate vs practical completion
A builder or contract administrator may refer to practical completion. That is a construction-contract concept and is not the same as Building Control confirming compliance.
Completion certificate vs electrical or installer certificate
Electrical work, replacement windows, heating installations and other specialist work may have their own certification arrangements. Those documents should not automatically be treated as substitutes for the paperwork relating to the wider Building Control application.
For a broader explanation of the different types of evidence you may encounter, see our guide to Building Regulations certificates and when each may apply.
Local council procedures and older completion records
Although Building Regulations operate under a national framework in England, administrative procedures can differ between building control bodies. For example, councils may have different methods for requesting archive searches, replacement documents or final inspections on older applications.
Therefore, if you are buying or selling a house with historic alterations, it is sensible to identify who handled the original Building Control application before making assumptions about what paperwork should exist.
FAQs: Building Regulations certificate of completion
What is a Building Regulations certificate of completion?
It is the document issued at the end of relevant Building Control work when the building control body is satisfied that the applicable Building Regulations requirements have been met. Keep it with the permanent records for your property.
How do I get a Building Regulations completion certificate?
Make sure Building Control has been notified that the work is finished, complete any required final inspection and provide outstanding compliance information. If the work is satisfactory, the building control body can then issue the certificate.
How long does it take to get a Building Regulations certificate?
GOV.UK says you will usually receive a completion certificate within eight weeks of completion where the work complies. Missing paperwork, unfinished items or an outstanding final inspection can delay the process.
Do I need a Building Regulation completion certificate?
Where work has been through the Building Control process, you should make sure the application is properly completed and retain the resulting paperwork. It can be important evidence when you later sell, remortgage or investigate previous alterations to the property.
What happens if I have no completion certificate?
First establish whether a Building Control application existed. The certificate may simply be missing, or the original application may still be open. If the work was carried out without the required approval, a different retrospective route may need to be considered.
Where can I get a copy of my Building Regulations certificate?
Contact the building control body that handled the original application. If your council dealt with the work, its Building Control team may be able to search its records and provide a copy, although archive availability and charges vary.
Can I get a completion certificate after the work has already finished?
Possibly, but the correct route depends on what happened originally. If there was a valid application and inspections took place, Building Control may be able to explain what is still needed to close the file. Work carried out without approval may require a retrospective procedure instead.
When were Building Regulations completion certificates introduced?
There is not a useful single date that applies to every historic property record. Completion certificate provisions were included in the Building Regulations 1991, while the system has subsequently been replaced and amended, including through the Building Regulations 2010. Consequently, whether a particular older project should have a certificate depends on the rules and administrative arrangements applying at the time.
Is a Building Control completion certificate a warranty?
No. It records Building Control's position regarding compliance with the applicable requirements. It is not an insurance policy, structural guarantee or warranty against future defects.
Have an old extension or conversion with incomplete paperwork?
We can help you work out which drawings and compliance documents may be relevant before you approach Building Control.
Next steps & useful guides
If you are checking an existing project or preparing for Building Control on new work, these PME guides are the most useful next steps:
- Understand the complete approval journey from design to sign-off
- See what the Building Control team does during your project
- Prepare for the inspections carried out while work is on site
- Check which project records are worth retaining permanently
- Understand your options where previous work lacks the expected approval trail
- Read how the formal regularisation route works
- What it shows That the building control body is satisfied with the work in relation to the applicable Building Regulations requirements.
- When it is issued After the work is completed and the required completion procedure, inspections and outstanding information have been satisfactorily dealt with.
- Typical timing GOV.UK says a certificate will usually be received within eight weeks of completion where the work complies.
- If yours is missing Contact the building control body that dealt with the original application and establish whether a certificate was issued or the file remains incomplete.
- When selling Your solicitor, buyer, lender or surveyor may ask for evidence relating to regulated alterations carried out at the property.
- Not the same as Planning permission, practical completion, a builder's warranty or specialist installer certification.
Missing paperwork? Ask Plans Made Easy to help you identify what information may be needed.
Official Building Control guidance
Rules and procedures can change, so for current information we recommend checking the relevant official sources:
- GOV.UK guidance on applying for Building Control approval and completion
- Planning Portal guidance on the Building Control system
- Legislation.gov.uk – current statutory provisions covering completion
- Building Safety Regulator information and official guidance
Making sure your Building Control paperwork is properly finished
Reaching the end of the building work is not quite the same as finishing the Building Control process. Before you put the project file away, confirm that the final notification has been made, outstanding documents have been provided and any required final inspection has taken place.
Once issued, keep the completion paperwork with the rest of your property records. If it is missing years later, start by tracing the original application rather than assuming the worst. In many cases, establishing who handled the work and what remains on file is the most useful first step.
Plans Made Easy helps homeowners prepare clear drawings and Building Regulations information, coordinate the approval process and understand what documentation is needed from design through to completion.
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