K&J designs every kitchen, bath, addition, finished basement, and aging-in-place renovation in 3D and prices it with a fixed-scope proposal — so Nassau & Suffolk homeowners always know what they're getting, and what it costs, before demo day.
The contractor who quoted $40K and finished at $68K. The "estimate" that was really a guess. The three weeks that became four months. It's not that homeowners don't trust contractors — it's that a verbal promise and a vague number aren't a plan, they're a risk. So people wait, and keep living with the kitchen they hate for another year.
A drawing and a fixed number aren't a sales tactic. They're what turns "maybe someday" into a start date.
You're not hiring a kitchen guy and a separate crew for the addition and hoping they coordinate. K&J runs every trade on your project through the same estimating system and the same person you can actually reach — backed by two dedicated crews and trade partners we've worked with for years.
Full gut renovations and layout reconfigurations, from cabinet selection through waterfall-edge counters and range venting.
Curbless showers, heated floors, and fixtures we've spec'd down to the tile setter — not a generic "vanity + tub" package.
Rear additions and second-story pop-tops, engineered and permitted before framing starts — square footage that actually adds resale value.
Livable square footage below grade — media rooms, guest suites, or in-law spaces, waterproofed and finished to the same standard as the rest of the house.
Curbless showers, wider doorways, ADA-compliant ramps, and single-level layouts that let clients stay in the home they love, safely.
Condo and co-op unit remodels handled around board approvals, building work-hour rules, and freight-elevator scheduling — without the project stalling on paperwork.
No surprises on change orders, no "we'll figure it out on site." You see the drawing, the number, and the schedule before we touch a wall.
We walk the space with you, take real measurements, and talk through what's actually possible with your layout, budget, and timeline — not a sales pitch, a working session.
Your project is designed in 3D with detailed plans and elevations, so you're approving finishes and layout — before they're framed in your house.
One clear number, built from the actual drawing. If anything changes along the way — an upgrade, a credit, even swapping a paint color — we put it in writing before moving forward, so we're always on the same page.
Our lead carpentry team runs the job daily, backed by the same trusted trade partners on every project, with scheduled walkthroughs so you always know what's next.
Layout, finishes, and fixtures are drawn and confirmed in 3D before a wall opens — not decided on the fly.
Carpentry, electrical, plumbing, and every other trade on your job come from the same team we've worked with for years — they know your house, not just today's punch list.
One fixed price for the job. If anything changes along the way — an upgrade, a credit, even swapping a paint color — we put it in writing before moving forward, so we're always on the same page.
Every project below started the same way every project does — a site visit, a drawing, and a fixed number. Full case studies and photos available on request.
Kitchen opened up to the dining room, with a new sliding door leading out to a newly built patio.
"All this major construction was done expertly by Jason and his workers. They were very helpful and understanding for my needs throughout this job."
— Ruth Hecht, Google Review
Replaced a section of the home's main steel beam with a properly sized LVL flitch plate beam, rebuilt basement stairs and stair walls, and reframed the attic access with a new pull-down ladder.
"Jason and his whole team are very professional and very knowledgeable... will go above and beyond to make sure the job is done right the first time around."
— Devang Shah, Google Review
Fully unfinished basement converted into livable space — drywall, flooring, tile work, and interior paint, now a functioning part of the home.
"K&J did a phenomenal job constructing our basement from entirely unfinished into a livable space that is completely now part of our house."
— Evan Markou, Google Review
Real reviews from Google and Facebook — unedited, from homeowners and one repeat professional referral.
"K & J contracting have been the most amazing people we have ever hired. They helped to create and design our ultimate dream home... There were never any surprises and in these tough times they made everything right."
"Jason and his team did truly great full renovation work with our kitchen, primary bath and guest bath... Jason's a very honest owner from the get-go and did not throw any surprises our way. Would hire again."
"Jason and his crew did an impeccable job. They kept safe with masks, cleaned up, were on time, and kept excellent communication throughout the process."
"As an interior designer, I had the opportunity to work on multiple jobs with Jason and his team and I highly recommend them. Excellent company, reliable, quality work and a great team of people."
"We have used K & J for two large projects over the last ten years. Our experience with them has always been just perfect... They are reliable and trustworthy. I rate them a '10'."
K&J Contracting has grown almost entirely on referrals and repeat clients across Nassau & Suffolk County — not ad spend. That only works if the work holds up and the person who answers the phone is the same person who's been on your job since week one. Twenty years in, we're now doing work for the grown children of our very first clients — the kind of trust that only comes from two decades of showing up.
Every project runs through the same systems: designs drafted in 3D so you see the plan before it's built, and one clear number for the job — any change along the way gets put in writing before we move forward, so we're always on the same page — the same standards we'd want if we were hiring a contractor for our own house.
Every project gets a fixed-scope proposal after the site visit — these are typical ranges so we start the conversation on the same page.
Full gut renovation — layout reconfiguration, new plumbing & electrical, custom cabinetry, full finish package.
A full gut down to the studs — curbless showers, heated floors, fixtures spec'd in detail.
Rear additions and second-story pop-tops, engineered and permitted before framing starts.
Livable square footage below grade — home offices, exercise rooms, saunas, guest rooms with egress windows.
Curbless showers, wider doorways, and single-level layouts that let clients stay in the home they love, safely.
Condo & co-op unit remodels handled around board approvals and building scheduling requirements.
Site visits are typically scheduled within a week of your call. From there, design and a fixed-scope proposal usually take 2–4 weeks depending on project size — full timeline confirmed at your site visit.
Yes. We manage permitting, engineering coordination where required, and inspection scheduling as part of every project — it's built into your proposal, not billed separately mid-job.
Many capital improvement projects in New York qualify for ST-124 exemption treatment. We'll flag whether your scope qualifies during the proposal stage and handle the documentation.
Framing, carpentry, and project oversight run through our own crews. Electrical, plumbing, HVAC, and other specialty trades come from the same licensed partners we've worked with for years — they're as much a part of the team as anyone on our payroll.
Nassau and Suffolk County, Long Island — kitchens, bathrooms, additions, basements, and apartment renovations for homeowners across the island.
Tell us what you're planning and we'll schedule a site visit — no obligation, no pressure, just a real conversation and a real drawing.
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