Cost for basement and first floor addition

Question Icon
Posted by: from Ottawa
2/19/2016 at 10:06:04 AM


We are looking for a rough estimate for the following project. We want to know if what we expect is actual or if we are way off in terms of cost.

We live in Ottawa and would like to add a 20x20 addition off our dining room. This would include a full finished basement and a first floor living room. There will be no changes to any washrooms or the kitchen, just straight living space.

Thank you,


User Icon
Date/Time2/19/2016 at 10:36:35 AM

Dev. permit and other permits needed 1st (not inl. as these costs range by province here in alberta about $1500).. for excavations and proper foundation/pad (we use ici forms) to exisiting basement you will be looking @ approx. $90-$140,000 depending on variable of site and materials you want used.

Cost for basement and first floor addition
User Icon
Date/Time2/19/2016 at 11:16:26 AM

Hello Julie,

You didn't mention anything about the roof which is an important parameter in evaluating the project, anyhow, I estimated a similar case last week, and the estimation varied between 67,000$ and 73,000$; this variance is due to lack of details, but roughly that's what you're expecting.

FB Home Builders Inc.

G.C: Faysal Budayr

User Icon
Date/Time2/19/2016 at 5:51:24 PM

Hi Julie,

What your planning involves every aspect of construction; framing, concrete, insulation, HVAC, electrical, roofing, envelope, the works. Definitely the type of job for a professional contractor. If you were doing this work in Vancouver you would plan to spend $150,000 to $250,000. The variance would depend on what happens during the design phase.

I hope this helps. Good luck.

User Icon
Date/Time2/21/2016 at 9:29:31 AM

Hi Julie,

We have priced similar projects and the cost does have some variances depending on finishes etc.

Our estimated cost to do this project would be between $58,000 - $70,000 which would include design/permit drawings, engineering costs and mid-level finishes.

Please let me know if we can be of further assistance.



User Icon
Date/Time2/21/2016 at 6:29:12 PM

$150-$250 per sqft.

Search the TrustedPros directory and discover the best contractors in your area.

Find your home service pro
Great renovations start with a great contractor.

Since 2004, TrustedPros has been helping homeowners find the right contractor for their home improvements and repairs.

Post Your Project

Within hours you'll be comparing offers from top-rated professionals. It's free to post and you're under no obligation to hire.

Trustedpros Inc. does not warrant the accuracy, completeness, safety, legality or usefulness of any Content, or Whether Content is Current and up-to-date, and TrustedPros Inc. Shall have no liability whatsoever with respect to your use or reliance upon any content or for content being removed or otherwise ceasing to be available. Please refer to the terms and conditions of use of this websites for more details.

Get Free Estimates

Post your project and compare offers from top-rated pros.