Home Additions on the Main Line
A Main Line addition has to match stone, roof pitch and window style closely enough that it looks original. On steep or wooded lots, where it can sit is shaped by grading and tree protection as much as by zoning. We handle the drawings, the local permits and the build, and price your project at a free on-site walkthrough.
Build your estimateHome additions for Main Line homes
Main Line homes are often 1900s–1940s stone colonials, Tudors and estates with plaster walls and deep stone foundations.
- Stone and trim sourced to match the original house as closely as practical.
- Additions sited around protected trees and slopes before the floor plan is fixed.
What affects projects on the Main Line
- Several Main Line neighborhoods fall under historic review, which can add a design approval step before the building permit.
- Mature trees and steep lots often bring tree protection and grading review into the plan.
Additions that read as original
Main Line architecture is unforgiving — Tudor half-timbering, Colonial Revival cornices, Wissahickon schist, slate roofs, and true divided-light windows. A new wing that misses the brick coursing, the mortar color, or the roof pitch announces itself forever. We source matching stone and millwork, replicate trim profiles, and detail the transition so the addition is invisible from the street.
Permits & local rules on the Main Line
Plans are reviewed by the Lower Merion, Radnor or Tredyffrin code office, depending on your address. We file and track every permit for you.
- Step 1. Zoning review: setbacks, lot coverage and height limits set by the Main Line's local zoning rules.
- Step 2. Building permit filed with the township or borough code office serving the Main Line (Pennsylvania Uniform Construction Code), using our in-house drawings.
- Step 3. Zoning variance hearing if the addition exceeds setback or coverage limits.
- Step 4. Stormwater review when new roof or paved area crosses the local threshold.
- Step 5. Footing, framing, rough-in, insulation and final inspections.
Exact requirements depend on your property. We confirm them with the local office at your walkthrough.
How your home addition gets built
Every step, start to finish, handled by one design-build crew.
- 1Week 1
Site visit
We review lot lines, zoning, and how the addition ties in.
- 2Weeks 2–10
Drawings & zoning
In-house plans, engineering, and township approvals.
- 3Weeks 10–13
Foundation
Excavation, footings, and foundation walls.
- 4Weeks 13–17
Framing & roof tie-in
Walls, roof, windows, and weather-tight shell.
- 5Weeks 17–20
Rough-in & insulation
Electric, plumbing, HVAC, inspected before drywall.
- 6Weeks 20–26
Finishes & occupancy
Interior finishes, siding matched to the house, final permit.
Build your home addition estimate on the Main Line
Your project scope and material selections help us prepare for your free on-site walkthrough.