build cost difference : bungalow versus bungalow with converted attic

EdsBand

Hi
Does any one know if there is much cost difference between
- building a bungalow
- building the very same bungalow (same ground area) but with the attic converted (and 2 velux windows added)

I know it may seem like a silly question but if i was to build a bungalow with a converted attic do i need to consider other non-obvious cost factors
- does roof need to be bigger (and therefore most cost)
- are dearer roof trusses needed
- does the roof pitch need to be different (and therefore perhaps most cost)

Currently I'm trying to design a house where cost is a big factor
I know that 2 story is cheaper to build than bungalow (smaller foundation and roof ).
However is it much more for me to build a bungalow and use the attic space (than just leave it as an attic)
OR another way of putting it -> is it relatively cheap to convert the attic WHEN i'm building a bungalow

Gumbo

Roof structure for use.
Access.
Increased floor area from a planning perspective.
Additional windows for means of escape.
Finishes.
Fire detection.

Calahonda52

Retro-converted attic in a traditional bungalow is a PITA to get right from an airtightness/insulation / etc perspective.
Also can be difficult to get the right heights to make the rooms habitable.
Ceiling joists will need to be deep enough to support the attic, else you will need steel beams etc, another world of hurt.
If doing it, stick a window in each gable at planning time
What about a 1.5 storey?

EdsBand

Thanks Calahonda52 and kceire for your replys

Is it easier (and cheaper) to build the bungalow (with attic conversion) from scratch rather than retro fit existing bungalow (i.e. am i gaining a little because I can plan it instead of trying to retro fit an existing plan)

Also is it cheaper to build a 1.5 bungalow instead of a bungalow where the attic space is converted into rooms?
Or am i better off just building 2 story? Perhaps I'm not saving enough in building a bungalow (with converted attic) to justify it. Maybe i just need to build the 2 story (and i get the extra space upstairs for a relatively negligible price )

dragonfly!

Hi
We intended on building a bungalow but with the space for an attic to be converted in future years
We designed it this way but then when we were getting the roof done the man doing this also put up some partion walls for us in the attic so they are done when we need them.
We got a price for the stairs and put it in. On the basis of itll be done and we wont have to be digging up the place then again later.
We also put internal doors in as buying 2 more in the grand scheme of things didnt cost a lot more
It'll be a long time before we do any more work on that