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Main Line PA

Home Additions on the Main Line

Seamlessly integrated home additions for Main Line properties — first-floor extensions, second-story additions, sunrooms, and bonus spaces designed by architects to match your home's original character.

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Home Additions — MM Home Improvements
One Project
at a Time
Architects
on Every Project
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A home addition is the most permanent renovation decision you can make, and it must be done right — architecturally integrated, structurally sound, and finished to a standard that makes the addition indistinguishable in quality from the original construction. MM Home Improvements specializes in additions that honor the character of Main Line homes, which is a particular skill on a line of properties dominated by pre-war stone, brick, and frame construction with architectural details that are difficult to match.

Our additions begin with an architect who studies your home's existing character: roof pitch, stone coursing, window proportions, cornice profiles, and setback. The addition's design respects these cues so that from the exterior, the new structure reads as part of the original architecture rather than an obvious appendage. This is the difference between an addition that enhances your home's value and one that diminishes it.

Serving: Ardmore Berwyn Bryn Mawr Devon Haverford Malvern
Home Additions craftsmanship detail

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How We Approach Home Additions

We execute all addition types: first-floor rear extensions to expand kitchens or create open family rooms, side additions to widen the floorplan, second-story additions over garages or single-story wings, sunrooms and enclosed porches, and detached garage structures. Each type involves different structural, permit, and design challenges, and we have executed all of them in Bryn Mawr, Wayne, Berwyn, Devon, and throughout the Main Line.

On the structural side, we work with licensed structural engineers for all additions — particularly critical for second-story additions over existing structures and additions that involve removing load-bearing walls to open up the connection between new and existing space. The engineer's stamped drawings are required for permits and ensure that the structure performs correctly for decades to come.

Benefits

Why Choose MM Home Improvements LLC

Architect-designed additions that match your home's original character — roof pitch, window proportions, exterior material, and cornice profiles studied and replicated

Licensed structural engineer involvement for all load-bearing modifications and second-story additions

Interior finishes matched to your existing home: crown molding, flooring species, door casing profiles, and paint colors

Full permit management in all Main Line municipalities — Lower Merion, Radnor, Tredyffrin, Easttown, Narberth Borough, and more

One project at a time dedication: your addition is the only project our crew works on

Seamless connection between new and existing space — no cold joint visible inside or out

Our Home Additions Process

How It Works

1

Site assessment and design consultation.

We walk your property with the architect, assess the addition location and configuration options, and discuss zoning setback constraints, HOA restrictions, and neighborhood character.

2

Architectural design and structural engineering.

The architect produces design drawings; the structural engineer stamps the structural plans. We submit for building permits and zoning approval.

3

Pre-construction planning and material ordering.

We coordinate all subcontractor schedules and order any specialty materials (matching stone, brick, or siding) with appropriate lead times.

4

Foundation and framing.

We excavate and pour the foundation, frame the addition structure, and connect to the existing structure per the engineered drawings. Roofing and weatherproofing complete before interior work begins.

5

Rough-in and finish work.

Plumbing, electrical, and HVAC extended into the new space, followed by insulation, drywall, flooring, millwork, painting, and fixtures — finished to match the existing home throughout.

Home Additions — Main Line PA renovation

Frequently Asked Questions

How much does a home addition cost on the Main Line?
Home addition costs vary significantly by type, size, and finish level. A modest first-floor rear extension of 300–400 sq ft with standard finishes typically runs $150,000–$200,000. A larger first-floor addition of 600+ sq ft with high-end finishes — or any second-story addition — typically runs $200,000–$400,000+. The per-square-foot cost of an addition is always higher than new construction because of the complexity of connecting to an existing structure.
How long does it take to build a home addition?
A first-floor home addition typically takes 4–7 months from contract to completion: 6–8 weeks for design, permit, and engineering; 2–3 weeks for foundation and framing; and 8–14 weeks for mechanical rough-in and finish work. Second-story additions require more time for engineering and inspections. We produce a detailed project schedule at contract signing.
Do you match the existing exterior — stone, brick, or siding?
Matching exterior materials is one of the most important and challenging aspects of addition work on the Main Line. For stone homes, we source matching fieldstone or cut stone from quarries used by the original builder, or from regional suppliers who can match the coursing and color. For brick, we source reclaimed or contemporary brick to match the existing. We do not take shortcuts here — the visible connection between old and new construction is where additions succeed or fail aesthetically.
What zoning approvals do we need for a home addition?
Zoning requirements vary by municipality and lot. All additions require building permits. Additions that expand beyond current setback lines or exceed allowable lot coverage require a variance from the zoning hearing board — a process we have navigated many times in Lower Merion, Radnor, and Tredyffrin townships. We assess zoning constraints during the initial consultation and advise on whether variance applications will be needed.

Ready to Start Your Home Additions Project?

Every great renovation begins with a conversation. Tell us about your home — we'll respond within one business day.

(267) 269-5879 Request a Consultation