Wraparound and side-return extensions

An extension that wraps around the side and the rear usually falls outside permitted development, so it needs a householder planning application.

A side-return extension on its own can sometimes be permitted development, within limits on width and height.

What’s been approved nearby matters most here. I look at similar extensions on your street and around it before I draw anything.

In a conservation area, or where an Article 4 direction removes some permitted development rights, more of this needs a planning application, and designs need more care.

The sample Scope is for a side or wraparound extension. It shows how I look at what’s been approved nearby.

An informed view of what’s likely, not a promise. The decision always rests with the council.

1. 01

   Party walls. On a terrace or semi, the Party Wall etc. Act 1996 may apply if work is on or near a shared wall or boundary, or digs close to a neighbour’s foundations. Notices must go to the neighbours in good time before work starts.

2. 02

   A structural engineer. Usually needed for steel beams, new openings in load-bearing walls and foundations. Their calculations go to building control. I bring the engineer in and manage their work for you.

3. 03

   Drains. Side returns often have drains running through them. If a public sewer is under the new floor, you’ll usually need the water company’s agreement to build over it.

4. 04

   Building Regulations. A separate approval from planning. It covers structure, fire safety, insulation, drainage and ventilation, and most extensions and structural alterations need it. I prepare the technical drawings.

Measured survey, design options, then planning drawings. I prepare and submit the application, and deal with the council. Then the technical drawings for Building Regulations, with the structural engineer and building control coordinated for you.