Basement Remodeling and Finishing Contractor in Westfield, NJ
SEI Construction, Inc. is Westfield's most experienced local basement remodeling and finishing contractor.
Based at 110 Myrtle Avenue, we have been transforming Westfield basements since 1987. Fully licensed, 5-star rated, and free consultations available.
Your neighborhood basement remodeling contractor in Westfield, NJ
SEI Construction, Inc. is headquartered at 110 Myrtle Avenue in Westfield and has been serving homeowners throughout Union County since 1987. We are not a regional contractor dispatching crews from another county. We live and work here, and we have finished and remodeled basements in virtually every Westfield neighborhood including Wychwood, the Gardens District, East Broad Street corridors, and the historic sections near downtown.
Westfield’s housing stock is dominated by older Colonial, Cape Cod, Tudor, and Dutch Colonial homes, many with original full basements that have remained unfinished or unchanged for decades. We know these basements intimately: their typical ceiling heights, common moisture patterns, original mechanical layouts, and what the Westfield Township Building Department requires for permits and inspections. That deep local familiarity means fewer surprises and smoother project delivery on every job.
Our basement remodeling and finishing services encompass every scope, from converting a raw unfinished basement into a fully permitted living space to renovating an existing lower level with new layout, finishes, and custom features. Every project is managed by a dedicated project manager from design through final inspection.
Based at 110 Myrtle Ave, Westfield
Not a remote contractor serving your area from a distance
Deep knowledge of Westfield home styles
Colonials, Cape Cods, Tudors, Dutch Colonials, and split-levels
Westfield Township permitting handled for you
We manage all permits, plan submissions, and inspections
Remodeling Big50 Award Winner
One of the top 50 remodeling contractors in the United States
Basement finishing and remodeling services for Westfield homeowners
Every project type, every home style, fully permitted and managed from start to finish.
Full basement renovation and finishing
We transform your unfinished Westfield basement into a fully finished living space. Our team handles all framing, insulation, drywall, electrical, HVAC, plumbing, and finishes under one managed project.
Basement Guest Suite & Accessory Dwelling Unit (ADU)
A private, comfortable space for visiting family, friends or tenants. We design complete lower-level guest suites that can include a bedroom, bathroom, kitchenette, and sitting area built to the same standard as the rest of your home.
Basement bar and entertainment area
A custom entertainment space built for hosting family and friends. We design and build basement bars with integrated shelving, custom cabinetry, and thoughtfully planned layouts that make entertaining feel effortless.
Basement Home Theater
The lower level’s natural isolation from outside noise and light makes it ideal for a custom home theater. We create tailored layouts with integrated audio and visual systems, acoustic planning, and specialty lighting.
Basement Home Office
A quiet, professional workspace designed for daily productivity. We build custom layouts with built-in desks, shelving, and dedicated electrical setups that create a real separation between work and home life.
Basement Home Gym Or Playroom
Whether it is a dedicated fitness space with specialized flooring and ventilation or a safe, durable playroom for young children, we design lower-level spaces built for how your family actually lives.
Our Basement Remodeling Project Gallery
Explore some of our recent basement remodeling and finishing projects completed for homeowners in Westfield, NJ and surrounding Union County communities.
We know Westfield's home styles and what their basements need
Westfield’s residential neighborhoods are defined by home styles built predominantly between the 1920s and 1970s. Each architectural type carries specific basement characteristics that must be accounted for before any finishing or remodeling work begins. Generic contractors miss this. We do not.
Cape Cod Homes
Typically full basements with lower ceiling heights. Smart layout planning maximizes livable space and egress compliance in tighter lower-level footprints.
Colonial Homes
Westfield’s most prevalent style. Full basements with solid bones but frequently original moisture barriers, older mechanical systems, and low-clearance areas around ductwork that require careful planning to maximize finished ceiling height.
Tudor Homes
Character-rich homes with deep basements well-suited for entertainment spaces. Structural and waterproofing considerations are key before finishing begins.
Dutch Colonial Homes
Generous basement footprints that lend themselves well to multi-purpose finished spaces. Guest suites, home offices, and combined living areas are common project types for this home style.
Victorian and Historic Homes
Older homes require special assessment of foundation walls, moisture management, and structural conditions before any finishing begins. Our experience with historic Westfield properties means no surprises mid-project.
Split-Level Homes
Lower levels in Westfield split-levels are partially below grade and require careful attention to natural light strategy, egress compliance, and ceiling height to achieve a comfortable finished result.
Everything included in a Westfield basement remodel by SEI
Unlike contractors who subcontract major portions of the work to crews they do not manage directly, SEI Construction oversees every trade and every phase of your project in-house. You get one team, one project manager, and one point of contact from the day you sign to the day we walk through the finished space together.
All basement finishing and remodeling projects in Westfield require permits. We handle the full permit application, plan review, and inspection scheduling with the Westfield Township Building Department so you never have to navigate that process yourself.
Custom basement design and layout planning
Tailored to your basement’s actual dimensions and your household’s needs
Westfield Township permitting and inspections
We handle all permit applications, plan submissions, and inspection scheduling
Basement Framing, insulation, and drywall
Full structural buildout with moisture-resistant materials appropriate for below-grade spaces
Basement Electrical, lighting, and smart home wiring
Dedicated circuits, recessed lighting, and outlet placement optimized for intended use
Basement Plumbing for bathrooms, wet bars, and kitchenettes
Full rough-in and finish plumbing for any water features your project requires
Basement Egress window installation and safety compliance
Required for any basement bedroom or guest suite per NJ residential code
Rated 5 stars by Westfield and Union County homeowners
Posted on Jackie MetzgerTrustindex verifies that the original source of the review is Google. This was the third project and the most extensive project that we hired SEI for. We felt very comfortable working with all his crew, they were easy to communicate with and always kept us up to date on the progress. I especially like Mike's detailed estimates. They are easy to read and you know exactly what he is going to do and when he needs payment for each step. You can depend on Mike to check in on the progress at each stage and if you have any issues he addresses them immediately and to your satisfaction. The quality of their work is terrific and the job is not complete until the last detail has been addressed and the final inspection is in your hands and everyone is happy with the result.Posted on Noreen CroteauTrustindex verifies that the original source of the review is Google. We had SEI Construction do a lot of renovations on our home. Mike and his crew especially Izzy, worked as if it was their home. From the estimate and meeting with Mike to explain our vision, EVERYTHING was done as promised if not better then we expected! Plus they work clean!!! Experts in their craft!! I cannot rave enough!Posted on Jessica FriedmanTrustindex verifies that the original source of the review is Google. I'm an interior designer in the area. I've used Mike and his team on countless projects over the past 10 years. We just completed another a few weeks ago. His team is always wonderful, trustworthy and meticulous. I throughly enjoy working with them and look forward to future projects. I can't believe I haven't written a review sooner!Posted on edward shannonTrustindex verifies that the original source of the review is Google. Posted on Victor CenciTrustindex verifies that the original source of the review is Google. 2 years ago, SEI redid our outside deck, remodeled a downstairs bathroom and installed composite railing in the front of our house. The team was professional, courteous and responsive, and the fit / finish was excellent. Just this month, I called them back to replace a broken cap on the composite railing (winter weather casualty) and to screw down some deck boards that were in danger of coming up. The team came back and did the work at no charge and found more missing / broken screws than I did. Very pleased with their response and happy to recommend a local, quality contractor.Posted on Aaron BakerTrustindex verifies that the original source of the review is Google. SEI construction added a net-new master suite, remodeled 1 full bath, created a net-new full bath in the basement, and redid all HVAC duct work, roofing, and siding. Our contractor selection criteria was quality and project management. We needed good communication and a central point of contact for questions, and SEI checked those boxes at a very reasonable price. The owner Mike Rizzo was a great communicator and very relatable. He always made technical topics Easy to understand. He’s got young kids and was great to our kids. Always patient and accommodating. Our project lead was Tyler. He was friendly, funny, and an expert carpenter. There was quality and precision in everything he built. He was really nice to my 6 and 8 daughters every day and even got my youngest a birthday present. So thoughtful! He also let me bang a few nails so I felt part of the build process. I’m thrilled with the work they did. Very content with the price we paid, and so grateful for their attention to every detail, which makes all the difference in the world. I would recommend SEI to anyone looking to remodel or add new space.Posted on Laura KastTrustindex verifies that the original source of the review is Google. SEI is the best! Smart, thoughtful, fast and great quality work! We've used other contractors before and SEI is far and away better than anyone else we've worked with. Great attention to detail. I can't recommend them enough!Posted on Jeff ThompsonTrustindex verifies that the original source of the review is Google. We hired SEI through a friends referral for a bathroom remodel. They are our number one recommendation for a few reasons: 1) attention to detail, 2) friendliness and trust of crew, and 3) responsiveness. They truly want the end result to be great and you can always trust who they will bring in your home. After our initial bathroom remodel, they did our deck, and are going to help on a commercial venture. I can't recommend them enough.Posted on Linda HTrustindex verifies that the original source of the review is Google. We cannot recommend SEI Construction more highly. As serial renovators, my husband and I have worked with many contractors and the quality of craft, attention to detail, pace, and the absolutely delightful team of employees that SEI offers is unmatched. SEI is professional and qualified in every sense of the word and we cannot be more pleased with our final results!Posted on Mike RileyTrustindex verifies that the original source of the review is Google. We hired Mike and his team to put on an addition to our home in Clark. Although we had a smaller budget than most of Mike’s clients, Mike worked within our budget and showed he cared the same for us as the rest of his clients. Our situation was unique because my wife was 9 months pregnant when the work started. The day our daughter was born was the day the kitchen was demoed. Mike and his team did a great job doing whatever they could so the work would not affect our baby or our 4 year old son. They worked hard to keep the rest of the house clean and dust free. As in any project, there were situations that came up that had to be dealt with. Mike worked with us to come to the best resolutions possible. We highly appreciate Mike and Tyler’s craftsmanship, professionalism, trustworthiness, but most importantly their respect for our family. We would like to thank Mike, Tyler, Rudy, Oscar, Izzi, and Nick for doing great work and for caring about our family. Our home is now complete. Mike and Nicole Riley
Westfield, NJ basement remodeling FAQs
Questions specific to finishing and remodeling basements in Westfield, NJ.
Do I need a permit to finish my basement in Westfield, NJ?
Yes. The Township of Westfield requires permits for basement finishing and remodeling projects that involve framing, electrical work, plumbing installations, HVAC modifications, or egress window additions. Westfield’s Building Department reviews plans and conducts inspections at multiple stages of the project.
SEI Construction, Inc. manages the full permitting process on your behalf, including plan preparation, permit application submission, and coordinating all required inspections with Westfield Township, so you never have to interact with the building department yourself.
How long does a basement remodel take in Westfield, NJ?
A straightforward basement finishing project in Westfield typically takes six to ten weeks once permits are approved.
More complex projects involving custom guest suites with bathrooms, home theaters with acoustic treatment, or multi-room layouts can run twelve to sixteen weeks. Permit approval timelines in Westfield Township vary by project complexity. We provide a detailed, phase-by-phase timeline during your free consultation.
How much does it cost to finish a basement in Westfield, NJ?
Basement finishing costs in Westfield depend on square footage, ceiling height, scope of work, and whether the project includes specialty spaces like bathrooms, bars, home theaters, or custom built-ins.
Westfield’s older home stock occasionally presents moisture, structural, or mechanical conditions that require addressing before finishing work begins, which can affect final cost.
We provide detailed, itemized written proposals after walking your basement during the free consultation. There are no ballpark estimates and no surprises after signing.
What basement ceiling height is required in Westfield, NJ?
New Jersey residential code requires a minimum finished ceiling height of 7 feet for habitable basement spaces, with allowances for beams, ducts, and mechanical obstructions.
Many Westfield Colonials and Cape Cods have basement ceiling heights in the 7 to 8 foot range, which is workable with careful planning. We assess your actual ceiling height during the free consultation and design the finished layout to maximize the usable height throughout the space.
Can you add a bathroom to my Westfield basement?
Yes. Adding a bathroom is one of the most common requests we handle in Westfield basement projects. It requires careful planning around plumbing rough-in location, drainage options, and Westfield Township permit requirements for new bathroom additions.
In some older Westfield homes, adding a basement bathroom requires a sewage ejector pump depending on the existing drainage configuration. Our team assesses all of this during the initial consultation and incorporates it into the proposal.
Does finishing my basement require an egress window in Westfield?
Yes, if the finished basement will include a bedroom or sleeping area.
New Jersey residential code requires egress windows that meet minimum size requirements for any room designated as a bedroom to ensure occupants can safely exit in an emergency. SEI handles egress window installation as part of the basement project scope and ensures all openings meet both NJ code and Westfield Township requirements.
Why hire a local Westfield contractor instead of a regional NJ company?
SEI Construction, Inc. is based in Westfield and has completed projects in virtually every neighborhood in town over nearly four decades.
We have direct experience with the Westfield Township building department, deep familiarity with the specific basement characteristics of Westfield’s most common home styles, and a local reputation built entirely on work done right here in your community.
Regional contractors serving all of NJ lack the township-specific knowledge, local building department relationships, and neighborhood familiarity that make projects run more smoothly and finish more precisely.
Also serving nearby Union County townships
Basement remodeling contractors near Westfield, NJ
If you are near Westfield, we serve your community too. SEI Construction covers all of Union, Essex, and Morris County.
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Meet Us
110 Myrtle Avenue, Westfield, NJ 07090
Call Us
+1 (908) 789-9151
Business Hours
Monday – Friday 8:00AM – 4:30 PM





