Home Additions That Look Like They Were Always There.
Primary suites, family rooms, garages, and second-story additions from a licensed Rhode Island contractor who handles the whole project — design through final walkthrough.
Home Additions across Southern New England.
J-One Construction builds residential additions across Rhode Island, Massachusetts, and Connecticut. Primary suites, family rooms, second-story additions, garages, and mudrooms — we handle framing, roofing, siding tie-ins, and interior finishing so your addition matches the existing home inside and out.
The hard part of an addition isn't the framing — it's the tie-ins. Rooflines, siding transitions, foundation connections, and interior finishes all have to blend. We plan those details up front and execute them so nothing looks bolted on.
We coordinate permits, structural review, electrical, plumbing, and HVAC as part of the project so you have one accountable contractor instead of a stack of subs to chase.
Related services
What we handle on home additions projects.
Why homeowners choose J-One Construction.
Owner-run, locally accountable, and organized enough to keep projects on schedule without cutting corners on the finish.
- Clear communication start to finishYou'll know what's happening, when, and why — every step.
- Detailed written estimatesScope, materials, and price in writing before we start.
- Reliable schedulingRealistic timelines you can plan around.
- Clean, respectful job sitesDaily cleanup and property protection are standard.
- Quality materialsProducts we'd install in our own homes.
- Professional crewsExperienced tradesmen, not day labor.
- Local accountabilityOwner-run out of Rhode Island. We're not going anywhere.
- Final walkthrough before completionNothing gets called done until you sign off.
How your home additions project comes together.
Quick call to understand what you're planning.
On-site walk-through with photos and measurements.
Written scope, materials, and pricing.
Choose finishes and lock in the plan.
Confirmed start date and project schedule.
Our crew executes the plan.
You review every detail before we call it done.
Finishes and upgrades we recommend.
Every project is different. During the estimate we walk through the material options that best fit your budget, timeline, and how you'll use the space.
- Full framing packages
- Roofing tie-ins to existing roofline
- Exterior siding to match existing home
- New windows and exterior doors
- Interior finish selections (flooring, trim, paint)
- Electrical rough and finish coordination
- Plumbing rough and finish coordination
- HVAC extension and permit/inspection support
The house no longer fits the way your family lives — you need another bedroom, a real primary suite, or a functional family room, but you don't want to move.
Add functional square footage that matches the existing home in style and quality, without leaving the neighborhood you already like.
Not sure if it's time?
If one or more of these sounds familiar, it's worth a free on-site consultation.
- You've outgrown the current layout
- Family needs have changed since you bought
- You need an extra bedroom or living area
- You want to expand instead of moving
- Existing floor plan feels chopped up
- Garage or second-story expansion is possible
- Property has room for a rear or side addition
Straight talk on cost.
Every project is priced individually. These are the biggest factors that move the number up or down.
Serving Southern New England's most prestigious communities.
Rhode Island
Warwick Neck
Waterfront Peninsula Homes
East Greenwich
Colonial Renovations
South Kingstown
Coastal Farmhouses
Narragansett
Oceanfront Estates
Newport
Coastal Estates
Jamestown
Island Retreats
Westerly
Watch Hill Beach Homes
Providence East Side
Historic Restorations
Massachusetts
Cape Cod
Shingle-Style Cape Homes
Newton
Victorian Restorations
Connecticut
Groton
Thames River Waterfront
Mystic
Historic Village Homes
Stonington
Coastal Borough Estates
Have a project in our service area?
Tell us what you're planning and we'll let you know if your project is a good fit for our schedule.
Questions about home additions?
Plan your addition with a contractor who handles the whole build.
Tell us about your home additions project and we'll follow up within one business day to schedule your free on-site consultation.
- (888) 401-5136
- Rhode Island · Massachusetts · Connecticut