What affects the cost of a home addition?
An addition means building new space and connecting it successfully to an existing structure. Several decisions can change the scope significantly.
Type of addition
Type of addition
Size
Size
Foundation and structure
Foundation and structure
Finish level
Finish level
Mechanical tie-ins
Mechanical tie-ins
Existing property conditions
Existing property conditions
How does the home addition cost calculator work?
The calculator builds a personalized, all-in planning range from the details you select. The ranges are based on real completed-project costs, and they include design, planning, and permitting, not just construction. Pricing assumptions are reviewed by Ben Anderson, Owner.
The result is a planning range, not a fixed quote. Final pricing depends on the property, completed plans, selections, engineering requirements, and other project-specific conditions.
Who is behind the calculator?
Anderson Construction is an owner-operated builder that has been building custom homes, renovations, and additions since 2006. We serve homeowners in Cherry Hills Village, Greenwood Village, Castle Pines, Evergreen, and Golden. See completed projects in our portfolio, read what past clients have shared on our testimonials page, or explore our full home addition services when you are ready to move from estimating to planning.
What should you do with your addition estimate?
Use the planning range to compare different versions of the project and understand which decisions have the greatest effect on your budget. When you are ready to discuss the property itself, book a discovery call. We will talk through what you want to add, what you know so far, and the next step. A site visit is available whenever you are ready.
Frequently Asked Questions
Is the home addition calculator estimate a quote?
No. The calculator provides a personalized planning range based on the information you enter. Formal pricing requires a fuller evaluation of the property, plans, selections, structural requirements, and scope.
What affects home addition cost the most?
The major factors include the type and size of the addition, foundation and structural requirements, finish level, mechanical tie-ins, and the conditions of the existing home and property.
What types of additions can I estimate?
Extra living space, a primary suite, a second story, a garage, and an in-law suite or ADU.
Does the calculator account for foundation and structural work?
Yes. Foundation and structural choices are part of the estimate. Final requirements still depend on the property, engineering, and completed plans.
Can the calculator tell me whether an ADU is allowed on my property?
No. The calculator is a cost-planning tool, not a zoning or feasibility determination. Whether an ADU is possible depends on the specific property and applicable requirements.
Why can the final addition price differ from the calculator?
The final scope can be affected by site conditions, structural requirements, completed design work, detailed selections, and how the addition must connect to the existing home. Those details cannot be fully evaluated online.
What areas do you serve?
We serve Cherry Hills Village, Greenwood Village, Castle Pines, Evergreen, and Golden.