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Your Home Addition Cost Estimate

Thanks, 73. Based on your selections, here’s your estimated cost range for a home addition in 121.

This estimate reflects your project size, features, and finish level to give you a realistic starting point.

This range is calculated using real project data from home additions across Maryland, Washington, DC, and Northern Virginia, tailored to your specific inputs.

Actual costs vary based on design, materials, site conditions, and structural requirements. Costs for design, architectural drawings, structural engineering, and permitting are not included and will vary by project.

Your Project at a Glance

Addition Type
46
Estimated Size
54
Finish Level
147147147147147147
Key Features
149

This summary reflects the details used to generate your estimate.

Estimated Timeline: 46

Recommended results-page timeline ranges by project type

Bump-Out

2–4 months

Rear / Side Addition

4–8 months

In-Law Suite

5–9 months

Second-Story Addition

6–10 months

ADU

7–12 months

Final timelines vary based on design, permitting, structural needs, and material selections.

Save Your Estimate for Later

Get a copy of your personalized estimate and next steps so you can plan with confidence.

What Influences Your Final Cost

  • Structural complexity and engineering requirements
  • Material selections and finish level
  • Permitting and local regulations
  • Overall design scope and layout changes
These factors are why two similar additions can vary significantly in price. Costs for design, architectural drawings, structural engineering, and permitting are not included in this estimate and will vary by project.
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ESTD. 1977

Ready for a More Accurate Quote?

This estimate gives you a strong starting point. The next step is a detailed consultation where we refine your scope, confirm pricing, and map out your project.

Book a Home Addition Consultation

Trusted by Homeowners Across the DC Area

My wife and I hired Hopkins & Porter for a major remodeling job on our home. We could not be happier with the end results! They understood what we were looking for and turned it into reality.
Scott C.

Germantown, MD

From the earliest stages of construction, Hopkins & Porter delivered excellence at every step. Their commitment to quality, coupled with meticulous craftsmanship, transformed our home.
Peter & Heather C.

Germantown, MD

We turned to Hopkins & Porter and were impressed with their willingness to be flexible and creative with the design and the construction details.
Susan M. & Arthur F.

Chevy Chase, MD

I would certainly recommend them for any project that you are considering. They are extremely honest, very well-meaning, and hardworking, and they always complete the project in a satisfactory manner.
Betsy N.

NW Washington, DC

What Happens Next?

[ Step 1 ]

Schedule your
consultation

[ Step 2 ]

Review your
design and scope

[ Step 3 ]

Receive a
detailed project
proposal

[ Step 4 ]

Start your home
addition with
confidence

Book a Home Addition Consultation