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How Much Does a Home Addition Cost in Maryland, DC & Virginia?

Use our 60-second calculator to estimate your home addition cost based on your space, design, and goals.

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  • Takes less than 60 seconds
  • Based on real DC-area costs
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Average Home Addition Costs in Maryland, DC & Northern Virginia

Planning a home addition in the DC metro area?

Costs can vary widely depending on the size, complexity, and level of finishes you choose.

On average, homeowners can expect:

$200–$500 per square foot for most additions

Small additions (under 500 sq ft): $100,000 – $250,000

Mid-size additions (500–1,200 sq ft): $250,000 – $500,000

Large or luxury additions: $500,000+

Factors such as structural changes, kitchen or bathroom upgrades, and high-end finishes can significantly affect your final investment.

That’s why we built this calculator. Instead of guessing, you’ll get an estimate based on your project.
Please note: costs for design, architectural drawings, structural engineering, and permitting are not included and will vary by project.

How Our Home Addition Cost Calculator Works

[ Part 1 ]

Tell Us About
Your Project

Answer a few quick questions about your addition type, size, and features.

[ Part 2 ]

We Calculate
Your Estimate

Our tool uses real DC-area cost data and project variables to generate your estimate.

[ Part 3 ]

Get Your
Personalized Range

See a realistic cost range based on your inputs, so you can plan with confidence.
Calculate Your Cost

Calculate Your Cost

[ STEP 1 ] Type of Home Addition

[ STEP 2 ] Estimated Size

[ STEP 3 ] Level of Finish

[ STEP 4 ] Rooms Included

[ STEP 5 ] Structural Complexity

[ STEP 6 ] Kitchen or Bathroom Level

[ STEP 7 ] Special Features

[ STEP 8 ] Property Location

[ STEP 9 ] Timeline

[ STEP 10 ] Budget Awareness

[ STEP 11 ] Contact Information

Frequency Asked Questions

This calculator provides a realistic cost range based on current pricing in Maryland, DC, and Northern Virginia. While every project is unique, it gives you a strong starting point before a detailed estimate.

Most home additions range from $200 to $500 per square foot, depending on size, finishes, and complexity. Total costs typically range from $150,000 to $500,000+.

Key factors include square footage, structural changes, kitchens or bathrooms, finish level, and special features like vaulted ceilings or large windows.

Most home additions take between 4 and 9 months, depending on size, design complexity, and permitting timelines.

Yes. Most home additions require permits and inspections. Requirements vary by location, but a professional contractor will handle this process for you.