Structural alterations in South Glamorgan

Covering South Glamorgan

Our structural alterations service in South Glamorgan covers Cardiff, Barry, Penarth and Llantwit Major and more.

Homes in South Glamorgan

Welsh homes include long terraces built into hillsides, stone cottages and modern estates, and sloping sites often shape how and where an extension can go.

What does a structural alteration involve?

Structural alterations change the load-bearing parts of a house, most often removing a wall between two rooms and putting in a steel beam to create an open-plan layout. The work needs a structural engineer’s design and building regulations approval.

Steel beam installation on padstones
Fire protection and plaster encasement
Making good floors, walls and ceilings

How much should I budget for a structural alteration?

Use these ranges to budget for structural alterations; the survey turns them into a fixed price for the agreed specification.

Structural alterations	Guide price incl. VAT
Single load-bearing wall removal with steel	£3,000 to £7,500
Chimney breast removal with support	£1,800 to £4,500
Multiple walls or full open-plan remodel	£8,000 to £20,000

Do you need permission for a structural alteration in South Glamorgan?

Welsh projects need planning clearance from the council under Welsh rules, building regulations approval under the Welsh approved documents, and party wall notices where the work affects a neighbour’s wall or foundations.

Internal work like this does not usually need planning permission in Wales unless the building is listed. Building regulations approval is needed for the structural work.

What can change the price or programme?

Removing walls can affect the fire escape route on open-plan ground floors in three-storey houses.
Pipes and cables in the wall need rerouting first.

How does the project run?

Tell us about the project. Call, use the guide price tool or send the form with a few photos and a postcode.
Survey at your house. We look at the existing structure, services and access, and agree what the design needs to achieve.
Design and fixed price. You get drawings and a written price for the agreed specification before anything is ordered.
Build and hand over. Our teams build to the programme, building control inspects, and you get the completion paperwork at the end.

What people ask before starting

How much does it cost to remove a load-bearing wall?

Usually £3,000 to £7,500 including VAT for a single wall with a steel beam, calculations and making good.

Can the steel be hidden in the ceiling?

Often it can be set within the floor depth, avoiding a downstand. The engineer confirms what is possible.

Do you work in South Glamorgan?

Yes. South Glamorgan is within our coverage for structural alterations, along with nearby Cardiff and Barry.

Other towns nearby

Learn more about structural alterations, or see every project we cover in South Glamorgan.