Terra Nova Roofing & ConstructionGarage Conversion in New Jersey: Rahway, Summit & Paramus
A garage full of boxes and no car in it? Terra Nova Roofing & Construction converts garages in Rahway, Summit, Paramus and across North and Central Jersey into home offices, bedrooms, gyms, family rooms and in-law space — with the floor, walls, insulation and the old door opening done properly, not just drywall over a cold slab.
Locally owned in Garfield, NJ • Licensed & insured • NJ Lic. #13VH13824700 • Hablamos español
Text a photo of the garage inside and out to 973-200-1617 and we'll tell you what we'd look at first.
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Who does garage conversions in New Jersey?
Terra Nova Roofing & Construction does garage conversions in New Jersey, turning attached and detached garages into finished living space for homeowners in Rahway, Summit, Paramus and the rest of Union, Bergen, Passaic, Morris, Essex and Hudson counties. We're a licensed and insured contractor (NJ Lic. #13VH13824700) based in Garfield. You get a free on-site visit and a written estimate with photos showing the exact price before any work starts, and financing is available for larger projects. Call or text 973-200-1617.
What New Jersey homeowners turn their garages into
Home office
A quiet room away from the kitchen and the kids, with its own door. One of the most common requests we get.
Bedroom or in-law suite
Ground-floor space for a parent, a returning college grad or guests. A bathroom changes the scope, so we plan it early.
Gym or hobby room
Rubber flooring, good lighting and ventilation for a home gym, music room or workshop that feels like part of the house.
Family or playroom
Extra living space off the main floor — often the most affordable square footage you can add to a house you already own.
Converting a garage keeps the footprint of the house the same, which is why many families look at it before an addition. Compare options on our home additions page.
Is your garage a good candidate for a conversion?
We look at these during the free visit. None of them is a deal-breaker on its own — they just shape the plan and the price.
| What we check | Good sign | Needs more work |
|---|---|---|
| Slab | Dry, fairly level concrete | Cracks, a strong slope toward the door, or water coming in |
| Walls | Sound framing or block, no rot at the bottom plate | Water staining, rot or damaged block |
| Ceiling height | Room for insulation and a finished ceiling | Low beams or a tight ceiling that limits the layout |
| Roof over the garage | Roof in good shape, no leaks | Older or leaking roof that should be fixed before finishing below |
| Utilities | Panel has room for new circuits | Panel is full; heating and cooling have to be worked out |
| Connection to the house | Door into the house already there | No direct access, or steps and grade changes |
What a real garage conversion involves
The difference between a garage that "has drywall" and a garage that feels like a room is in the parts you don't see once it's done:
- The floor: garage slabs sit low and are usually cold and sloped toward the door. Depending on the slab, the floor is typically built up and insulated so it's level and comfortable before the finished flooring goes in.
- The big door opening: the overhead door comes out and the opening is framed in, usually with a window or entry door, then finished outside with siding that matches the house so it doesn't look like a filled-in garage.
- Insulation: garage walls and ceilings are often uninsulated. Walls, ceiling and floor all need attention, or the room will be cold all winter.
- Heating and cooling: a converted garage needs its own comfortable temperature. We go over the options with you during design.
- Electrical: outlets, lighting and circuits for a living space are different from a garage with one bulb and an outlet for the freezer.
- Light and air: windows make the space usable as a real room and help it meet the rules for its intended use.
- The step into the house: raising the floor can change or remove the step between the garage and the house — a nice side benefit.
Attached vs. detached garage conversions
| Attached garage | Detached garage | |
|---|---|---|
| Feels like | Part of the house, especially with a door from the kitchen or hall | A separate space — good for an office, studio or gym |
| Utilities | Usually easier to extend from the house | Often need new runs from the house |
| Common uses | Family room, bedroom, in-law space | Home office, hobby room, workshop |
| Watch for | Shared wall details and the step into the house | Foundation, slab condition and the roof |
Either way, we look at the garage roof. As roofers, we'd rather fix a tired roof now than see a new room damaged by a leak — see Union County roofing.
Zoning, permits and parking: check before you design
Every town in New Jersey handles garage conversions a little differently. A few things are worth knowing before you fall in love with a floor plan:
- Permits: turning a garage into living space is a change to the house. We know local permit requirements for the work we do and will go over them with you before work starts.
- Parking and zoning: some towns have rules about off-street parking or how a space can be used. Your town's zoning office is the place to confirm what applies to your property.
- HOA or condo rules: if you're in an association, check its rules on exterior changes like removing the garage door.
- Bedrooms: a room meant for sleeping has stricter requirements, including how you'd get out in an emergency. Tell us early if that's the plan.
Selling in a few years? Ask how the conversion will look to future buyers. Some buyers want the garage, others want the room. We'll talk it through honestly.
How a garage conversion runs with Terra Nova
Consultation
We look at the slab, walls, roof and utilities and talk about how you'll use the room.
Design choices
Layout, windows, the old door opening, flooring, lighting and finishes.
Written estimate
A free written estimate with photos and the exact price before any work begins. Financing is available for larger projects.
Demo & rough work
Door removal, framing the opening, floor build-up, insulation, electrical and any plumbing rough-in.
Finishes
Drywall, flooring, trim, doors, lighting and exterior siding to match the house.
Final walkthrough
We go over the finished room with you. Every job carries our workmanship guarantee.
What changes the price of a garage conversion
We don't quote garage conversions over the phone, because the garage itself decides most of the cost. The biggest factors:
| Factor | Simpler | More involved |
|---|---|---|
| Size | One-car garage | Two-car or oversized garage |
| Floor | Dry, level slab needing insulation and flooring | Slab with cracks, a steep slope or moisture |
| Plumbing | No water needed | A bathroom, wet bar or laundry added |
| Heating & cooling | Simple solution for one room | New system or extended ductwork |
| Exterior | Simple window or door in the old opening | Matching siding, trim and roof work |
| Hidden conditions | Sound framing and roof | Rot, water damage or a roof that needs replacing |
Call or text 973-200-1617 or use the free estimate form to set up a visit.
Garage conversions in Rahway, Summit and Paramus
We get garage conversion calls from all over our service area, and three towns come up often:
- Rahway (Union County): a lot of the calls are about attached garages that the family no longer parks in. Those are often good candidates for an office or family room.
- Summit (Union County): homeowners here often ask about converting a detached garage into a studio or home office.
- Paramus (Bergen County): ranch-style and split-level homes with attached garages can sometimes gain a ground-floor bedroom or in-law space without an addition. See also home remodeling in Paramus.
We're also doing garage work in Essex County — see garage conversions in Newark.
What homeowners say about us
★★★★★ 5-star rated on Google
Get a Free Garage Conversion Estimate
Tell us what you'd like the garage to become and send photos of the inside, the door and the roof if you can. We'll set up a free visit and give you a written estimate with the exact price.
Why homeowners call us for garage conversions
- A garage that holds boxes, not cars
- A need for a home office or guest room
- Room for a parent without building an addition
- One contractor for the inside, the siding and the roof
- Hablamos español
Request your free estimate
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Garage Conversion Questions
Do you do garage conversions in New Jersey?
Yes. We convert attached and detached garages into living space for homeowners in Union, Bergen, Passaic, Morris, Essex and Hudson counties, including Rahway, Summit and Paramus.
Are you a garage conversion contractor in Summit, NJ?
Yes, Summit is in our Union County service area. We'll visit the garage, look at the slab, walls and roof, and give you a free written estimate.
Do you convert garages in Paramus?
Yes. Paramus is in our Bergen County service area, and we remodel homes there regularly.
How much does a garage conversion cost?
It depends on the size of the garage, the slab, whether you need plumbing, heating and cooling, and the exterior work. We give a free written estimate with the exact price before any work begins.
Do I need a permit to convert my garage?
Converting a garage to living space is a change to the house. We know local permit requirements for the work we do and will go over them with you; your town's zoning office can confirm any parking or use rules.
Can a converted garage be a bedroom?
Often it can, but a bedroom has stricter requirements, including emergency exit. Tell us early so we design for it.
Can you add a bathroom in a converted garage?
It's possible in many garages, but plumbing changes the scope and price. We'll look at where water and drain lines could run.
What happens to the garage door opening?
We remove the overhead door, frame the opening, usually add a window or door, and finish the outside with siding to match the house.
Will a converted garage be cold?
Not if the floor, walls and ceiling are insulated and the room has proper heating and cooling. That's part of every conversion we plan.
Do you offer financing?
Yes, financing is available for larger projects. Ask when we give you the estimate.
¿Hablan español?
Sí. Hablamos español. Llame o mande texto al 973-200-1617. NJ Lic. #13VH13824700.
Garage conversions and remodeling near you
From our base in Garfield we serve Union, Bergen, Passaic, Morris, Essex and Hudson counties.
Updated November 2026 by the Terra Nova Roofing & Construction team, Garfield, NJ • NJ Lic. #13VH13824700