Basement Finishing & Remodeling Expert in Long Island, NY

FREE Estimate

High-Quality Products

Cost Effective

Trusted and Reliable

20+ Years of Experience

Licensed, Bonded & Insured

30 Years of Warranty

5 Star Service

100% Customer Satisfaction

Zavza Seal LLC: Enhancing Your Home’s Potential
🏠 Elevating Spaces with Excellence
✨ Expert Basement Finishing & Remodeling in Long Island, NY. Why Opt for Us?
🆓 Free Estimate: Commence your transformation journey with a tailored, complimentary estimate
🌟 Premium Quality: Our commitment is to deliver nothing short of the best, offering high-quality products that stand the test of time.
💰 Budget-Friendly Solutions: Elevate your home affordably, maintaining excellence without breaking the bank.
🤝 Trust & Reliability: Rely on us to bring your vision to life, partnering with you every step of the way.
🕒 Decades of Experience: With over two decades of expertise, our skilled professionals bring mastery and insight to each project.
📜 Licensed, Bonded, & Insured: Your peace of mind matters; we hold full licenses, bonds, and insurance for your protection.
🌈 30-Year Warranty: Our work is backed by a 30-year warranty, demonstrating our confidence in its quality.
⭐ 5-Star Service: Our pursuit of excellence has earned us a stellar reputation, ensuring you experience top-tier service.
Get a FREE Estimate Now!

Taking Care of Your Basement is Our #1 Priority

Get A Free Estimate

Is it worth finishing a basement?

💯 Customer Satisfaction: Your happiness is our ultimate aim; we’re devoted to your contentment. Elevate Your Space with Zavza Seal Based in Long Island, Zavza Seal LLC, a locally owned and operated general contractor, takes pride in transforming basements into remarkable spaces.
🔧 Ready to Begin? Reach out for your Free Estimate today! Explore more at
Expert Basement Finishing & Remodeling in Long Island, NY
Get Your Free Estimate
Top-Quality Products
Affordable Solutions
Trusted and Dependable
Over 20 Years of Experience
Licensed, Bonded & Insured
30-Year Warranty
5-Star Service

100% Customer Satisfaction Serving the communities of Long Island, NY, Zavza Seal, a locally owned and operated general contractor, offers exceptional basement finishing & remodeling services. Request Your Free Estimate! Call Us at (631) 980-1800.
Prioritizing Your Basement’s Care and Transformation: Is Finishing a Basement Worth It? Completing a basement provides added foundation support. Unfortunately, many homeowners delay finishing their basements due to concerns about the project’s complexity and potential high costs. Quality foundation work is essential, and the scope of finishing work varies. Your specific needs differ from those of others.

It provides safety

Enhanced Safety: Basement finishing improves security, eliminates odors, and prevents pests. Unfinished basements are vulnerable to intruders and issues like radon gas leakage, impacting health.
Gives you more creative freedom
Creative Freedom: Basements offer additional space without zoning restrictions. It’s an ideal solution for those needing extra room when expanding elsewhere isn’t feasible. Increased Home Value:
Is it worth finishing a basement?
A finished basement appeals to buyers, raising your home’s resale value. Modern features enhance older homes, making them more attractive.
In the long run, it saves you extra costs.

Long-Term Savings: A finished basement reduces energy costs, as heating and cooling are more efficient. It’s cost-effective compared to above-ground expansions. Steps in Finishing a Basement Our basement remodeling process ensures a complete transformation:
Wall Finishing: We start with walls, adding insulation and drywall for warmth and aesthetics. Waterproofing addresses moisture issues.
Flooring: Basements need water-resistant floors due to potential flooding. These surfaces ensure durability and practicality.
Ceiling: Concealing wires and vents while providing access is crucial. Choose between a drop ceiling or drywall, based on your needs.
Egress Windows: These windows offer emergency exits and extra light. Their installation enhances safety and functionality.
{631) 980-1800

Adds value to your home

Even though home improvement projects can be pricey, they are ultimately worthwhile. If you intend to sell your house, having a completed basement will make it appear more appealing to potential buyers. Since you previously put in the work, the buyer won’t have to upgrade the cellar. An older house can be more contemporary by adding more modern features, which can increase appeal. Since your home’s resale value is likely to soar, you must have faith that you will recover the money you spent completing your basement. A basement restoration project may be just as alluring to purchasers as a bathroom or kitchen remodel.

In the long run, it saves you extra costs

A finished basement will also enable you to save money. Typically, it would help if you only used your air conditioner and heater to regulate the temperature of your basement because unfinished basements lack sealing. When your basement is finished, your appliances won’t have to work as much, resulting in lower energy costs. Additionally, finished basements are typically less expensive than above-ground expansions. This is because they don’t need to extend the house’s exterior, unlike when building a new room requires starting from scratch. They are instead redesigning an existing area.

Steps involved in finishing a basement

The following steps are involved in our basement remodeling process to add a complete look and feel to the basement.

Finish the basement’s walls

We’ll start here if your basement’s walls are just plain concrete. When the drywall is painted, and the insulation is placed, finished basement walls will make the room look finished, warm, and inviting. After building your walls, we will then hang your drywall. We will also use waterproofing cement if you have moisture issues.

Finish the basement floor

Due to the potential for flooding and exposure to water, basements require different flooring than other rooms in the house. Waterproof or water-resistant floors make for the greatest basement surfaces.

Finish the Basement Ceiling

We must conceal the wires, vents, and pipes visible on your basement ceiling while allowing access to them as necessary for a finished look. Depending on your basement’s needs, we will install either a drop ceiling or a drywall ceiling.

Install Egress Windows

An egress window is a window made to be big enough for an adult to climb in or out of as an emergency escape route and serves as a point of entry for firefighters and other emergency services. You’ll also have extra light if the basement window is big enough, so installing egress windows is necessary.

Why Hire Us?

We focus only on waterproofing and insulation services


We focus only on waterproofing to ensure you work only with the best

We use only high quality products for basement finishing

Quality Products

We use only high quality materials to ensure years of uncompromising performance

Our basement finishing service is very cost effective

Cost Effective

We deliver quality waterproofing service at reasonable prices

We provide five star services

5 Star Service

Our team is committed to delivering 100% customer satisfaction

What’s Next?

Request a free estimate

Request a Consultation

Schedule a consultation now and share with us your needs

Schedule a consultation

Schedule a Meeting

We set up a phone call and a subsequent meeting on location to understand the size of your project

Request a quote / contract

Quote / Contract

We deliver a quote for your work and if you agree provide a contract to start the job

We do the service requested


Our team of experts performs the work on location

100% customer satisfaction assured

100% Satisfaction

Our project manager ensures you are completely satisfied with the results

5 Star Google & Home Advisor Reviews

100% Google's Five Star Reviews
100% Home Advisor Five Star Reviews


Five Stars Reviews 1

Annette Casatelli

I received a few quotes to get the walls in my home filled in with blown in insulation. Zavza Seal was affordable and they did an excellent job.

They were very concerned with cleaning up, which I appreciated. I felt the difference in my home immediately. No more freezing cold walls. I recommend them, hands down.

Five Stars Reviews 2

Noemi Herles

Our experience with Zavza Seal was wonderful and smooth. The crew is well organized. They listen to your plans. They showed out in time. They left everything clean. They did an amazing job! I highly recommend this company.

Five Stars Reviews 3

Ellen Szuchmacher

Efficient, courteous and responsible workers. The job was quoted as being completed in 2 days but more work was required and they returned on the 3rd day and completed the job without additional charges. They reinsulated my crawlspace (not an easy job). I recommend Zavza Seal without reservation.

Five Stars Reviews 4

Michael Rutigliano

Couldn’t be more satisfied with the job Zavza Seal did. Brendan and Jake were accommodating, fair and extremely knowledgeable. Their team worked incredibly hard that day under difficult conditions and did a great job. I manage a multi-unit HOA and we will definitely be using them again.

Google Review Logo Bottom

Our Service Area Zip Codes In Long Island NY

Brooklyn NY
Brooklyn, NY 11204
Brooklyn, NY 11209
Brooklyn, NY 11215
Brooklyn, NY 11217
Brooklyn, NY 11218
Brooklyn, NY 11219
Brooklyn, NY 11223
Brooklyn, NY 11228
Brooklyn, NY 11229
Brooklyn, NY 11230
Brooklyn, NY 11231
Nassau County NY
Albertson, NY 11507
Atlantic Beach, NY 11509
Baldwin, NY 11510
Bayville, NY 11709
Bellmore, NY 11710
Bethpage, NY 11714
Carle Place, NY 11514
Cedarhurst, NY 11516
East Meadow, NY 11554
East Norwich, NY 11732
East Rockaway, NY 11518
Elmont, NY 11003
Farmingdale, NY 11735
Farmingdale, NY 11737
Floral Park, NY 11001
Floral Park, NY 11002
Franklin Square, NY
Franklin Square, 11010
Freeport, NY 11520
Garden City, NY 11530
Garden City, NY 11531
Garden City, NY 11599
Glen Cove, NY 11542
Glen Head, NY 11545
Glenwood Landing, NY 11547
Great Neck, NY 11020
Great Neck, NY 11021
Great Neck, NY 11022
Great Neck, NY 11023
Great Neck, NY 11024
Great Neck, NY 11026
Great Neck, NY 11027
Greenvale, NY 11548
Hempstead, NY 11549
Hempstead, NY 11550
Hempstead, NY 11551
Hewlett, NY 11557
Hicksville, NY 11801
Hicksville, NY 11802
Hicksville, NY 11815
Hicksville, NY 11819
Hicksville, NY 11854
Inwood, NY 11096
Island Park, NY 11558
Jericho, NY 11753
Jericho, NY 11853
Lawrence, NY 11559
Levittown, NY 11756
Locust Valley, NY 11560
Long Beach, NY 11561
Lynbrook, NY 11563
Malverne, NY 11565
Manhasset, NY 11030
Massapequa, NY 11758
Massapequa Park, NY 11762
Merrick, NY 11566
Mill Neck, NY 11765
Mineola, NY 11501
New Hyde Park, NY 11040
New Hyde Park, NY 11042
Oceanside, NY 11572
Old Bethpage, NY 11804
Old Westbury, NY 11568
Oyster Bay, NY 11771
Plainview, NY 11803
Point Lookout, NY 11569
Port Washington, NY 11050
Port Washington, NY 11051
Port Washington, NY 11052
Port Washington, NY 11053
Port Washington, NY 11054
Port Washington, NY 11055
Rockville Centre, NY 11570
Rockville Centre, NY 11571
Roosevelt, NY 11575
Roslyn, NY 11576
Roslyn Heights, NY 11577
Sea Cliff, NY 11579
Seaford, NY 11783
Syosset, NY 11773
Syosset, NY 11791
Uniondale, NY 11553
Uniondale, NY 11555
Uniondale, NY 11556
Valley Stream, NY 11580
Valley Stream, NY 11581
Valley Stream, NY 11582
Wantagh, NY 11793
West Hempstead, NY 11552
Westbury, NY 11590
Williston Park, NY 11596
Woodbury, NY 11797
Woodmere, NY 11598
Suffolk County NY
Amagansett, NY 11930
Amityville, NY 11701
Aquebogue, NY 11931
Babylon, NY 11702
Bay Shore, NY 11706
Bayport, NY 11705
Bellport, NY 11713
Blue Point, NY 11715
Bohemia, NY 11716
Brentwood, NY 11717
Bridgehampton, NY 11932
Brightwaters, NY 11718
Brookhaven, NY 11719
Calverton, NY 11933
Center Moriches, NY 11934
Centereach, NY 11720
Centerport, NY 11721
Central Islip, NY 11722
Cold Spring Harbor, NY 11724
Commack, NY 11725
Copiague, NY 11726
Coram, NY 11727
Cutchogue, NY 11935
Deer Park, NY 11729
East Hampton, NY 11937
East Islip, NY 11730
East Marion, NY 11939
East Moriches, NY 11940
East Northport, NY 11731
East Quogue, NY 11942
East Setauket, NY 11733
Eastport, NY 11941
Farmingville, NY 11738
Fishers Island, NY 6390
Great River, NY 11739
Greenlawn, NY 11740
Greenport, NY 11944
Hampton Bays, NY 11946
Hauppauge, NY 11788
Holbrook, NY 11741
Holtsville, NY 00501
Holtsville, NY 00544
Holtsville, NY 11742
Huntington, NY 11743
Huntington Station, NY 11746
Islandia, NY 11749
Islip, NY 11751
Islip Terrace, NY 11752
Jamesport, NY 11947
Kings Park, NY 11754
Lake Grove, NY 11755
Laurel, NY 11948
Lindenhurst, NY 11757
Manorville, NY 11949
Mastic, NY 11950
Mastic Beach, NY 11951
Mattituck, NY 11952
Medford, NY 11763
Melville, NY 11747
Melville, NY 11760
Melville, NY 11775
Middle Island, NY 11953
Miller Place, NY 11764
Montauk, NY 11954
Moriches, NY 11955
Mount Sinai, NY 11766
Nesconset, NY 11767
New Suffolk, NY 11956
North Babylon, NY 11703
Northport, NY 11768
Oakdale, NY 11769
Ocean Beach, NY 11770
Orient, NY 11957
Patchogue, NY 11772
Peconic, NY 11958
Port Jefferson, NY 11777
Port Jefferson Station, NY 11776
Quogue, NY 11959
Remsenburg, NY 11960
Ridge, NY 11961
Riverhead, NY 11901
Rocky Point, NY 11778
Ronkonkoma, NY 11779
Sag Harbor, NY 11963
Sagaponack, NY 11962
Saint James, NY 11780
Sayville, NY 11782
Selden, NY 11784
Shelter Island, NY 11964
Shelter Island Heights, NY 11965
Shirley, NY 11967
Shoreham, NY 11786
Smithtown, NY 11787
Sound Beach, NY 11789
South Jamesport, NY 11970
Southampton, NY 11968
Southampton, NY 11969
Southold, NY 11971
Speonk, NY 11972
Stony Brook, NY 11790
Stony Brook, NY 11794
Upton, NY 11973
Wading River, NY 11792
Wainscott, NY 11975
Water Mill, NY 11976
West Babylon, NY 11704
West Babylon, NY 11707
West Islip, NY 11795
West Sayville, NY 11796
Westhampton, NY 11977
Westhampton Beach, NY 11978
Wyandanch, NY 11798
Yaphank, NY 11980
Queens County NY
Addisleigh Park, NY 11433
Addisleigh Park, NY 11434
Arverne, NY 11692
Astoria, NY 11101
Astoria, NY 11102
Astoria, NY 11103
Astoria, NY 11104
Astoria, NY 11105
Astoria, NY 11106
Bayside, NY 11359
Bayside, NY 11360
Bayside, NY 11361
Bay Terrace, NY 11360
Beechhurst, NY 11357
Belle Harbor, NY 11694
Bellerose, NY 11426
Breezy Point, NY 11697
Briarwood, NY 11435
Broad Channel, NY 11693
Cambria Heights, NY 11411
Chinatown, NY 10013
College Point, NY 11356
Corona, NY 11368
Douglaston–Little Neck, NY 11362
Douglaston–Little Neck, NY 11363
East Elmhurst, NY 11369
East Elmhurst, NY 11370
East Elmhurst, NY 11371
Edgemere, NY 11690
Elmhurst, NY 11380
Far Rockaway, NY 11690
Far Rockaway, NY 11691
Far Rockaway, NY 11692
Far Rockaway, NY 11693
Far Rockaway, NY 11694
Far Rockaway, NY 11695
Far Rockaway, NY 11697
Floral Park, NY 11004
Floral Park, NY 11005
Flushing, NY 11374
Forest Hills, NY 11375
Fresh Meadows, NY 11365
Fresh Meadows, NY 11366
Fresh Pond, NY 11385
Glendale, NY 11385
Glen Oaks, NY 11004
Hollis, NY 11423
Howard Beach, NY 11414
Jackson Heights, NY 11372
Jamaica, NY 11411
Jamaica, NY 11412
Jamaica, NY 11413
Jamaica, NY 11414
Jamaica, NY 11415
Jamaica, NY 11416
Jamaica, NY 11417
Jamaica, NY 11418
Jamaica, NY 11419
Kew Gardens, NY 11415
Kew Gardens, NY 11418
Kew Gardens Hills, NY 11367
Laurelton, NY 11413
Long Island City, NY 11101
Long Island City, NY 11102
Long Island City, NY 11103
Long Island City, NY 11104
Long Island City, NY 11105
Long Island City, NY 11106
Long Island City, NY 11109
Middle Village, NY 11379
Neponsit, NY 11694
Ozone Park, NY 11416
Ozone Park, NY 11416
Pomonok, NY 11365
Queens Village, NY 11427
Queens Village, NY 11428
Queens Village, NY 11429
Rego Park, NY 11374
Richmond Hill, NY 11418
Ridgewood, NY 11385
Rochdale Village, NY 11434
Rockaway Beach, NY 11693
Rockaway Park, NY 11694
Rosedale, NY 11413
Rosedale, NY 11422
Roxbury, NY 12474
St. Albans, NY 11412
South Ozone Park, NY 11420
South Ozone Park, NY 11436
Springfield Gardens, NY 11413
Sunnyside, NY 11104
Whitestone, NY 11357
Woodhaven, NY 11421
Woodside, NY 11377