When in the project does this happen?

Normally at the technical stage, after the scheme is settled, so the calculations reflect what will actually be built.

Is it included in the design fee?

Structural calculations are included in the Planning & Technical Design and Planning to Tender packages. Your written quote confirms the project scope and any work that is not included.

Does my builder need it before pricing?

It helps. Structural elements are a significant part of the cost, and pricing without them is less reliable.

Structural engineering for home projects

Most extensions involve removing or supporting structure. Structural design produces the calculations and details that building control and your builder need, coordinated with the technical drawings for the agreed project.

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Free to start. No obligation. No drawings needed.

When structural design is needed

Removing or opening up a load-bearing wall
Forming new openings for doors, windows or bi-folds
Loft conversions, where new floor and roof structure is introduced
Two-storey extensions and anything affecting foundations

What you receive

Typically structural calculations and structural drawings or details showing beams, lintels, connections and foundations, issued for building control and for the builder to work from.

Who this is for

Homeowners whose extension or conversion affects structure
People whose building control body has asked for calculations
Anyone who would rather have the structural work coordinated alongside the design

Typical process

The need for structural design is identified during the technical stage.
The agreed package scope is confirmed in writing before the work begins.
Calculations and details are produced and coordinated with the drawings.
The information is issued for building control and construction.

Important things to be aware of

Structural calculations are included in the Planning & Technical Design and Planning to Tender packages. Additional investigation or specialist work outside the agreed scope is quoted separately.
Site conditions sometimes differ from assumptions and can require revised design during construction.
Where existing structure cannot be inspected without opening up, assumptions have to be confirmed on site.

Frequently asked questions

When in the project does this happen?: Normally at the technical stage, after the scheme is settled, so the calculations reflect what will actually be built.
Is it included in the design fee?: Structural calculations are included in the Planning & Technical Design and Planning to Tender packages. Your written quote confirms the project scope and any work that is not included.
Does my builder need it before pricing?: It helps. Structural elements are a significant part of the cost, and pricing without them is less reliable.

Official sources

GOV.UK - Approved Documents for the Building Regulations

Tell us about your project

Tell us about your property and what you would like to change. We review the enquiry and you can request a free 15–20 minute call to talk it through. We help homeowners in Hampshire, Surrey and Berkshire.