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Roundhill, null — Home Additions

Home Additions in Roundhill, null

25
Years
4.7★
Reviews
7,361+
DMV projects

Trusted home additions for Roundhill, null homeowners — design, build, and finish by MOSS.

Typical Investment in Roundhill

$145,000 to $790,000

01Roundhill

Home Additions in Roundhill

MOSS Building & Design brings full-service home additions to Roundhill, and the surrounding DMV. Our in-house design team and production staff handle every stage under one contract, from initial design through final inspection.

Permits & Jurisdiction

Home Additions projects in Roundhill require building permits from the local jurisdiction. MOSS manages all permit applications and county communications on your behalf.

02Our Process

How home additions works in Roundhill

03Typical Investment

Home Additions cost in Roundhill

Roundhill Range

$145,000 to $790,000

Home Additions · typical MOSS investment

Final scope shapes your investment — material grade, structural changes, and Roundhill permit timelines all move the number.

Range reflects MOSS projects completed in Roundhill. Final investment depends on scope, material selections, and permit requirements. Last reviewed: 2026-07-10T16:51:02.954Z.

04Materials Guide

Compare your options

05In Real Homes

What home additions looks like in Roundhill

Top 4 Addition Types for DMV Homes

  1. Pop-Top (Second Story)

    Doubles livable space without expanding the footprint.

  2. Rear Bump-Out

    The most cost-efficient way to expand a kitchen or family room.

  3. In-Law Suite

    Self-contained living space for multi-generational families.

  4. Sunroom/Four-Season Room

    Year-round outdoor living with climate control.

3 Things to Know Before Your Home Addition

  1. Setback requirements limit your options

    Every jurisdiction has setback rules. Check before you design.

  2. Foundation type affects everything

    Slab, crawl, or full basement — this decision drives cost and timeline.

  3. Tie-in is the hardest part

    Where new meets old is where craftsmanship matters most. Rooflines, siding, and interior transitions require expert execution.

Our pop-top gave us three bedrooms and a bathroom we didn't have. The kids finally have their own rooms.

— The Martinez Family, Arlington VA

m·o·s·s

06Portfolio

Home Additions projects in Roundhill

Portfolio in Progress

We're photographing more Home Additions projects in Roundhill — check back soon.

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07Local Questions

Home Additions in Roundhill — common questions

Home Additions in Roundhill typically ranges $145,000 to $790,000. The final investment depends on scope, material selections, and site conditions specific to your Roundhill home. MOSS provides itemized estimates before any work begins, so contact us for a personalized consultation.

Yes, most home additions projects in Roundhill require a permit from your local building department. Any project involving structural changes, electrical upgrades, or plumbing modifications must be permitted and inspected. MOSS manages all permit applications, submissions, and required inspections on your behalf.

Most MOSS home additions projects in Roundhill take 2 to 6 months from design kickoff to final walkthrough. The timeline includes 4 to 6 weeks for design, a few weeks for permit review at your local building department, and 6 to 16 weeks of active construction depending on project scope.

Yes, MOSS Building & Design actively serves Roundhill and surrounding communities throughout the DMV. Our in-house team has completed numerous home additions projects in Roundhill and knows the local permit requirements, HOA processes, and neighborhood character that shape every build.

MOSS is a design-build firm that handles design, engineering, permitting, and construction under one roof. Unlike general contractors who subcontract the design phase, MOSS keeps the entire project integrated, which reduces miscommunication, compresses timelines, and gives Roundhill homeowners a single point of accountability.

A MOSS home additions project in Roundhill begins with a design phase covering space planning, material selection, and construction drawings. From there, MOSS handles all permit submissions, structural and MEP coordination, and active construction with our in-house production teams. Every project ends with a final walkthrough, punchlist resolution, and a one-year warranty on our workmanship.

Many Roundhill neighborhoods have HOA architectural review committees. MOSS prepares complete submission packages, including drawings, material selections, and project scope narratives, so your HOA review proceeds smoothly before construction begins.

Home additions in Roundhill create lasting value by adding permanent square footage, the single metric appraisers and buyers weigh most heavily. Well-designed additions in high-value Roundhill neighborhoods commonly recover 50% to 65% of construction cost in appraised value.

Still have a Roundhill home additions question?

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Begin Your Project

Start your Roundhill home additions project

One conversation with a MOSS designer is all it takes. We'll talk scope, materials, and your Roundhillhome — and you'll leave with a plan, not a pitch.

Call 703-459-9023