How much does a structural engineer cost?

There is no useful single answer, because the fee follows the work. Here is what actually drives it, what a real project involves, and how we quote.

How our fees work

Fixed fees, agreed up front.

What a project costs depends on how many structural elements need designing, whether the existing structure has to be surveyed, and what the ground is doing. Tell us what you are building and we will give you a single fixed figure before you commit to anything.

Fixed, not hourly

We quote a single fixed fee for the whole piece of work. You are not paying for our time, so a difficult afternoon is our problem rather than your invoice.

Agreed in writing first

Nothing starts until you have the fee and the scope in writing and have said yes. No work is done on the assumption you will approve it.

No surprises later

If something on site turns out differently and the scope genuinely has to change, we tell you what it means before we do it, not afterwards.

The structural engineer is normally under one per cent of a project budget, and it is the part that decides whether the rest of the work gets signed off.

What drives the fee

Five things that change the number.

How many elements need designing

A single beam over one opening is one calculation. A rear extension with a new opening, altered roof and revised foundations is four or five, and the fee follows the work rather than the floor area.

Whether the existing structure has to be surveyed

Where usable drawings exist and the structure is known, we can work from them. Where the building is older or has been altered, somebody has to establish what is actually carrying load before anything can be designed.

What the ground is doing

Foundations are the most variable part of any domestic project. Clay, made ground, nearby trees and a sloping site all change the solution, and none of them are visible from a drawing.

Whether it is a repeat detail or a one-off

A standard opening in a standard wall is routine. A long span, a cantilever, a transfer structure or anything carrying a wall above takes longer and carries more risk.

Who else needs to be dealt with

Building Control, an approved inspector, a warranty provider, a party wall surveyor or a funder each add coordination. That is part of the job and it is part of the fee.

Real project examples

What a real job actually involves.

Three projects from our own records, showing the structural work each one needed. This is what a fee is actually buying.

102 Haggs Road, Glasgow

A domestic alteration where the load path had to be rebuilt from foundation to roof.

Goal post steel frame over a wide opening

Picture frame steel where lateral restraint was removed

Timber lintel and roof rafter design

Timber stud wall design

Wind loading assessment

Revised foundation plan under the new column positions

Quoted as a single fixed fee before work started.

Boturich Drive

Ground floor structural alteration combined with attic conversion and roof profile changes.

Existing and proposed ground floor plans

Proposed attic, roof plan and roof profiles

Existing and proposed sections

General specification and structural notes

Quoted as a single fixed fee before work started.

Cairngorm Road

A timber frame project where lateral stability was designed in both directions rather than assumed.

Wind loading assessment

Roof loads at 0 and 90 degrees

Racking resistance in both directions

Timber frame racking panel design

Proposed ground floor structural plan

Quoted as a single fixed fee before work started.

See the full case studies →

Questions

Common questions

How much does a structural engineer cost in the UK?

It depends on how many structural elements need designing, whether the existing structure has to be surveyed, and what the ground is doing. Rather than publish a figure that would be wrong for most projects, we quote a single fixed fee once we know what the job involves. Send drawings or describe the work and you will have a number before you commit to anything.

Why do structural engineer fees vary so much?

Because the work varies. One beam over one opening is a different job from an extension with altered roof structure and revised foundations. Fees quoted per square metre or as a percentage tend to overcharge simple projects and undercharge difficult ones.

Do you charge by the hour?

No. We agree a single fixed fee in writing before starting, so a difficult afternoon is our problem rather than your invoice.

What if the scope changes once work starts?

If something on site turns out differently and the scope genuinely has to change, we tell you what it means and what it costs before doing it, not afterwards.

How do I get a quote?

Send whatever you have. An architect's drawing is ideal, a dimensioned sketch works, and photographs of the wall with the rooms above and below are genuinely useful. If you have none of that, describe the project and we will tell you what is needed.

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