You’re running out of room. Maybe it’s a kid who needs their own space, aging parents moving in, or you just need a home office that actually has a door. Moving costs a fortune right now, and your lot size won’t let you build out.
That’s where a dormer makes sense. It uses the attic space you already have—the area that’s too dark and cramped to be useful—and turns it into a real room with headroom, light, and function.
You get a bedroom with an attached bathroom. A quiet office away from the kitchen noise. A walk-in closet that doesn’t eat into your existing square footage. Whatever you need, a dormer addition delivers it without touching your backyard or dealing with the nightmare of selling and buying in this market.
And it’s not just about the space. A well-built dormer can increase your home’s value by thousands while solving the problem that’s been stressing you out for months.
We’ve been handling dormer projects across Long Island for over 40 years. We’ve worked through every zoning quirk Nassau County can throw at a project, and we know how to build dormers that pass inspection the first time.
You won’t get voicemail when you call. You won’t wait three days for a text back. And if something goes wrong—frozen pipes, storm damage, anything—we respond. That’s not marketing talk. It’s how we’ve stayed in business this long in one of the most competitive markets in New York.
We’re licensed and insured across Nassau and Suffolk counties. Our crews keep job sites clean, show up when they say they will, and treat your home like it’s our own. If you’re in Carle Place or anywhere nearby, you’ve probably seen our work.
First, we come out and look at your attic. Not every roof can handle a dormer, and not every attic layout makes sense for one. We’ll tell you what’s possible, what it’ll cost, and how long it’ll take. No runaround.
Once you’re ready to move forward, we handle the design and pull any permits needed. Then we open up the roof, frame the dormer structure, and tie it into your existing roofline. Roofing, siding, windows—it all gets done to match your home’s exterior.
Inside, we frame the walls, run electrical and plumbing if you’re adding a bathroom, insulate, and finish with drywall and flooring. Most dormer projects wrap up in a few weeks, depending on size and scope.
You’ll know what’s happening at every step. We walk you through inspections, timelines, and any adjustments. No surprises, no disappearing for days at a time. Just steady progress until the space is ready to use.
Ready to get started?
A dormer isn’t just a bump-out on your roof. It’s a full room addition that includes structural framing, roofing, siding, windows, insulation, electrical, and interior finishes. If you’re adding a bathroom, that means plumbing, fixtures, and ventilation too.
In Carle Place and across Nassau County, most dormer projects are either shed dormers or gable dormers. Shed dormers have a single sloping roof and give you the most usable interior space—great for bedrooms or offices. Gable dormers have that classic triangle shape with a pitched roof and work well for adding light and character without maxing out square footage.
Here’s what matters locally: Long Island has strict zoning rules, and your lot size often won’t allow you to expand outward. Dormers let you add space vertically, working within those restrictions. Materials and labor costs run higher here than most of the state, so a 250-square-foot dormer typically falls between $20,000 and $50,000 depending on complexity and finishes.
But compare that to moving. With median home prices in Nassau County pushing past $640,000 and mortgage rates over 7%, adding a dormer is the smarter financial move if you like where you live and just need more room.
Most dormer projects in Nassau County run between $20,000 and $50,000, depending on size and what you’re building. A basic shed dormer that adds a bedroom will cost less than a gable dormer with a full bathroom and custom finishes.
Long Island pricing sits at the higher end because materials and labor cost more here than in most of New York. You’re looking at around $188 to $194 per square foot when you factor in everything—framing, roofing, siding, windows, insulation, electrical, and interior work.
The good news: a dormer addition typically returns 40% to 50% of the cost in home value. So a $30,000 project could add $12,000 to $15,000 to your home’s worth. And that’s before you factor in the value of actually having the space you need without moving.
It depends on your roof structure and attic space. Most homes can support a dormer, but there are exceptions—especially if your roof framing is unusual or your attic has very low clearance.
We’ll come out and evaluate your specific situation before giving you a firm answer. We’re looking at roof pitch, rafter spacing, how the dormer will tie into your existing structure, and whether your attic layout makes sense for the type of room you want to add.
If a dormer won’t work, we’ll tell you up front. But in most cases, there’s a way to make it happen. We’ve been doing this for 40 years across every type of home Long Island has to offer, so we’ve seen just about every scenario.
Most dormer projects take three to six weeks, depending on size and complexity. A straightforward shed dormer that adds a bedroom might be done in three weeks. A larger project with a bathroom, custom windows, and high-end finishes will take closer to six.
Weather can slow things down, especially during winter. And if there are permit delays or inspection reschedules, that adds time too. But we keep you in the loop throughout the process so you’re never wondering what’s happening.
The roof is only open for a short window—usually just a few days—so you don’t have to worry about living in a construction zone for weeks on end. We work efficiently, keep the site clean, and make sure the project stays on track.
Yes. Any structural work that involves opening up your roof and adding square footage requires permits in Nassau County. The permitting process covers building, electrical, and plumbing if you’re adding a bathroom.
We handle the permit applications and make sure everything meets local building codes. Nassau County has specific requirements around setbacks, height restrictions, and structural standards, and we know how to navigate them.
Inspections happen at different stages—framing, electrical, plumbing, and final. We schedule those and make sure the work passes the first time. You don’t have to deal with the county or chase down inspectors. That’s on us.
Absolutely. Adding a bathroom is one of the most common reasons people build dormers in the first place. It’s a smart move if you’re turning attic space into a primary suite or adding a bedroom for aging parents who need their own facilities.
We’ll run plumbing lines up from your existing system, install fixtures, add ventilation, and finish it out with tile, vanity, and whatever else you want. It’s all part of the same project, so you’re not coordinating multiple contractors.
Keep in mind that adding a bathroom does increase the cost and timeline. Plumbing work requires its own permits and inspections, and there’s more coordination involved. But the payoff is huge—both in terms of functionality and home value. A bedroom with an attached bathroom is worth a lot more than a bedroom that shares a hall bath.
A shed dormer has a single sloping roof that extends out from your existing roofline. It gives you the most interior space and headroom, which is why it’s the go-to choice for bedrooms, offices, and bathrooms. The roofline is simple and the construction is straightforward.
A gable dormer has a peaked, triangular roof that projects out from the main roof. It adds architectural character and works well if you want to bring in more light without adding as much square footage. Gable dormers are great for creating cozy reading nooks or adding windows to brighten up an attic space.
Which one makes sense for your home depends on what you’re trying to accomplish and what your existing roof structure allows. We’ll walk you through both options during the consultation and show you what’ll work best for your layout and budget.
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