% cost of parts of building a house

Nuala1974

Hi - I'm currently trying to work out a build option for my house. Can anyone please tell me how the cost is usually distributed in terms of % for each part? For example - foundations % of cost & so on , block work, roof, triple glazed windows & doors, plumbing, electrics, etc. I've done a bit of googling but can't find anything. I'm looking for approximate breakdown - if possible.
Im considering SIP, Timber framed & block built. I am getting prices for SIP & TF - supply & erection - but not sure how much I need to then budget (& raise) then for the remainder.
So let's say I get a 100sqm bungalow TF or SIP supplied & erected for €35000 - what approx. % of the overall cost would this be?
Sorry I hope this isn't confusing!
I appreciate any info anyone can give me.
Thanks

Gumbo

Nuala1974 wrote: »

Hi - I'm currently trying to work out a build option for my house. Can anyone please tell me how the cost is usually distributed in terms of % for each part? For example - foundations % of cost & so on , block work, roof, triple glazed windows & doors, plumbing, electrics, etc. I've done a bit of googling but can't find anything. I'm looking for approximate breakdown - if possible.
Im considering SIP, Timber framed & block built. I am getting prices for SIP & TF - supply & erection - but not sure how much I need to then budget (& raise) then for the remainder.
So let's say I get a 100sqm bungalow TF or SIP supplied & erected for €35000 - what approx. % of the overall cost would this be?
Sorry I hope this isn't confusing!
I appreciate any info anyone can give me.
Thanks

Each house is different.
I've drawn extensions where the conservatory cost 100k alone within a contract price of 1.3m.

Foundations for a bungalow will be a bigger % cost than for a 2 storey. Have you a QS engaged as these types of figures would be produced by them.

Nuala1974

kceire wrote: »

Each house is different.
I've drawn extensions where the conservatory cost 100k alone within a contract price of 1.3m.

Foundations for a bungalow will be a bigger % cost than for a 2 storey. Have you a QS engaged as these types of figures would be produced by them.

Thanks Kceire - I don't have a QS no - I'm trying to get rough %ages to plan a bit with view to gaining a better understanding & getting specifics at a later date. I though it may be possible to get a rough breakdown idea - but maybe not?
Thank you

mike_2009

There's a blog on selfbuild.ie that offers a breakdown for a two storey house you could adapt?

"This is based on an average detached home on two floors.

Site Clearance 3%
Foundation 9%
External Walls 17%
Roof 9%
Windows and External Doors 7%
Upper Floor 2%
Stairs 1%
Internal Walls 2.5%
Internal Doors 2.5%
Floor Finishes 4%
Wall Finishes 5%
Ceiling Finishes 2%
Heating 6%
Electrical Installation 4%
Water Installation (Cold/Warm) 2%
Waste & Sanitary 7%
Kitchen 5%
Built In Cupboards 1%
Professional Fees 11%"

Source:
http://blog.myhome.ie/2004/02/25/self-build-estimating-your-building-costs/

Still rough enough - you might get the timber frame kit for 35K but that won't include the foundation, site clearance / services, development fees including planning permission etc. So say 220K build cost your timber frame kit would be 16% of that cost (€2200 psqm). On top of this add services connections, development contributions, land, architects & surveyors fees, insurances etc. I got a QS to do mine for a few hundred which was great value but I have Architect sketches already to base it off.

Nuala1974

mike_2009 wrote: »

There's a blog on selfbuild.ie that offers a breakdown for a two storey house you could adapt?

"This is based on an average detached home on two floors.

Site Clearance 3%
Foundation 9%
External Walls 17%
Roof 9%
Windows and External Doors 7%
Upper Floor 2%
Stairs 1%
Internal Walls 2.5%
Internal Doors 2.5%
Floor Finishes 4%
Wall Finishes 5%
Ceiling Finishes 2%
Heating 6%
Electrical Installation 4%
Water Installation (Cold/Warm) 2%
Waste & Sanitary 7%
Kitchen 5%
Built In Cupboards 1%
Professional Fees 11%"

Still rough enough - you might get the timber frame kit for 35K but that won't include the foundation, site clearance / services, development fees including planning permission etc. So say 220K build cost your timber frame kit would be 16% of that cost (€2200 psqm). On top of this add services connections, development contributions, land, architects & surveyors fees, insurances etc. I got a QS to do mine for a few hundred which was great value but I have Architect sketches already to base it off.

Thanks mike_2009
That's great - thanks for that info - I've a lot of learning to do!
I have a QS friend doing a block - SIP cost comparison for me to give me a better starting point and I'll post that when he has it done.
Cheers again
Nuala