In short
Legalising unauthorised works is an engineering process before it is a paperwork one. What exists is inspected and documented, assessed for structural soundness and compliance, drawn as built with the technical reports the authority needs, and submitted and followed up with the municipality. The authority decides; the engineering tells you in advance what the works need.
Key points
- Start with an accurate survey of what was built; memory and old sketches are not enough.
- The engineering assessment answers two questions: is it safe, and what does it need to comply?
- As-built drawings and technical reports form the core of the application.
- Some works may need modification or strengthening before they can be accepted.
- The municipality decides; coordination keeps the process moving.
Many villas have a room, an annex, a covered terrace or a modification that was built without an approval. It may have been added years ago, by a previous owner, or in a hurry. Regularising it is possible in many cases, and the route starts with engineering.
1. Site inspection and documentation
What exists is measured and recorded: dimensions, structure, materials, connections to the original building, services, and the condition of everything. Photographs and measurements replace memory.
2. Engineering assessment
The assessment answers two questions. Is the work structurally sound, and is it safe to keep? And what does it need in order to comply? The answer may be that it can be accepted as it is, that it needs modification or strengthening, or that part of it cannot stay.
3. Drawings and technical reports
The application is built on as-built drawings of what exists and the technical reports that support them. Our guide to as-built drawings explains what they contain and why accuracy matters.
4. Coordination with the municipality
The submission is made and followed up with the municipality, answering comments and providing what is requested until the case is closed. Rules and procedures are set by the authority and can change, so the current requirements are confirmed for each case.
Experience at scale
With ADYARD (ALTRAD Group) we delivered structural engineering consultancy for a major project focused on the legalisation and technical compliance of non-conforming buildings, aligning them with regulatory requirements and structural safety standards.
Before you build the next one
The cheapest legalisation is the one you never need: see before you build an annex. If you have works to regularise, send us the details.
Questions
Will my extension definitely be approved?
No consultant can promise that; the decision belongs to the authority. The assessment tells you what the works need in order to comply, so you can decide before you apply.
Do I need to legalise before selling?
Unregistered additions can complicate a sale, a permit or a utility connection. It is better to understand the position early; ask the authority or your consultant for your specific case.