House Extensions

A house extension can transform your home, providing the additional space your family needs without the cost and disruption of moving. Whether you are planning a single storey rear extension, a wrap-around extension or a double storey addition, Offset Engineering provides the complete structural engineering package to support your project from design through to building control sign-off.

Structural Engineering for Single Storey Extensions

A single storey extension requires careful structural design, including foundation design appropriate to the ground conditions and location, structural frame design (typically masonry, steel or timber), roof structure design, and the design of any new openings connecting the extension to the existing property. Our engineers assess all these elements and produce comprehensive calculations for building control submission.

Structural Engineering for Double Storey Extensions

A double storey extension involves greater structural complexity, with higher loads on the foundations and structural frame. Our engineers carry out a full structural assessment of the proposed extension, designing the foundations, walls, floor structures and roof to carry the required loads safely. We also assess the impact of the new extension on the existing structure and design any required modifications.

Foundation Design

Foundation design is a critical element of any extension project. The foundation type and depth depend on the ground conditions, proximity to trees, existing services and the loads involved. We work with the ground conditions and any ground investigation data available to specify appropriate foundations, whether strip foundations, pad foundations, raft foundations or piled solutions for more challenging ground conditions.