Structural engineering for two-storey extensions in East Riding of Yorkshire

East Riding of Yorkshire at a glance

Nation: England
Price region: Yorkshire and the Humber
Postcode areas: DN, HU, YO
Towns covered: 8 listed below, plus surrounding villages
Site visits: Free, no obligation

What a structural design involves

Structural engineering for a two-storey extension involves calculating how the new floors, walls and roof carry their loads down to the ground, and designing the beams, lintels, foundations and ties into the existing house to suit. The engineer's calculations and drawings form part of the building regulations approval. They also tell the build team exactly what steel and foundations to install.

Towns in East Riding of Yorkshire include Hull (HU1), Bridlington (YO15), Beverley (HU17), Goole (DN14), Brough (HU14) and Driffield (YO25). If yours isn't listed, we still cover it.

Fees

A structural engineer (calculations and beam design) is a guide of £750–£2,200, priced in writing once the design is known.

Rules in England

In England, structural engineering is part of building regulations approval under Part A rather than planning. The engineer's calculations go to council building control or a registered building control approver with the full plans application. Where more than one contractor is involved, the Building Safety Act dutyholder rules also apply.

Approval in England: Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.

Building regulations: Building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end.

The Party Wall etc. Act 1996 applies, so notices may be needed for work on or near a shared wall or boundary.

Getting the design right

Foundations for two storeys

Two storeys put more load on the ground than one, so foundations are usually deeper or wider. Clay soil, nearby trees, drains and made-up ground can all mean deeper trench fill or piles, which is why we dig trial holes before fixing the design.

Beams and padstones

Steel beams carry the first floor and roof over openings, and they sit on padstones that spread the load into the walls. The engineer sizes each beam and checks the walls can take the point loads, which affects ceiling heights and where posts can go.

How we work in East Riding of Yorkshire

Measure and listen
A visit to East Riding of Yorkshire to understand how you live in the house now and what the extra rooms need to do, plus a first look at the structure.
Choose the approval route
Some designs fit permitted development, most need a householder application. We decide which applies in England before drawing in detail.
Fixed price in writing
With approved drawings and calculations, we give you a fixed build price and a programme you can plan around.
Build and hand over
We manage the build from groundworks to decoration-ready finish and hand over with the completion paperwork.

Towns we cover in East Riding of Yorkshire

Structural engineering for two-storey extensions in East Riding of Yorkshire: questions

Do I need a structural engineer for a two-storey extension?

Almost always. Building control needs calculations showing that the foundations, beams and walls can carry the loads of two storeys and a roof. A two-storey extension usually involves removing part of an outside wall and new steel, which needs an engineer's design.

How deep do foundations need to be for a two-storey extension?

There is no single depth. It depends on the soil, nearby trees, drains and the loads. On firm ground foundations may be around a metre deep, while clay near trees can need much deeper trench fill or piles. Trial holes and the engineer's design set the depth, and building control inspects the trenches.

Can a steel beam be hidden in the ceiling?

Often, yes. A beam can sit within the floor depth so the ceiling is flat, but that may mean a deeper steel section or a different floor structure. Otherwise it shows as a downstand below the ceiling. We discuss the options with you and the engineer before the design is fixed.

Neighbouring areas

All extension services in East Riding of Yorkshire · About structural engineering for two-storey extensions