Front Range, Colorado · Home Additions
Second Story Addition Cost per Square Foot on the Front Range
A second story adds space without giving up your yard. Here is what it costs with Josh Brooks Construction, what drives the price, and how the build works.
How Much Does a Second Story Addition Cost?
Home additions with Josh Brooks Construction cost $250–$450 per square foot finished, with engineering and permits included. A second story addition falls in that range depending on structure, roof work and finish level.
| Second story size | Estimated cost ($250–$450/sq ft) |
|---|---|
| 400 sq ft | $100,000–$180,000 |
| 600 sq ft | $150,000–$270,000 |
| 800 sq ft | $200,000–$360,000 |
| 1,000 sq ft | $250,000–$450,000 |
Your exact price comes from a site visit and a written, itemized estimate.
What Drives Second Story Addition Cost
- Structure: an engineer checks whether the existing walls and foundation can carry a second floor. Some homes need added posts, beams or footings.
- Roof: the existing roof comes off and a new one goes on top. We install only Class 4 impact-rated shingles with all new metals and flashing.
- Stairs: a new stairway takes space from the first floor and has to meet code.
- Bathrooms: plumbing runs to a second floor add cost.
- Finish level: flooring, trim, windows and fixtures.
Second Story vs. Ground-Level Addition
A second story keeps your yard and works on tight lots. A ground-level addition avoids removing the roof and is often simpler to live through. We price both options when your lot allows it. Read our guide to Boulder County permits for home additions.
Why Hire Josh Brooks Construction for an Addition
- Licensed general contractor: Boulder County CON-24-0152 (Class C), Jefferson County Class C, Douglas County Class A
- In business since 2014; Josh has worked in construction since 1996
- One contract covers every trade, so there is no juggling separate subs
- Free, itemized written estimates before any work starts
- Senior and veteran discounts on every project
See our home additions page, or city pages for Broomfield.
Frequently Asked Questions
How much does a second story addition cost per square foot in Colorado?
With Josh Brooks Construction, home additions including second stories cost $250–$450 per square foot finished, with engineering and permits included.
Can my house support a second story?
Many can, but it takes an engineer’s review of the existing walls and foundation. Some homes need added beams, posts or footings first.
Do I have to move out during a second story addition?
Often yes for part of the build, because the roof comes off. We plan the schedule with you during the estimate.
Get a Free Written Estimate in Colorado
Josh Brooks Construction and Renovation Inc. has been in business since 2014, and Josh has worked in construction since 1996. One licensed contractor, one contract, and the owner accountable for the job. Senior and veteran discounts on every project (details).
Call 720-828-7997 or text 720-453-5095.
