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Find Basement remodelers in Mahwah

"Very efficient! Quality work. Highly recommend!"

Eleanor C on October 2025

Hello, We pride ourselves on the quality of craftsmanship, we put into every project. The company provides full renovations of residential housing exterior and interior.

"Very efficient! Quality work. Highly recommend!"

Eleanor C on October 2025


B&J General Contracting, LLC

5.00(
1
)
Approved Pro

B&J General Contracting, LLC

5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
4 years of experience

B&J General Contracting LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"Brandon installed a new bathroom for me and it came out great!"

Kathy B on August 2024

B&J General Contracting LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"Brandon installed a new bathroom for me and it came out great!"

Kathy B on August 2024


Avatar for International Construction & Service

International Construction & Service

4.98(
23
)
Approved Pro

International Construction & Service

4.98(
23
)
Approved Pro
Customers say: Quick response
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
10 years of experience

International Construction & Service, is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and responsibility in all of our jobs. We are a locally owned and operated business with more than 15years of experience serving Clifton and surrounding areas. There is no job too big, or too small for our team. Call today and let us put our experience to work for you!

"They did a phenomenal job on our two ceilings in this 1890’s home. They showed up on time, were responsive to our questions, worked diligently, completed in time, did a professional job, and the results are beautiful. Their price was reasonable too. I strongly recommend them. "

Ruth M on October 2025

International Construction & Service, is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and responsibility in all of our jobs. We are a locally owned and operated business with more than 15years of experience serving Clifton and surrounding areas. There is no job too big, or too small for our team. Call today and let us put our experience to work for you!

"They did a phenomenal job on our two ceilings in this 1890’s home. They showed up on time, were responsive to our questions, worked diligently, completed in time, did a professional job, and the results are beautiful. Their price was reasonable too. I strongly recommend them. "

Ruth M on October 2025


Avatar for Platinum Solutions, LLC

Platinum Solutions, LLC

5.00(
4
)
Approved Pro

Platinum Solutions, LLC

5.00(
4
)
Approved Pro
Customers say: Quick response
4 years of experience
Free onsite estimate

Platinum Solutions LLC is a construction company based in Bergen County NJ that works with Property Management Groups, Interior Designers, and Homeowners. We strive to provide phenomenal service that is rare, but simple which includes fast completion times as well as outstanding quality. We discover new, strategic ways to raise the bar and standards of basic construction and Property Maintenance here in New jersey. We deliver on time and on budget project services.

"Michael is very reliable and he's done several projects for me. Flooring, wood work, tiling. He communicates very well and he's punctual. He's very knowledgeable and honest about his pricing. I look forward to working with him, again."

Roger . on February 2023

Platinum Solutions LLC is a construction company based in Bergen County NJ that works with Property Management Groups, Interior Designers, and Homeowners. We strive to provide phenomenal service that is rare, but simple which includes fast completion times as well as outstanding quality. We discover new, strategic ways to raise the bar and standards of basic construction and Property Maintenance here in New jersey. We deliver on time and on budget project services.

"Michael is very reliable and he's done several projects for me. Flooring, wood work, tiling. He communicates very well and he's punctual. He's very knowledgeable and honest about his pricing. I look forward to working with him, again."

Roger . on February 2023


Avatar for Built To Last Home Improvements, LLC

Built To Last Home Improvements, LLC

4.77(
24
)
Approved Pro

Built To Last Home Improvements, LLC

4.77(
24
)
Approved Pro
Customers say: Quick response
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
7 years of experience

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction!

"I gave this man $3000 which was 33% of the job upfront. Was supposed to give him 33% at the halfway part And 34% upon completion. But when I went to my bathroom and realized you left drugs in my bathroom and I have small children. Not like that 3000 black and small cleaners caught easy and heâ s lucky he hasnâ t been charged with nothing. Only reason that happened is because I wouldnâ t pursue charges. He obviously is a drug addict and has a problem so maybe he should get help Possibly isnâ t the option maybe rehab is. If you paid for supplies, you got ripped off wait 10 years and it will all fall apart charges for certain stuff but buys different stuff so he can use the extra money to pick himself up drugs without nobody noticing, I am so terribly in grief over this. $3000 he ran off with how is Matt doing in business and not in a jail cell"

Daniel B on July 2024

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction!

"I gave this man $3000 which was 33% of the job upfront. Was supposed to give him 33% at the halfway part And 34% upon completion. But when I went to my bathroom and realized you left drugs in my bathroom and I have small children. Not like that 3000 black and small cleaners caught easy and heâ s lucky he hasnâ t been charged with nothing. Only reason that happened is because I wouldnâ t pursue charges. He obviously is a drug addict and has a problem so maybe he should get help Possibly isnâ t the option maybe rehab is. If you paid for supplies, you got ripped off wait 10 years and it will all fall apart charges for certain stuff but buys different stuff so he can use the extra money to pick himself up drugs without nobody noticing, I am so terribly in grief over this. $3000 he ran off with how is Matt doing in business and not in a jail cell"

Daniel B on July 2024


Avatar for Goble General Contracting, LLC

Goble General Contracting, LLC

New on HomeAdvisorNew on HomeAdvisor
Approved Pro

Goble General Contracting, LLC

New on HomeAdvisorNew on HomeAdvisor
Approved Pro
10 years of experience
Free onsite estimate

At Goble General Contracting, LLC, we are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships and guarantee your satisfaction! Contact us today and see why we come so highly recommended!

At Goble General Contracting, LLC, we are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships and guarantee your satisfaction! Contact us today and see why we come so highly recommended!


Avatar for On The Spot Home Improvements, Inc

On The Spot Home Improvements, Inc

4.25(
6
)
Approved Pro

On The Spot Home Improvements, Inc

4.25(
6
)
Approved Pro
Customers say: Quality work
26 years of experience

Founded in 1987, On The Spot Home Improvements became one of New Jersey’s leading home improvement companies, building a reputation of excellence and customer satisfaction. Based in Saddle Brook since 2006, we pride ourselves on meeting the needs of every client we serve. Our mission is to provide comprehensive home improvement solutions from small repairs to full-scale renovations and additions. Our team ensures every project receives meticulous attention to detail, quality craftsmanship, and timely completion. And our suite of kitchen and bathroom remodeling, roofing, siding, and masonry services cater to our customers’ home improvement challenges.

"From start to finish the experience was exceptional. The team was professional and knowledgeable. The awning fabric itself is amazing. I have received numerous compliments from my neighbors. I highly recommend On The Spot for anyone looking to enhance their home."

Richard F on October 2024

Founded in 1987, On The Spot Home Improvements became one of New Jersey’s leading home improvement companies, building a reputation of excellence and customer satisfaction. Based in Saddle Brook since 2006, we pride ourselves on meeting the needs of every client we serve. Our mission is to provide comprehensive home improvement solutions from small repairs to full-scale renovations and additions. Our team ensures every project receives meticulous attention to detail, quality craftsmanship, and timely completion. And our suite of kitchen and bathroom remodeling, roofing, siding, and masonry services cater to our customers’ home improvement challenges.

"From start to finish the experience was exceptional. The team was professional and knowledgeable. The awning fabric itself is amazing. I have received numerous compliments from my neighbors. I highly recommend On The Spot for anyone looking to enhance their home."

Richard F on October 2024


Rockledge Remodeling NJ, LLC

New on HomeAdvisorNew on HomeAdvisor
Approved Pro

Rockledge Remodeling NJ, LLC

New on HomeAdvisorNew on HomeAdvisor
Approved Pro
93 local quotes requested
Free onsite estimate

We specialize in all phases of remodeling for your home, business, bathrooms, kitchens, finishing basements, and more! We offer a diverse range of services tailored to meet the unique needs of every customer. We take a personalized approach to each project. We work closely with our clients to understand their vision, preferences, and budgetary requirements. We strive to exceed expectations by delivering exceptional service, great quality work, and professionalism on every job. Read more below on all the services we offer and contact us with any questions or to schedule a free estimate today!

We specialize in all phases of remodeling for your home, business, bathrooms, kitchens, finishing basements, and more! We offer a diverse range of services tailored to meet the unique needs of every customer. We take a personalized approach to each project. We work closely with our clients to understand their vision, preferences, and budgetary requirements. We strive to exceed expectations by delivering exceptional service, great quality work, and professionalism on every job. Read more below on all the services we offer and contact us with any questions or to schedule a free estimate today!


Avatar for SB General Construction, LLC

SB General Construction, LLC

4.67(
3
)
Approved Pro

SB General Construction, LLC

4.67(
3
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
56 local quotes requested

We understand the importance of innovation and professionalism. We guarantee your satisfaction and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our services offered and call or click to schedule an estimate today.

"They were great. Made all needed repairs and some nice upgrades to our deck. Quality work for a fair price."

Kevin C on June 2024

We understand the importance of innovation and professionalism. We guarantee your satisfaction and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our services offered and call or click to schedule an estimate today.

"They were great. Made all needed repairs and some nice upgrades to our deck. Quality work for a fair price."

Kevin C on June 2024


Avatar for RWS Homes, LLC

RWS Homes, LLC

4.69(
38
)
Approved Pro

RWS Homes, LLC

4.69(
38
)
Approved Pro
Customers say: Quality work
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers
53 local quotes requested

Visit Our New Website! www.RWSBuild.com RWS Building & Remodeling specializes in residential and commercial construction services, including design/build, home additions, add-a-level, and whole house remodeling. Our highly skilled and experienced craftsmen have provided construction and remodeling solutions, at competitive rates, for homeowners and businesses throughout Rockland and Northern Bergen Counties. For additional information or to arrange a consultation for your project at your Bergen County or Rockland County home or business, please contact RWS Building & Remodeling at 201-749-1001 or 845-213-2131. We would love to be a part of your next project!

"Wonderful experience with Rob and his crew. We have gone through construction before, and nothing compares to RWS. Excellent work, attention to the little details was so impressive. The crew becomes your friends, you can trust them 1000%. We are over the moon with the results. Better than I could ever have imagined and I had a specific vision."

Deborah M on April 2020

Visit Our New Website! www.RWSBuild.com RWS Building & Remodeling specializes in residential and commercial construction services, including design/build, home additions, add-a-level, and whole house remodeling. Our highly skilled and experienced craftsmen have provided construction and remodeling solutions, at competitive rates, for homeowners and businesses throughout Rockland and Northern Bergen Counties. For additional information or to arrange a consultation for your project at your Bergen County or Rockland County home or business, please contact RWS Building & Remodeling at 201-749-1001 or 845-213-2131. We would love to be a part of your next project!

"Wonderful experience with Rob and his crew. We have gone through construction before, and nothing compares to RWS. Excellent work, attention to the little details was so impressive. The crew becomes your friends, you can trust them 1000%. We are over the moon with the results. Better than I could ever have imagined and I had a specific vision."

Deborah M on April 2020

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FAQs for basement remodeling projects in Mahwah, NJ

Finishing a basement turns unused square footage into livable space and returns up to 70% of what you spend when you sell your home. Beyond that resale boost, you gain a playroom, home office, or guest suite you can start enjoying right away. That mix of daily comfort and solid return on investment (ROI) makes basement finishing one of the smartest upgrades you can tackle.

In some parts of the country—especially lots on swamps, high water tables, or other wetlands—local codes prohibit basements. Saturated soil puts constant pressure on foundation walls and lets water seep in faster than any sump pump can handle. 

If your property sits on waterlogged ground, building on a slab or crawl space is often safer, more affordable, and code-compliant.

Most basements wrap up in four to eight weeks. Framing takes three to five days, with electrical and plumbing rough-ins following over the next week. Add five days for drywall, two to three for flooring, and another week for paint, trim, and punch-list items. 

Delays can happen if materials run late or your contractor’s calendar is packed, so build in a little cushion when you plan.

Whether a finished basement counts toward your home’s official square footage depends on local rules. Many areas only include below-grade space if it has code-approved egress, fully finished walls, ceilings, and floors, plus consistent heating. 

Check with your local assessor or building department before you start; meeting those standards can affect taxes, appraisals, and resale value.

Building codes require a checklist: dedicated heat and electrical service, a code-approved stairway, and at least one egress window or exterior door. Walls, ceilings, and floors must be fully finished and meet insulation, ventilation, and fire-separation standards. If you add a bedroom, you’ll also need a closet, proper clearances, and safe exits. If you change the layout later, be ready to update the space so every new room still meets today’s code.

The Mahwah, NJ homeowners’ guide to basement remodelings

From average costs to expert advice, get all the answers you need to get your job done.