The key element to any successful home addition project begins with a plan. Structural, mechanical, door and window schedules must be developed prior to submission for permits. It is only with a developed set of drawings that a proper estimate can be completed and true costs established. The costs associated with this phase is dependent on the size and scope of the project. These fees are not included in the construction costs.

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Phase 1 Approximate Cost

$1500-$7500

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The second phase begins with preparing the work site for the structural addition. Depending upon the plans and specifications, this may include the digging of a foundational pad, basement footer,or crawl space footer. In step 2 of a ground addition site prep, concrete block is typically placed upon the footer structure to build a foundation for the white box.

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Phase 2 Approximate Cost

$25-$45/ft²

The "white box" includes exterior and interior structural and mechanical components:

Rough in of electrical & plumbing interior primed drywall, windows, doors, flooring, siding, roofing, 
 
Once the shell is complete, the interior finishes are to be determined by the client and space functionality (kitchen, bathroom, etc). This cost is driven by the finish materials, fixtures, cabinetry, and trim packages chosen by the client.

 
Phase 3 Approximate Cost*
White Box Only : $75-$80/ft²
 
*Final finishing costs vary significantly by project & client