Ballpark for home bump out cost

12/18/2020 at 10:17:53 AM

Hi Julie,

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12/18/2020 at 3:09:19 PM

We are located in Calgary Alberta, so any costing data that I could add will most likely not apply to the Caledon area. However, the main cost for doing a bump-out that can get a bit out of control are the foundation, wall finishes, and roof finishes, as these are the toughest to"match-up" to existing finishes. Where in some cases you may need to redo the whole entire side of a home, or possibly the entire exterior of the home to blend everything in. These three main factors can have a huge spread in cost that would all need to be blended into the bump-out cost. Of course the interior finishes will also play into the cost equation, for example adding a lower end kitchen vs higher end kitchen.

The foundation cost can be softened by using engineered screw piles, instead of a full foundation, however care must be taken in adding an extra sub-dropped floor under the main addition floor structure to create an added air space between the insulation and the sub-floor. Mechanical runs can also be an issue, where good planning can help soften these costs.

The other mian cost to look at is "structural cost" meaning how do you hold up the existing structure, such as roof or floor over, where you want an exterior wall removed. This is where you need a good designer and engineer to look at the project, in most cases the use of properly installed LVL beams can solve this issue.

The example bump-out renovation indicated below is one of our most popular kitchen bump-out plans, it helps solve a bunch of cost issues, first, the diagonal design allows for all addition walls to tie-in without having to directly blend exterior materials into each other, and gives a clean termination point, second the entire bump-out can be supported by a single engineered screw-pile at the outside corner, with everything else tied back to the main home foundation. Third, this plan adds a great deal of added open space without actually adding that much more sq. footage!

Good Luck with your project

Greg Genereux CEO Landen Development

12/22/2020 at 7:01:27 PM

Hi,

Reading your work description you FIRST need city permit and for that you need drawings with stamp, HVAC calculations, engineering drawings, if your property is in conservation area you will need contour survey.

After the drawings are prepared any contractor can give you proper quote. Your job is starting form 150K as you have one kitchen and a washroom and both of these items are costly in house when you break down to sft. price.

Thanks

Nick