Home additions and accessory dwelling units add rooms, floors or a separate living space to an existing house. JDG builds additions across Long Island starting with the trade we know best, footings and foundations, then frames, roofs and finishes the new space so it ties into the old house without letting water in at the seam.
What is included
- Lot and feasibility review
- Design coordination with your professionals
- Excavation sized to the plan
- Footings and poured foundation
- Framing and roof tie-in
- Windows, siding and roofing
- Insulation, drywall, trim and paint
Why it lasts
Everything above an addition depends on the foundation under it. We plan drainage where the new foundation meets the old one, so water never collects at the joint between the two structures.
ADUs depend on your town's rules, so we talk through that early. Families in Stony Brook, Mount Sinai and Smithtown usually stay home during the build, with every scope change agreed in writing.
Questions homeowners ask
Can I build an ADU on my property?
It depends on your town's rules and your lot. We talk through that early, before you commit to a plan.
Who handles the foundation for an addition?
We do. Footings and foundations are concrete work, the trade JDG started with.
Do I need architectural plans and permits for an addition?
Yes. Additions need drawings and a building permit from your town. We coordinate with the design professionals your project needs so the plans reflect how the job will actually be built.
