Union County · Based in Warren, NJ — serving North New Jersey and surrounding counties
Custom carpentry & interior remodeling in Mountainside, NJ
Mountainside's wooded lots and residential streets sit between Westfield and Springfield — homes that often need interior craftsmanship that matches the quiet, established feel outside. ONYX delivers custom carpentry and remodeling with owner-led attention.
Carpentry & remodeling in Mountainside, NJ
Mountainside interiors frequently pair generous windows with builder-era trim and bathrooms that never got a second life. ONYX focuses on upgrades that respect the home's shell — better millwork, smarter storage, and baths finished to a standard you will still like in ten years.
Projects here range from powder rooms and laundry carpentry to primary bath gut renovations and living-room built-ins. Every job follows Design–Finish so planning, build, and finish stay sequenced under one craftsman.
From Warren, Mountainside is a practical service radius. Rhett Mattson stays involved on site, which matters when details like casing returns and vanity proportions need real-time decisions.
Mountainside home styles
Mountainside homes on wooded lots often pair strong exterior character with interiors ready for refined trim, built-in storage, and bathroom modernization.
Popular projects in Mountainside
- Living-room & den built-in cabinetry
- Primary & powder bathroom remodels
- Laundry room cabinetry & countertops carpentry
- Window trim & casing upgrades
- Basement recreation-room millwork
What we build in Mountainside
Two core disciplines — custom carpentry and interior remodeling — delivered through our Design–Finish process.
Our signature execution framework
Every carpentry and remodeling project follows the same three-phase system—Design, Execution, and Finish—for consistent quality from consultation to handover.
Design
Layout planning, system selection, and mapping how you use the space every day.
Execution
Precise, high-quality craftsmanship, carpentry, and construction—built to plan.
Finish
Final aesthetic details, fit, drywall, and painting for a seamless, intentional handover.
Includes drywall, painting, and final aesthetic detailing.
Mountainside, NJ — frequently asked questions
- Does ONYX serve Mountainside, NJ?
- Yes. ONYX Home Solutions serves Mountainside and neighboring Union County towns including Westfield, Springfield, and Scotch Plains from Warren, NJ.
- What makes ONYX different from a big remodeling company in Mountainside?
- ONYX is owner-operated. Rhett Mattson is Owner & Lead Craftsman on every project — you work directly with the person building your carpentry and remodeling work.
- How do I get a Mountainside estimate?
- Request a free consultation at onyxhs.com/contact or call (908) 242-6009. ONYX schedules an on-site visit and scopes from what we see in your home.
Nearby service areas
Also serving communities near Mountainside
Ready to start your Mountainside project?
Request a free on-site consultation. Rhett will visit your Mountainside home, discuss your goals, and help you scope the right path — carpentry, remodeling, or both.
13+
Years of Experience
150+
Successful Projects Completed
5.0
Average Google Rating
100%
Customer Satisfaction Rate