Missing building control completion certificate in Derry?

Identify the document before trying to replace it

A missing completion certificate is not the same as proof that no application was made. Equally, an approved drawing or a paid builder's invoice does not establish that the work received its final building-control certificate. Start by finding out what the records actually show for the particular alteration.

For a Derry house sale, tell your solicitor what is missing and share the documents you do have. Agree the next enquiries before making applications, buying insurance or commissioning remedial work. This guide cannot determine whether a particular project required approval or which solution is appropriate for your sale.

Separate application, approval, inspection and completion

The council's published process separates the application and review stages from site inspections and completion. It says a completion certificate follows the relevant information and final inspection, where compliance has been demonstrated. A file reference is useful for tracing the application, but is not itself a certificate.

Planning paperwork should be kept in a separate part of the folder. A planning decision and building-control records answer different questions. Ask which documents relate to the actual work, including any changes made during construction. Avoid describing an extension as fully signed off because you have found one official-looking letter.

Build a work history the council can recognise

Make one entry for each project: what changed, where in the house, approximate start and finish dates, who arranged it and the application reference if known. Use the property address shown on the old paperwork as well as the current address if they differ. Keep estimates of dates clearly labelled.

Collect drawings, correspondence, inspection notes, completion documents and supporting certificates that you actually hold. Add the architect or builder's contact details for your solicitor if available. A photograph can help identify a project, but it does not establish compliance or replace an inspection record.

For example, treat a rear extension and a later garage conversion as separate enquiries, even if both appear on the current floor plan. Ask whether a certificate covers the whole recorded project or just one part. That is more useful than asking for a certificate for the house without identifying the work.

Use the answer to choose the next enquiry

If the certificate was issued but your copy is missing, ask about obtaining the relevant record. If the application exists but was not completed, ask what information or inspection remains outstanding. Derry City and Strabane District Council says its building-control team can check application status using the address and file reference.

Where work was carried out without an application, the council describes a regularisation process. It is not an automatic certificate: compliance has to be demonstrated, and work may need attention. Have your solicitor and the council explain the appropriate route and obtain professional advice on any physical work required.

The council describes regularisation for unauthorised work commenced on or after October 1973. For earlier work or an uncertain construction date, ask what evidence and process are appropriate instead of assuming the same route applies.

Do not infer that an old alteration is acceptable simply because it has been used for years. Equally, do not promise a buyer that removing or rebuilding it is inevitable. Record the actual response, who gave it and what further evidence is requested before making that leap.

Explain the uncertainty without inventing a discount

Keep the agent updated with a factual summary agreed with your solicitor: which project is being checked, which records exist and what remains unresolved. Ask how that affects the proposed marketing and sale timetable. Do not hide the issue behind a room description or present an application in progress as an approval.

There is no reliable flat percentage to subtract from a Derry asking price for missing paperwork. The answer depends on what is actually missing and what is needed to resolve it. An online estimate cannot inspect the alteration or clear it for a lender, so keep the guide price and the documentation issue separate.

For the separate pricing question, see how to assess an extension's contribution to house value.

Read what the online estimate can and cannot establish before using it in your sale planning.