West Sussex · RH12, RH13
Structural Alterations in Horsham
A structural alteration, or knock-through, removes or alters a load-bearing wall — typically to join a kitchen and dining room — and requires structural calculations from an engineer, a supporting steel beam sized to the load, and Building Regulations approval before and after the work.
In Horsham, that covers Roffey, Holbrook, Littlehaven, Denne, Trafalgar, Broadbridge Heath, Southwater, Warnham, Colgate. Horsham's town centre retains a historic core of timber-framed and Georgian buildings around the Carfax and Causeway, surrounded by Victorian villas, interwar suburbs and newer developments on the town's edges. The surrounding villages and countryside sit close to the South Downs, which shapes both the property styles and the planning context for extension and renovation work.
Coverage
Areas we cover in Horsham for structural alterations
Property styles in Horsham
Horsham has a strong stock of period cottages and Victorian villas in and around the town centre, alongside 20th-century family housing in the surrounding estates and larger detached homes in the outlying villages. Extension and loft conversion potential varies significantly between the historic core and the more recent suburbs.
Planning considerations
Horsham District Council is the local planning authority. The town centre, including the Causeway, is a conservation area with a number of listed buildings, meaning alterations to visible elevations, windows and materials are more tightly controlled. Some outlying villages also have their own conservation area designations, which we check before advising on likely planning routes.
How it works
Our structural alterations process
- 01
Structural survey
Assessing the wall, what it supports, and the loads involved, ahead of instructing an engineer.
- 02
Engineer's calculations
A structural engineer sizes the steel or other structural solution and produces calculations for Building Control.
- 03
Building Regulations and party wall
Submitting a Building Regulations application and serving party wall notice if the work affects a shared wall.
- 04
Construction
Temporary propping, forming the opening, installing the steel and making good, with a Building Control inspection before the work is covered up.
Also in this area
Other services we provide in Horsham
Nearby coverage
Structural Alterations in nearby areas
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FAQs
Structural Alterations in Horsham: FAQs
Do you provide structural alterations across all of Horsham?
Yes, we cover the RH12 and RH13 postcode areas in full, including Roffey, Holbrook, Littlehaven, Denne, Trafalgar, Broadbridge Heath, Southwater, Warnham, Colgate.
Do I need planning permission to remove an internal wall?
Usually no — removing an internal load-bearing wall is normally a Building Regulations matter rather than a planning one, provided the property isn't listed and the work doesn't affect the external appearance. We confirm the position for your property at survey.
How do I know if a wall is load-bearing?
Load-bearing walls typically run perpendicular to floor or roof joists, sit above a wall or support on the floor below, or align with the roof structure — but this isn't reliable to judge by eye, so we assess it on-site and confirm with a structural engineer before any work starts.
Is Horsham town centre a conservation area?
Yes, the historic core around the Carfax and Causeway is a conservation area with a number of listed buildings, which affects what changes can be made without planning permission or listed building consent.
Get a quote for structural alterations in Horsham
Tell us about the property and what you have in mind, and we'll arrange a site visit.
Last reviewed 2026-07-28.