Updated May 2026
Basement Apartment / In-Law Suite · Mountainside, NJ
Convert an underused basement into a safe, code-compliant apartment or in-law suite. We handle interior framing, egress, kitchens, baths and finishes in Mountainside, NJ.
We remodel basements into self-contained apartments or in-law suites that meet local code and daily living needs. Services include layout planning, structural openings, insulation and drywall, electrical and lighting upgrades, heater routing (as part of interior conversion), kitchen buildouts, full bathrooms, flooring, doors, trim and interior paint.
Our work
FAQ
Costs vary by scope, egress needs, bathroom and kitchen complexity, and finish level. Typical interior-only conversions in Union County start with a baseline estimate after a site visit. Request a walkthrough for a written estimate tailored to your basement.
Most projects run 8–14 weeks from permit approval for standard finishes. Projects needing structural work or complex mechanical rerouting can take longer. We provide a projected timeline with the estimate.
You can usually remain in the home, but expect intermittent noise, dust, and restricted access near the work area. We set containment, daily cleanup procedures, and a schedule to limit disruption.
Schedule a consultation and on-site walkthrough. We review your basement, confirm egress and mechanical options, then deliver a written estimate and permit checklist so you can decide how to proceed.
Real basement apartment / in-law suite projects in New Jersey homes — same room, before we started and after we finished. Move the handle.
Drag the handleSwipe the handle or use ←→ to compare before and after.
Edison basement recreation room with game zones
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Reviews
“I highly recommend Home Concept Construction. This was truly the best construction company I’ve ever worked with in my lifetime. Their team was professional, reliable, and incredibly efficient from start to finish. They are men of their word—honest, hardworking, and committed to delivering quality results. Whether i…”
monique venable
6 months ago
“Oscar and his team are expert craftsmen. Our kitchen renovation is so beautiful the house looks like a new build. They came when said they would and returned all calls promptly. I highly recommend Home Concepts construction and will be using them again for other projects.”
Donna G
a year ago
“Oscar and his team are second to none. Their work is of high quality, with precision. The team renovated our kitchen and family room, installed engineered hardwood floors throughout our home, painted plus some. They are extremely professional, flexible and accommodating. Oscar is a creative thinker and designed g…”
Audrey Sudran
a year ago
Verified reviews from Home Concepts Construction’s Google Business Profile. Read all reviews on Google →
Schedule
Pick a day and time that works for you. We come to your Mountainside home, walk the space, take measurements, and put a written scope together on-site. About 45-60 minutes.
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Mountainside, NJ
Free in-home walkthrough. Written scope before you commit. One team from demolition to final inspection.
Get a free quote
Tell us a little about the project and we'll get back within one business day with real answers about how it would go in a Mountainside home.
Free in-home visit
We come to you. Measure, plan, and quote on-site.
Licensed in NJ
NJ HIC #13VH10078600
Real response
Within one business day.
See more from Basement Apartment / In-Law Suite or learn about remodeling in Mountainside, NJ.
Nearby towns
Same crew, same standards one town over. Tap to see how the project would go there.
Ready to start?
No pressure, no obligation. We’ll walk through what’s worth doing first, what can wait, and what to watch out for — before anyone talks contracts.
