How much does a structural engineer cost in London in 2026?

Structural engineer fees in London typically range from £400 for a single steel beam calculation up to £3,000 for a full structural package with drawings. Most residential jobs (loft conversions, extensions, chimney removal, surveys) fall between £400 and £1,500. At SBS we quote a fixed fee — the price you are quoted is the price you pay.

How much does a structural engineer charge per hour?

At SBS we do not charge hourly rates for residential projects. We quote a fixed fee for the whole job. Engineers who do work on an hourly basis in London typically charge £80 to £150 per hour, but for homeowners a fixed fee is almost always cheaper and more predictable.

Is a structural engineer cheaper outside London?

Slightly. Engineers based outside the M25 sometimes charge 10–20% less, but they may not understand London-specific Building Control requirements, party wall conventions, or typical period property construction. The savings often disappear when revisions are needed. Local engineers covering Ilford, Tilbury and Thurrock combine London experience with competitive Essex pricing.

Do I need calculations or drawings?

Simple jobs like a single steel beam in a wall removal often only need calculations and a basic detail. Loft conversions, extensions, and anything with multiple structural elements need full structural drawings as well. Building Control will tell you which they require, but a structural engineer can advise upfront.

What is a typical structural engineer fee for a loft conversion?

For a standard loft conversion in London (dormer or hip-to-gable), full structural calculations and drawings cost £800 to £1,500 in 2026. More complex jobs with multiple steel beams, mansards, or party wall implications can be £1,500 to £2,500.

Are the fees fixed or estimated?

At SBS every quote is a fixed fee. We don't add hourly extras, scope-creep charges, or surprise revision fees. If Building Control asks for changes to the calculations after submission, we handle it within the original quote.

Do you cover Ilford, Tilbury and Thurrock?

Yes. We are based in Ilford and regularly work across Ilford, Redbridge, Newham, Tilbury, Grays, Thurrock, and the wider East London / South Essex area. Travel within roughly 25 miles of Ilford is included in the fixed fee.

Structural Engineer Cost London 2026 | Fees from £400 (Fixed Price)

How Much Does a Structural Engineer Cost in London? (2026 Prices)

If you are planning a home project — a loft conversion, rear extension, chimney removal, or knocking through a load-bearing wall — one of the first questions is: how much will a structural engineer cost?

Short answer: for most residential jobs in London and Essex in 2026, expect £400 to £1,500 for the structural engineering package. Single steel beams start at £400. Full loft conversion or extension calculations are £800 to £1,500. Larger packages with drawings run £1,200 to £3,000. All quotes at SBS are fixed-fee — no hourly rates, no surprises.

Typical Structural Engineer Fees in London

Service	Typical Cost Range
Loft conversion calculations	£800 – £1,500
Rear/side extension calculations	£800 – £1,800
Steel beam calculation (single beam)	£400 – £800
Load-bearing wall removal	£400 – £900
Chimney breast removal	£400 – £800
Structural survey	£400 – £800
Full structural package (drawings + calcs)	£1,200 – £3,000
Retrospective Building Regs application	£600 – £1,200

These are guide prices. The actual cost depends on the complexity of your project, the size of your property, and whether you need drawings as well as calculations.

Real Project Examples from SBS

To give you a clearer picture, here's what actual recent projects cost our clients:

Victorian terrace in Ilford — rear extension + wall removal: A homeowner wanted a 4m rear extension with the kitchen wall knocked through to create open-plan living. We provided full structural calculations, steel beam design for the wall removal, foundation details, and Building Control drawings. Total fee: £1,400. Building Control approved first time, builder started 6 days after we were instructed.

1930s semi in East Ham — loft conversion: Full dormer loft conversion including new floor joists, ridge beam, staircase opening trimmer, and two dormer support steels. This was a more complex job because the existing party wall needed checking against the increased loading. Total fee: £1,200. Turnaround was 5 working days.

Edwardian mid-terrace in Stratford — chimney breast removal: Ground floor chimney breast removal with gallows brackets to support the breast on the first floor. Straightforward job once we'd confirmed the stack condition. Total fee: £450. Done in 3 working days.

The common thread: every project was fixed-price, quoted upfront, with no surprises.

What's Included in Structural Engineer Fees?

When you hire a structural engineer, you're paying for:

Site visit — we inspect your property and take measurements
Structural calculations — the engineering analysis that proves the design is safe
Structural drawings — detailed plans your builder works from
Building Control submission — we prepare everything Building Control needs to approve the work
Revisions — if Building Control has queries, we handle them

At SBS, our quotes are fixed. The price we quote is the price you pay. No hourly rates, no surprises.

What Affects the Cost?

Project Complexity

A simple steel beam for a knocked-through wall costs less than a full loft conversion with dormers, new staircases, and multiple structural elements.

Location

London structural engineers tend to charge more than those outside the M25 — but you also get local knowledge of London borough Building Control requirements, party wall considerations, and typical property types.

Turnaround Time

Standard turnaround is around 5–7 working days at SBS. If you need drawings urgently, our express 48-hour service is available for an additional fee.

Drawings vs Calculations Only

Some projects only need calculations (e.g. a single steel beam). Others need full structural drawings. Drawings cost more but give your builder everything they need.

How SBS Keeps Costs Down

We specialise in residential structural engineering — that's all we do. This focus means:

We work efficiently because we design loft conversions, extensions and steel beams every day
We don't charge for a lengthy "scoping phase" — we know what's needed
Fixed pricing means no clock-watching and no bill shock
1-week turnaround keeps your project on track and avoids costly delays

When Do You Need a Structural Engineer?

You'll need a structural engineer for any work that affects the structure of your home:

Loft conversions — steel beams, floor strengthening, staircase openings
Extensions — foundations, steelwork, connections to existing structure
Removing a wall — if it's load-bearing, you need a steel beam designed
Chimney breast removal — gallows brackets or steel beams to support the stack above
Subsidence or cracks — a structural survey identifies the cause and solution
Buying a property — a structural survey tells you what you're really buying

Do I Need a Structural Engineer or an Architect?

Both do different things:

An architect designs the layout and appearance of your project
A structural engineer designs the hidden structure that holds everything up — beams, foundations, load paths

For many residential projects, you need both. Some homeowners start with an architect's drawings and then come to us for the structural design. Others come to us first if they already know what they want (e.g. "I want to remove this wall").

Related Guides & Local Pages

If you want a deeper breakdown of a specific job:

Looking for a structural engineer in your area? Start with our local pages:

Chimney breast removal in Ilford · Thurrock
Structural surveys in Ilford · Thurrock
Steel beam calculations in Ilford · Tilbury
Loft conversions in Ilford · Thurrock

Get a Free Quote

At SBS Structural and Architectural Design, we offer free consultations for homeowners across London, Essex and Kent. We'll discuss your project, explain what's needed, and give you a clear fixed price.

Phone: +44 7401 650 600
Email: sbs.structures@gmail.com
Office: 61 Cranbrook Road, Ilford, IG1 4PG

We cover over 70 locations including Ilford, East London, Stratford, Romford, Barking, Greenwich, and beyond.