Work done without consent, and how it gets resolved

This looks at missing consents from the practical end — what holds up once conditions stop being ideal.

Two different permissions

Planning permission concerns whether a development may happen at all, given its effect on the area. Building control approval concerns whether the construction meets technical standards for structure, fire safety, insulation and drainage. Work can have one and not the other, and each is enforced by different mechanisms with different time limits.

A buyer needs to know which is missing, because the consequences and the remedies differ.

Why it matters to a buyer

A missing building control sign-off means nobody independently confirmed the work is structurally and thermally sound. That is a safety and cost question as well as a paperwork one, and a surveyor is the right person to look at the work itself. A missing planning consent can, within enforcement periods, lead to action requiring removal, which is a far larger risk.

Put simply, lenders and future buyers will raise the same points, so an unresolved issue reduces your buyer pool later.

Time limits and what they do

Many jurisdictions limit how long enforcement action can be taken for unauthorised development, with different periods for different breaches. Once the period has passed, the work may become immune from enforcement without ever becoming authorised.

Some systems provide a certificate confirming lawfulness through the passage of time, which is a genuine document rather than a workaround. Periods and procedures vary substantially, so this needs checking locally rather than assuming.

The routes to resolution

Retrospective application for planning permission is possible in many systems and carries the risk of refusal. Regularisation through building control involves inspection of the completed work, sometimes requiring opening up, and produces a certificate. Indemnity insurance covers the financial risk without curing anything and is the fastest option.

Which is appropriate depends on the nature of the work, its age, and whether you intend to build on it later.

Common examples

Loft conversions, removed internal walls, replaced windows, new heating systems, electrical rewiring and garage conversions all typically required some form of certification. Requirements changed over time, so work from an earlier decade may legitimately have needed nothing.

In practice, ask when the work was done and what the requirement was at that date rather than applying today rules retrospectively. Sellers who commissioned the work themselves usually know; sellers who inherited it often do not.

Adjust the size of it until it is something you would actually do tired.

Selling with a gap

Discover it before marketing, because resolving it takes longer than a buyer will wait. Disclose it accurately on the seller form, since knowingly inaccurate answers create liability after completion. Do not contact the local authority before taking advice, since that can remove the indemnity option.

For most people, this is general information; a conveyancer must advise on any specific consent issue.

The takeaway

Find out which permission is missing, how old the work is, and which of the three routes fits before anyone panics.

The version you keep doing is the version that works.