about us


Firmus LLC was formed in 2012 by Benjamin and Jonathan Waszaj, and Matthew Jennings, We are taking the mantle from our father Demetrio Waszaj, with over 30 years experience in the carpentry trade.

In 30 years of business, Demetrio never advertised his business, and relied solely on his quality, honesty and integrity to gain the trust of his customers to refer him. 30 years later, we are still reaping the benefits of word of mouth referrals.


Benjamin Waszaj grew up in construction and worked for his father for years. He took a 5-year break from the business while joining the LAPD. During that time, he missed the thrill of completing a job and satisfying a customer and returned home to his family in New Jersey. As much as he enjoys the labor, he also enjoys the day to day operations of running a small business. He is married to his lovely wife and adores his kids.


Today, we are located in Central Jersey, we are fully licensed and insured:

NJ Home Improvement Contractors License #13VH06640500

Services include:

-Custom Interior Woodwork
-Crown Molding
-Coffered Ceiling
-Interior trim

Check out our reviews on



Work was started and finished on schedule. Professionals, clean, neat and outstanding work.
— Steven S.
We had a wonderful experience with the guys at Firmus and after completing a major home renovation and dealing with many different sub contractors I can honestly say that my experience with Firmus was the best. They are a solution based team that is honest, hard working and very reliable. I would recommend them to anyone!
— Doug F.
Showed up when he said ,his work exceeded my expectation , cleaned up after his work was done. And I would highly recommend him and would also higher him back myself for any future endeavors.
— Oliver N.
The work that Firmus Contracting have done in my house is absolutely wonderful. I had crown moldings installed throughout my whole house along with various different custom moldings and wainscoting done. The guys at Firmus did an amazing job, they were quick and clean and most importantly finished on time. The price they offered couldn’t be beat, and I’ve done my fair share of shopping around. I highly recommend these guys for all of your trimming needs. Will definitely use them again in the future! Thanks Firmus!
— Arsen U.
What can I say?!? These guys at Firmus are simply the BEST! Had them redo our whole house with crown moldings, base molding, doors/windows casing, coffer ceiling in dining room with mood lighting, built-in book/tv unit and last but not least a wonderrful custom clubhouse with working lights, tv/cable outlet, door and window right under our stairs! My kids LOVE IT!!The craftsmanship of their work speaks for themselves. Always on-time and very trustworthy. They even BBQed for me with their wonderful shortribs. I cant duplicate it so I am going to have to have them come back to do some more work for us.
You cant go wrong with these guys. They are wonderful people and family! Love those guys. They put up with alot of my demands and then some. They have some of my work on their website. Take a look at their portfolio. You will be blown away!
— Leo