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Find Second story addition builders in Allendale

Avatar for Sentri Homes

Sentri Homes

No reviews yet

Sentri Homes

No reviews yet
2698 local quotes requested

Sentri Homes is a full-service contractor delivering high-end home additions, whole-home remodels, new custom builds, luxury kitchens, structural framing, roof replacements, and every major renovation. We assign a dedicated project manager to every job, deliver meticulous craftsmanship with clear communication, and back our work with an industry-leading warranty to ensure complete peace of mind on your largest investments. Our in-house team of licensed builders and master craftsmen consistently earns 5-star reviews by turning big visions into stunning, high-value homes—when you need one trusted partner who truly does it all, we’re the proven choice.

Sentri Homes is a full-service contractor delivering high-end home additions, whole-home remodels, new custom builds, luxury kitchens, structural framing, roof replacements, and every major renovation. We assign a dedicated project manager to every job, deliver meticulous craftsmanship with clear communication, and back our work with an industry-leading warranty to ensure complete peace of mind on your largest investments. Our in-house team of licensed builders and master craftsmen consistently earns 5-star reviews by turning big visions into stunning, high-value homes—when you need one trusted partner who truly does it all, we’re the proven choice.


rams home improvement

No reviews yet

rams home improvement

No reviews yet
41 years of experience

work alone or with 1 or 2 helpers.charge by the hour or the amount of work

work alone or with 1 or 2 helpers.charge by the hour or the amount of work


Project Management Inc.

No reviews yet

Project Management Inc.

No reviews yet
12 years of experience

Don't start your renovation project without consulting with Project Management Inc. We protect you against cost over runs, delays and contractor mistakes.

Don't start your renovation project without consulting with Project Management Inc. We protect you against cost over runs, delays and contractor mistakes.


Avatar for AJ Perri

AJ Perri

4.31(
1,533
)

AJ Perri

4.31(
1,533
)
Customers say: Super punctual
54 years of experience

For fast and exceptional service for all of your heating, cooling or plumbing needs, call us now: 732-333-3655! Since 1971, A.J. Perri has been proudly serving New Jersey homeowners and businesses across Bergen*, Essex, Mercer, Middlesex, Monmouth, Morris*, Ocean*, Somerset, Passaic*, Hudson*, Sussex*, and Union counties. With over 50 years of experience in heating, air conditioning, plumbing, and indoor air quality systems, A.J. Perri stands behind every installation, service and product with an unmatched 100% satisfaction guarantee. A.J. Perri offers you peace of mind and an established reputation for reliability, quality, and excellence in customer service. You can trust A.J. Perri to take care of your furnace, air conditioner or plumbing repair, service, or replacement. A.J. Perri can also help you with your heat pump, air handler, ductless split system, water heater or purification, sump pump, air cleaner, air filtration system, humidifier, and air ducts. Contact us if you have any questions about service in your area. Service offered 24/7/365. For more information: call or email us at info@ajperri.com. *Additional info: Not all services available in all areas. License# 19HC00103100, 36BI01256600, PA- PA126178

"I had these guys put in a heating and cooling system last June. My father is 86 years old with dementia living in this house with the nurse and the heat keeps dropping down to 58° and they tell me they can?t be out there for five days, today is Thursday and they can?t make it out there till Tuesday. I would have to say stay away from this company. "

Steve A on December 2025

For fast and exceptional service for all of your heating, cooling or plumbing needs, call us now: 732-333-3655! Since 1971, A.J. Perri has been proudly serving New Jersey homeowners and businesses across Bergen*, Essex, Mercer, Middlesex, Monmouth, Morris*, Ocean*, Somerset, Passaic*, Hudson*, Sussex*, and Union counties. With over 50 years of experience in heating, air conditioning, plumbing, and indoor air quality systems, A.J. Perri stands behind every installation, service and product with an unmatched 100% satisfaction guarantee. A.J. Perri offers you peace of mind and an established reputation for reliability, quality, and excellence in customer service. You can trust A.J. Perri to take care of your furnace, air conditioner or plumbing repair, service, or replacement. A.J. Perri can also help you with your heat pump, air handler, ductless split system, water heater or purification, sump pump, air cleaner, air filtration system, humidifier, and air ducts. Contact us if you have any questions about service in your area. Service offered 24/7/365. For more information: call or email us at info@ajperri.com. *Additional info: Not all services available in all areas. License# 19HC00103100, 36BI01256600, PA- PA126178

"I had these guys put in a heating and cooling system last June. My father is 86 years old with dementia living in this house with the nurse and the heat keeps dropping down to 58° and they tell me they can?t be out there for five days, today is Thursday and they can?t make it out there till Tuesday. I would have to say stay away from this company. "

Steve A on December 2025


ABBOT O'REILLY CONTRACTING

No reviews yet

ABBOT O'REILLY CONTRACTING

No reviews yet
30 years of experience

We have over 20 years experience in the field and incorporated since 1995, licensed, insured, bonded and a member of the BBB

We have over 20 years experience in the field and incorporated since 1995, licensed, insured, bonded and a member of the BBB


Jonathan Alexander & Sons Moving

No reviews yet

Jonathan Alexander & Sons Moving

No reviews yet
50 years of experience

Alexander & Son's Moving has over 30 years of experience in the moving industry. We are a professional family owned business that will handle your items with care from beginning to end. We will make the relocation process an easy one. We have reputable references, please contact us for more information.

Alexander & Son's Moving has over 30 years of experience in the moving industry. We are a professional family owned business that will handle your items with care from beginning to end. We will make the relocation process an easy one. We have reputable references, please contact us for more information.


AFZ Contracting

No reviews yet

AFZ Contracting

No reviews yet
46 years of experience

business is insured and carries workers comp

business is insured and carries workers comp


JJ MASONRY & CONCRETE LLC

No reviews yet

JJ MASONRY & CONCRETE LLC

No reviews yet
21 years of experience

Welcome to JJ Masonry & Concrete! We are a fully licensed and insured Masonry & Concrete company operating out of New York City with 15 years of experience in the industry. We work closely with our clients to come up with the best solutions for the project at hand. We have an outstanding management team paired with some of the most safest and knowledgeable working crews in NYC. We go above and beyond our scope of work and at unbeatable prices. Please call JJMC today to inquire about your next project!

Welcome to JJ Masonry & Concrete! We are a fully licensed and insured Masonry & Concrete company operating out of New York City with 15 years of experience in the industry. We work closely with our clients to come up with the best solutions for the project at hand. We have an outstanding management team paired with some of the most safest and knowledgeable working crews in NYC. We go above and beyond our scope of work and at unbeatable prices. Please call JJMC today to inquire about your next project!


Avatar for Double D Construction

Double D Construction

4.94(
93
)

Double D Construction

4.94(
93
)
Customers say: Quality work
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers

Double D Construction has been serving Central New Jersey since 1995. We do complete residential and commercial construction, following up with you after the job is complete to make sure everything is done to your satisfaction. Our staff takes pride in the quality of our workmanship and provides custom designed service to meet your every need. Award winning.

"Just a few years ago, we hired Double D to remove all of the old bright yellow siding (40 years old) and remove both layers of old roofing. The goal was to replace the roof and figure out the best options for us regarding the siding. The owner came out, met with us, presented options and associated costs quite clearly. Ultimately, we choose a lovely shade of sage green siding and a gray roof. We could not be happier. The employees were polite and efficient. The work was done in a timely manner (less than two weeks) and still looks great. We had zero problems with Double D. I plan on using them again to update a section of the siding that had previously been covered by a back deck. IMPORTANT NOTE: My neighbors replaced their siding with another company even though we advised them that Double D’s pricing was spot on and extremely professional, with attention to detail. Five months after their siding was installed, huge swaths of siding fell off! And their contractor was no where to be found. That’s when they asked for Double D! You will not regret utilizing Double D and will appreciate the variety of services available."

Cj F on July 2023

Double D Construction has been serving Central New Jersey since 1995. We do complete residential and commercial construction, following up with you after the job is complete to make sure everything is done to your satisfaction. Our staff takes pride in the quality of our workmanship and provides custom designed service to meet your every need. Award winning.

"Just a few years ago, we hired Double D to remove all of the old bright yellow siding (40 years old) and remove both layers of old roofing. The goal was to replace the roof and figure out the best options for us regarding the siding. The owner came out, met with us, presented options and associated costs quite clearly. Ultimately, we choose a lovely shade of sage green siding and a gray roof. We could not be happier. The employees were polite and efficient. The work was done in a timely manner (less than two weeks) and still looks great. We had zero problems with Double D. I plan on using them again to update a section of the siding that had previously been covered by a back deck. IMPORTANT NOTE: My neighbors replaced their siding with another company even though we advised them that Double D’s pricing was spot on and extremely professional, with attention to detail. Five months after their siding was installed, huge swaths of siding fell off! And their contractor was no where to be found. That’s when they asked for Double D! You will not regret utilizing Double D and will appreciate the variety of services available."

Cj F on July 2023


Miller General Contracting, Ltd.

5.00(
3
)

Miller General Contracting, Ltd.

5.00(
3
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

10% off kitchen cabinets and counters! Limited time! Our experienced and professional crews have been with us for an average of twelve years. We work very neatly in your occupied home, completely cleaning upon completion. The work is completed to your expectation to the finest detail. We work with our clients in a creative synergy so that the outcome doesn't just meet your expectations, it exceeds them! Financing available.

10% off kitchen cabinets and counters! Limited time! Our experienced and professional crews have been with us for an average of twelve years. We work very neatly in your occupied home, completely cleaning upon completion. The work is completed to your expectation to the finest detail. We work with our clients in a creative synergy so that the outcome doesn't just meet your expectations, it exceeds them! Financing available.

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FAQs for second story addition building service projects in Allendale, NJ

For many homeowners, building up is worth the expense because it provides the extra bedrooms or living areas that can’t be accommodated within the existing footprint. A larger, updated home often commands a higher resale price, recouping a sizable share of the project cost while allowing you to stay in the neighborhood you love. Run the numbers with a real estate agent and contractor to ensure the expected return and day-to-day benefits align with your goals.

Whether it makes more sense to build up or out depends on your lot, budget, and local code. Building up preserves yard space and involves less foundation work, but you may need to vacate the home during construction. Building out avoids staircases and can proceed while you stay put; however, it encroaches on the yard and may face setback limits. Compare both options with your contractor before making a decision.

A structural engineer will first inspect the existing foundation for cracks, footings, and load capacity. Depending on the findings, the crew may pour new concrete footings, install steel or concrete piers, add reinforced beams, or tie additional rebar into the slab. These upgrades redistribute the weight of the new floor and bring the structure up to code. Your contractor will outline the specific reinforcement plan and timeline once the engineering report is complete.

The Allendale, NJ homeowners’ guide to second story addition building services

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