Bungalow and upward extensions in Cornwall

Covering Cornwall

Our bungalow and upward extensions service in Cornwall covers Redruth, Falmouth, St Austell and Truro and more.

Projects in Cornwall are taken on by arrangement, and any travel and accommodation costs for the team are shown openly in the quote.

Homes in the South West

Homes in the South West range from coastal and rural properties in stone and slate to city terraces and modern estates, so extensions are designed to match the local materials.

What goes into an upward extension?

The first question is whether the existing walls and foundations can carry the extra load, so we start with a structural survey. Then we design either a full first floor or a raised roof with dormers, handle planning or prior approval, and build the new storey while protecting the floor below.

Design and planning or prior approval application
New first-floor structure, walls and roof
Staircase and changes to the ground floor layout

How much should I budget for an upward extension?

Guide prices for bungalow and upward extensions, including VAT where it applies. Your fixed price is confirmed in writing after the survey.

Bungalow and upward extensions	Guide price incl. VAT
Chalet conversion with dormers (total)	£45,000 to £85,000
New first floor, standard specification	£2,200 to £2,800 per m²
New first floor, good specification	£2,800 to £3,300 per m²
New first floor, high specification	£3,300 to £3,800 per m²

What approvals does an upward extension need in England?

Projects in England go through two separate checks. Planning (or confirmation that the work is permitted development) comes from the district, borough or unitary council, and building regulations approval comes from the council’s building control team or a registered building control approver. Where work touches a shared wall or digs near a neighbour’s foundations, the Party Wall etc. Act 1996 applies.

In England, Class AA permitted development allows an extra storey on many detached and semi-detached houses built between July 1948 and October 2018, subject to a prior approval application covering design, neighbours’ amenity and other matters.

What should Cornwall homeowners check first?

Some bungalow foundations need strengthening before a storey can be added.
The staircase takes space from the ground floor plan.

From first call to completion

Start with a conversation. A short call or the online form is enough for us to understand what you want to build.
Free site visit. We measure up, look at access, drains and the structure, and talk through options and budget.
Drawings, approvals, written quote. We prepare the design, apply for the approvals it needs, and give you a fixed price in writing.
Construction and completion. One site lead co-ordinates every trade through to the building control certificate.

Your questions answered

How much does it cost to add a storey?

Around £2,200 to £3,800 per square metre of new floor including VAT, or £45,000 to £85,000 for a chalet conversion with dormers.

How long does it take?

About 12 to 24 weeks on site.

Can you visit a house in Cornwall to quote?

Yes. After a short call we arrange a site visit to measure up and agree what the design needs to do, then send a written price.

Bungalow and upward extensions near Cornwall

Learn more about bungalow and upward extensions, or see every project we cover in Cornwall.