🏘️ National Register Historic District Addition Specialists⭐ 4.9 Rating · 97+ Reviews✓ MHIC Licensed & Insured✓ In-House Architects & Engineers✓ Town Permit — 4600 Oxford Street📞 240.730.1292
Need more space in your Garrett Park, MD home? DMV General Contracting Group is a fully licensed, design-build home addition contractor serving Garrett Park, MD. We design and build all types of residential additions — room additions, second-story additions, master suite additions, bump-outs, family room expansions, and sunrooms — entirely in-house. Our team of architects, structural engineers, permit specialists, and licensed construction crews handles every stage of your project under one contract, from concept drawings to final inspection. Historic District Addition Expertise makes DMV General Contracting Group the right choice for every Garrett Park, MD addition project. Free in-home consultation. Call 240.730.1292.
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Historic District Addition Expertise — Why It Matters for Your Garrett Park, MD Addition
Garrett Park is a National Register Historic District — and home additions here require a contractor who understands what that means for exterior design, permit filing, and material selection. The Town of Garrett Park issues its own building permits at 4600 Oxford Street — not MoCo DPS at 2425 Reedie Drive. While the National Register designation does not technically prohibit exterior additions, it creates a strong community expectation that additions respect the original architectural vocabulary of the neighborhood's 1900s–1940s bungalows, cottages, and colonial revivals. An addition that is visually incompatible with the Garrett Park streetscape affects property value in a community that prices historic character measurably. DMV General Contracting Group designs Garrett Park additions to be contextually appropriate — in scale, material, and roofline — while delivering the modern interior spaces homeowners need.
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In-House ArchitectsFull architectural design & 3D renderings — no outside architect needed
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Structural Engineers On StaffLoad calculations, foundation review — all in-house
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Town Permit — 4600 Oxford StreetGarrett Park files with the Town — not MoCo DPS. Correct filing confirmed at consultation.
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4.9-Star Rated97+ verified homeowner reviews
Permit Authority for Home Additions in Garrett Park, MD
📋 Town Permit — 4600 Oxford Street
Town of Garrett Park at 4600 Oxford Street — not MoCo DPS. All additions within Town limits require Town of Garrett Park building permits. Contractor who files with MoCo DPS for Garrett Park faces rejection.
Home Addition Types We Build in Garrett Park, MD
Most Common
Single Room Addition
A new room built onto the side or rear of your existing home — bedroom, family room, or home office — fully integrated with the existing structure, roofline, and interior layout. Foundation, framing, roofing, electrical, HVAC, and all finishes included.
Cost: $120,000 – $220,000Timeline: 4–7 months
Most Value
Second-Story Addition
Add a complete or partial second floor above your existing home — maximizing square footage without expanding the footprint. Full structural engineering required. Adds the most square footage per dollar of lot used.
Cost: $200,000 – $420,000+Timeline: 6–11 months
Most Popular
Master Suite Addition
A dedicated primary bedroom and bathroom addition — one of the most popular additions in Garrett Park, MD. Includes spacious bedroom, walk-in closet, and luxury bathroom. Significant resale value addition.
Cost: $150,000 – $300,000+Timeline: 5–8 months
Lowest Cost
Bump-Out Addition
A targeted 2–12 foot extension of an existing room — expanding a kitchen, widening a master bath, or creating a breakfast nook. Faster and more affordable than a full room addition.
Cost: $40,000 – $120,000Timeline: 2–4 months
Family Favorite
Family Room Addition
Expand living space with a dedicated family room or great room off the rear of your home — often combined with kitchen expansion. Vaulted ceilings and large windows are the most popular design choices.
Cost: $130,000 – $260,000Timeline: 4–7 months
Year-Round
Four-Season Sunroom
A light-filled, fully conditioned addition with expansive windows for year-round use. Full HVAC connection, insulated walls, and heated floors. Perfect for rear yards with garden or wooded views.
Cost: $80,000 – $160,000Timeline: 3–5 months
Home Addition Cost in Garrett Park, MD
Addition Type
Typical Cost Range
Size
Timeline
Bump-Out Addition
$40,000 – $120,000
50–300 sq ft
2–4 months
Sunroom / Four-Season Room
$80,000 – $160,000
150–400 sq ft
3–5 months
Single Room Addition
$120,000 – $220,000
200–600 sq ft
4–7 months
Family Room Addition
$130,000 – $260,000
300–700 sq ft
4–7 months
Master Suite Addition
$150,000 – $300,000+
400–800 sq ft
5–8 months
In-Law Suite Addition
$140,000 – $270,000
400–800 sq ft
5–8 months
Second-Story Addition
$200,000 – $420,000+
600–1,800+ sq ft
6–11 months
Our Home Addition Process in Garrett Park, MD
1
Free In-Home Consultation & Feasibility Review
We visit your Garrett Park, MD home, confirm the correct permit authority — Town of Garrett Park at 4600 Oxford Street — review zoning and setback requirements, assess the existing structure, and discuss which addition types are feasible — at no cost. Realistic budget range provided before any design work begins.
2
Architectural Design & 3D Renderings
In-house architects develop concept plans, floor layouts, and 3D renderings refined until they reflect your vision — reviewed by our construction team to ensure buildability within budget.
3
Structural Engineering & Permit Submission
In-house structural engineers perform load calculations and specify all structural elements. Complete permit package submitted to the Town of Garrett Park. All permit correspondence managed in-house.
4
Foundation, Framing & Exterior Construction
Site preparation, footings, foundation, and structural framing completed by our licensed crews. Exterior roofing, siding, and windows installed to match your home's existing exterior materials and profile.
5
Mechanical Rough-In & Interior Finishes
Licensed electricians, plumbers, and HVAC technicians extend all systems into the addition. Interior finishes installed — matching or upgrading your home's existing standard. All permit inspections managed in-house.
6
Final Inspections, Punch List & Walkthrough
All required final inspections scheduled and managed. Thorough punch list walkthrough before project close. Written warranty documentation provided.
Frequently Asked Questions — Home Additions in Garrett Park, MD
A bump-out runs $40,000–$120,000. A single room addition runs $120,000–$220,000. A master suite addition runs $150,000–$300,000+. A second-story addition runs $200,000–$420,000+. All costs include in-house architectural design, structural engineering, permits, and complete construction through final finishes. DMV General Contracting Group provides free, detailed estimates during the in-home consultation.
Yes — all home additions require building permits, zoning approval, architectural drawings, and trade permits for electrical, plumbing, and HVAC. DMV General Contracting Group's in-house permit team handles the entire approval process from submission to final inspection. You do not need to contact any permit office or manage any paperwork.
A bump-out takes 2–4 months. A single room addition takes 4–7 months. A master suite addition takes 5–8 months. A second-story addition typically takes 6–11 months. These timelines include design, permit processing, and construction — all managed in-house to minimize delays.
Yes. DMV General Contracting Group holds Maryland MHIC license #156178. Fully bonded, comprehensive general liability and workers' compensation insurance, and 1-year workmanship warranty on every addition project in Garrett Park, MD.
Garrett Park Historic DistrictStrathmore AvenueRokeby AvenueOxford Street AreaMARC Station CorridorKenilworth Avenue
Ready to Add On to Your Garrett Park, MD Home?
Call us at 240.730.1292 or schedule your free consultation. Our architects and permit specialists will review your property and tell you exactly what's possible — 7 days a week.
