Extending roof height in bungalow

xabi · 21-10-2016 1:43pm #1

Im looking at extending into the roof of our bungalow and had an idea in my head of raising the outside walls by 4' and increasing the roof pitch to give as much floor space as possible upstairs. Spoke with a builder who said that raising the walls means that there will be steel required to 'hold' the roof and stop it spreading out. I currently don't have any headroom in the attic.

This makes sense as the tie beam (is that what its called?) needs to connect the outside wall. Are there any other ways of achieving this?

This is what im hoping to achieve without additional steel

Rather than this

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Gumbo · 21-10-2016 1:59pm

Have you thought about your planning requirements?

Adding 4" to the external wall may be the easy bit but the loads from the roof still have to be transferred down and that's where the steel comes in I presume.

What height increase do you expect to gain and will it be worth the considerable cost?

xabi · 21-10-2016 2:14pm

A few neighbours have already raised the pitch and got 3 double bedrooms in, in raising the wall I'd hope to get a similar floor space as the ground, a bit less but better than just raising the pitch.

sydthebeat · 21-10-2016 5:37pm

when there is no structural "tie" between the rafters and floor joists then in most cases steel is required, or engineered trusses.

in your example there is no tie.

what you want to do requires planing permission and requires structural engineers input.

xabi · 21-10-2016 5:40pm

sydthebeat wrote: »

when there is no structural "tie" between the rafters and floor joists then in most cases steel is required, or engineered trusses.

in your example there is no tie.

what you want to do requires planing permission and requires structural engineers input.

Thanks, I'm aware of the planning etc. Is there a particular name for these engineered trusses?

sydthebeat · 21-10-2016 7:12pm

xabi wrote: »

Thanks, I'm aware of the planning etc. Is there a particular name for these engineered trusses?

nope,

a 'truss roof' is prefabricated

a 'cut roof' is built on site

LilianMacA · 05-04-2020 9:12pm

Hi Xabi, did you go ahead with the upwards extension? I'm considering doing the same and I'm looking for a general idea of how much it would cost... Appreciate any help! Regards

Yellow_Fern · 08-04-2020 11:04am

I have this done on a standard Irish bungalow in Passive plus about a year ago. Although it can make the building look a bit odd, they used external insulation which bulked out the walls and the final house was in my opinion more attractive and more traditional stylistically than before.

Extending roof height in bungalow

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