Plan a Double-Height Extension

Building a double-height extension costs less per metre squared than a single storey addition

Plan-a-Double-Height-Extension

If you need extra space on the first floor as well as the ground, a two-storey extension might be the answer. The lower walls need to be strong enough to support the upper floor, but it doesn’t mean that it will cost twice as much. Double the figure for a single floor and then deduct 20 per cent to get a rough idea of the cost. Again, it’s likely you’ll need planning permission and changes must comply with building regulations.

Case Study

If you’re having trouble with planning permission, don’t despair. A double-height extension within permitted development might be the answer, as these London homeowners found. When Lambeth planning turned down their client’s plans, Charles Barclay Architects realised that by redesigning they could avoid needing planning permission. Under permitted development, a new extension can exceed 4m in height if it is not within 2m of the boundary. So CBA altered the orientation so that instead of running across the back of the house, it would be at a right angle to the property, away from any of the boundaries. The red cedar-clad, two-storey ‘box’ makes a striking addition to their home.

 

 

Words: Justine Roffey and Trish Lorenz

 


Useful Tools

firsttime tradefinder mortgagecalc

Latest Press Releases

Latest Products, Services and Tradesmen from our Trade Finder

Build Archive

a-buyer-s-guide-to-windows

A buyer's guide to windows

If you are considering replacing your current windows or designing a new home,...
coastal-living

Coastal Living

Filled with natural materials and nautical touches, Max and Kate Lyons' wooden...
challenging-new-build

Challenging new-build

Don't be fooled by this fortress-like exterior: the walls conceal a light and...
a-modern-house-on-the-dorset-coast

A modern house on the Dorset...

Mike and Diane Smith thought their home of 40 years was forever, until the idea of a...
british-gypsum-couple-flexible-home-with-gyproc-habito

British Gypsum – Couple flexible...

After moving house in September 2015, Thomas Oliver and Erika Harris purchased a...
the-government-s-new-right-to-build

Right to Build

Ted Stevens discusses the government's new Right to Build... You may have heard...
balconette-launches-unique-frameless-juliet-balconies

Balconette launches unique...

New – Frameless Juliet Balconies from Balconette Now there is nothing to obscure...
a-radical-remodel

A Radical Remodel

Cat Knightley and Mav Gibbins worked hard to lovingly convert a...
transform-architects

Transform Architects

Transform Architects is an Award-winning RIBA Chartered Practice that specialises in...
plots-without-planning-consent

Plots Without Planning Consent

As a general rule there’s no use buying a plot of land without planning...

Expert videos

expert video2 2