Home Renovation Long Island, NY
Structural Renovations — Gut Rehabs, Additions, Foundation & Full-System Upgrades
Licensed, Insured & Local | Nassau & Suffolk | Full Permits & Engineering
Planning a Major Long Island Renovation?
Long Island homes — from 1950s Levitt ranches to sprawling colonials — often need more than cosmetic updates. We handle the structural, mechanical, and code-compliance work that transforms the bones of your home, bringing it into the modern era safely and beautifully.
Response within 2 hours
We’ll assess your space in person
Transparent pricing, no hidden fees
Professional results on schedule
Get Your Free Renovation Estimate
Complete Home Renovation Services
Structural, mechanical, and code-compliance work that transforms the bones of your home.
Gut Renovations
Complete tear-down to studs and rebuild for Long Island homes. New framing, insulation, electrical, plumbing, HVAC, drywall, and finishes. We specialize in mid-century ranches, split-levels, and colonials.
Additions & Extensions
Room additions, second-story additions, bump-outs, and garage conversions. Full architectural coordination, foundation work, structural engineering, and code-compliant construction.
Electrical System Overhaul
Full rewiring, 200A panel upgrades, dedicated circuits, whole-house surge protection, and generator hookups. Replacing outdated wiring in Long Island’s older housing stock.
Plumbing & Sewer
Full replumbing, water main replacement, sewer line repair, water heater upgrades, and well/septic coordination for Suffolk County homes. Cast iron to PVC conversions.
HVAC Replacement
Furnace and AC replacement, duct installation, ductless mini-splits, whole-house dehumidifiers, and energy-efficient system upgrades. Sized for Long Island’s coastal climate.
Exterior & Envelope
Roof replacement, siding installation, window upgrades, insulation, and waterproofing. Energy-efficient exterior renovations that reduce utility costs and increase home value.
From Vision to Reality
A proven approach that keeps your renovation on time, on budget, and stress-free.
Design & Engineering
We assess your home’s structure, develop plans with engineers, and create a detailed scope.
Permits & Prep
We handle all permits, material ordering, and prepare the work area with full protection.
Construction
Expert buildout with weekly updates. We coordinate all trades and maintain a clean job site.
Final Walkthrough
Inspections, certificate of occupancy, punch list, and full cleanup. Your home, transformed.
Serving All of Long Island
Professional home renovation services throughout the area.
What Long Island Homeowners Say
“Our 1957 Levitt ranch was stuck in time. GCMM did a complete gut renovation — new electrical, plumbing, HVAC, insulation, and opened up the entire floor plan. It’s like a brand new house. They handled every permit and inspection.”
“GCMM built a 600 sq ft addition on our colonial for a new master suite. Foundation, framing, roofing, mechanical systems — they coordinated everything. The addition matches the existing house perfectly.”
“We needed a full rewire and panel upgrade on our 1960s home. GCMM’s crew was meticulous — they fished wire through walls without destroying plaster, upgraded to 200A service, and passed inspection first try.”
Home Renovation FAQs
Ready to Transform Your Long Island Home?
Get a detailed, no-obligation quote for your home renovation project. We’ll review your plans and provide a comprehensive proposal.