Start with a complimentary consultation. We create professional architectural plans and a 3D design of your addition — saving you up to $15,000 in design fees.
02
Zoning, Survey & Permits
We handle the property survey, zoning setbacks and lot-coverage, any variance or wetlands review, and all permits with your Connecticut town — so the addition is fully compliant.
03
In-House Build
Once work begins, we're on-site every day. Our "no ghosting" policy means constant progress — foundation, framing, and finishes by one in-house crew, tied cleanly into your existing home.
04
Final Handover
We conduct a rigorous quality check — structure, weather-sealing, and finishes — before handing over your finished addition, backed by our written warranty.
Local Expertise
Home Additions in Cos Cob, Connecticut
Cos Cob pairs Mianus River waterfront with historic village homes, and both shape how an addition gets built here. Many properties near the river sit in flood zones and fall under Inland Wetlands (IWWA) review, so an addition has to meet flood-elevation and coastal-construction rules from the foundation up. Omega Development has expanded Cos Cob homes with that in mind for more than 20 years.
As part of Greenwich, Cos Cob carries the town's full review process — Planning & Zoning, Inland Wetlands, and coastal requirements can all come into play on a single addition. We handle the survey and sequence those approvals up front, design the addition in 3D, and build it with one in-house crew from foundation to finish, managing permits and inspections start to finish.
What to know about a home addition in Cos Cob
Near the Mianus River and on low-lying lots, an addition often sits in a FEMA flood zone, which drives the foundation design — elevation, flood venting, and materials that tolerate the coastal environment. Many of these properties also fall under Inland Wetlands (IWWA) review, which can influence where the addition can go and add time to the approval phase, so we plan it before design is finalized.
In Cos Cob's older village homes on tighter lots, setbacks and coverage often steer an addition toward a bump-out or second story rather than a large outward expansion. Cost is driven by the flood-zone foundation work, the addition's size, and finishes — a great-room or primary-suite addition in Cos Cob commonly runs in the low-to-mid six figures, itemized in your written estimate before we begin.
Flood-smart additions near the Mianus River
On Cos Cob's waterfront and low-lying lots we build additions that meet flood-elevation and coastal-construction rules and navigate Inland Wetlands review; in the village's older homes we expand within tight setbacks while keeping the character intact.
Serving every Cos Cob neighborhood, including:
Mianus River WaterfrontPalmer HillRock RidgeMillbrookDowntown Cos Cob Village
Cos Cob, CT · 06807
What Cos Cob-area homeowners say
4.9
Based on 33+ verified Google reviews
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Jo Vo
2 years ago
It was a pleasure working with Inacio and the Omega team! My home renovation project was not an easy or simple one, with many challenges along the way, as most construction projects tend to be. Inacio was able to navigate his way through the tough times and find solutions, ultimately leading to a stellar finished product, far exceeding expectations. What's also nice is that we've developed and continue to maintain a strong relationship even to this day. Inacio is a great person and a solid resource to have.
JB
John Bazzano
7 months ago
Inacio and his team at Omega built a stunning three-season porch for my family. There aren't enough words to say how impressed we were with his honesty, integrity, and craftsmanship. Inacio was always available and frequently came to check on the work. His team is professional and meticulous — especially the finish carpentry guys, amazing! When an issue came up, Inacio fixed it, no questions asked — truly a man of his word. I will never use anyone else. I HIGHLY recommend him!
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Mike Veras
3 months ago
Omega Development renovated my home's living room, hallway, two full bathrooms, and a half powder room after a water leak from the second-floor bathroom. I was amazed by Omega crew's craftsmanship and detail-oriented finishes — the work really came out great. I fully recommend them.
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Andy Tregurtha
4 months ago
Absolutely incredible team!! Very consultative and always striving to perform first-in-class service at a great price. They match your desires and dreams for a project and thoroughly cover all bases, so you're satisfied not only now but for the long term. 10/10 recommend — they are phenomenal!!
JP
Joye Preece
5 months ago
Omega did two jobs for us and we are so pleased with the results. They have skilled workers who complete whatever you ask while keeping the rest of the home and their work area as clean as possible. They replaced sheet rock and repainted a ceiling in one room, then did a tile demo and wall/tile install in another bathroom. Very timely — they'd arrive early to get started as soon as they could.
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Marc Trimuschat
8 months ago
Fantastic experience with Omega on the renovation of my home. Inacio and his team were always there, over-communicating, and the end results are extremely high quality. It's hard to find honest, high-quality contractors today, and I'm delighted to have hired Inacio and his team — I'd recommend them highly to anyone.
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Mary Noel
a year ago
The best! I cannot recommend Inacio, Rafa, and their entire team more highly. Omega Development executed a major home renovation for my family — extending our living room, a full kitchen reno, and an additional master bedroom and bath.
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Pedro Viggiano
a year ago
I recently had my kitchen and bathroom renovated and my bar area completely redone by Omega Development, and I couldn't be happier with the results. From start to finish, their team provided top-notch service.
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Jose Quintao
5 months ago
Great work by Omega Development. Inácio is very professional, responsible, and committed to quality. Very trustworthy company!
JP
Jonnatan Pinheiro
8 months ago
I had a great experience with Omega. Very reasonably priced. They were very committed to our project. I strongly recommend them.
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Cleiton Leite
4 months ago
What a great experience to work with Omega. I strongly recommend them.
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roisinblack
Jan 16, 2025
We have used Omega for all our needs these past few years. That has included everything from minor repairs, a full house painting (inside and out), and floor refinishing, to an addition on the third floor.
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Cos Cob Home Additions FAQ
Yes. Additions in a FEMA flood zone must meet elevation and coastal-construction requirements in the foundation, and many riverfront lots also require Inland Wetlands (IWWA) review. We handle both as part of the project.
Fairfield County additions run roughly $200 to $500+ per square foot; flood-zone foundations add to that. A great-room or primary-suite addition in Cos Cob commonly lands around $180,000 to $420,000+. You get an itemized quote after a free consultation.
Yes. We manage the survey, Greenwich/Cos Cob Planning & Zoning review, Inland Wetlands (IWWA) review where triggered, building permits, and inspections through to sign-off.
Construction usually runs about 3–6 months on site; wetlands and flood-zone approvals can add time on the front end. We map the full timeline with your quote.
