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Basement & Additions in Brooklyn & NYC

Expand your living space without moving. From basement finishing and underpinning to custom deck additions and home extensions — we handle every permit, every trade, and every detail.

All DOB Permits Before Work Starts
Structural Engineering Coordinated
Free On-Site Estimate
Licensed & Insured — 15+ Years

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Structural Permits & Engineering Before Construction

Basement dig-outs, home extensions, and additions involve structural changes that require NYC DOB permits, structural engineering sign-off, and multiple inspections. We coordinate everything — from the engineer's drawings to the final DOB sign-off — before any excavation or framing begins.

DOB Construction Permit
Structural Engineering
Foundation Inspections
Final DOB Sign-Off
What We Build

More Space, More Value,
More Living

Whether you're finishing a raw basement, adding a deck, or extending your home's footprint — we handle every type of addition project across NYC.

Basement Finishing

Transform raw or unfinished basements into livable space — framing, insulation, drywall, flooring, electrical, and plumbing

Basement Dig-Out

Excavate and underpin to increase ceiling height. Structural engineering, underpinning, waterproofing, and new concrete slab

Home Extensions

Expand your home's footprint — rear extensions, side additions, bump-outs, and second-story additions

Decks & Porches

Custom wood and composite decks, covered porches, pergolas, and outdoor living spaces with railings

Mezzanines & Lofts

Steel and wood mezzanine construction for residential and commercial spaces — maximize vertical space

Waterproofing

Interior and exterior basement waterproofing, French drains, sump pumps, and moisture barriers

Custom waterfront deck addition with composite decking and white vinyl railings
Maximize Your Property

Expand Your Living Space
Without Moving

Adding usable square footage is the highest-ROI improvement you can make to a NYC property. Whether it's finishing a basement, building a deck, or extending your home — we handle every phase from permits to punch list.

  • Basement framing, insulation, drywall, and flooring
  • Underpinning and basement dig-outs for full ceiling height
  • Foundation work — footings, block, rebar, concrete
  • Custom decks — pressure-treated, composite, cedar
  • Steel mezzanines and structural loft additions
  • Electrical, plumbing, HVAC for new spaces
  • Waterproofing, drainage, and egress windows
How It Works

Your Addition Project
in 6 Steps

Adding space to your home involves structural work, permits, and careful coordination. Our process keeps everything on track.

1

On-Site Assessment

We inspect your basement or property, discuss what you want to achieve, assess structural feasibility, and take measurements. We'll tell you honestly what's possible within your budget.

2

Engineering & Design

For structural work (dig-outs, extensions, mezzanines), we coordinate with a licensed structural engineer to produce the required drawings and calculations.

3

Permits & DOB Filing

We file for and obtain all required DOB permits — construction, plumbing, electrical, and structural. No excavation or framing begins until permits are approved.

All permits secured before work starts
4

Excavation & Structural

Excavation, underpinning, foundation work, steel installation, and framing. DOB inspections are scheduled at each structural milestone.

DOB structural inspection
5

Build-Out & Finishes

Insulation, drywall, electrical, plumbing, flooring, paint, and trim. Your new space takes shape with regular progress updates.

6

Final Inspection & Handoff

We schedule all required DOB inspections, walk the finished space with you, and hand over a fully permitted, fully finished addition ready to use.

DOB final sign-off
Our Work

Recent Basement & Addition Projects

Basements, decks, extensions, and additions completed across Brooklyn and NYC.

Custom deck with pergola and composite decking - Brooklyn addition
Elevated deck with decorative laser-cut metal railing panels
Waterfront deck addition with white vinyl railings
Basement excavation and underpinning with footing preparation
Basement finishing in progress - steel beams and drywall ceiling
Foundation block wall construction - crew building CMU walls on site
Steel mezzanine addition with exposed brick and skylight
Home addition in progress - foundation framing and block work
Custom outdoor storage structure with metal roof under elevated deck
Common Questions

Basement & Additions FAQ

Answers to the questions NYC homeowners ask us most about basements and additions.

Basement finishing costs in NYC typically range from $30,000–$80,000+ depending on size, scope, and finishes. A basic finishing (framing, drywall, flooring, basic electrical) for a standard Brooklyn basement runs around $30,000–$50,000. If you need a dig-out for more ceiling height, plumbing for a bathroom, or high-end finishes, costs can reach $60,000–$100,000+. We provide a detailed estimate before any work begins.
Yes — most basement finishing work in NYC requires DOB permits, especially if it involves electrical, plumbing, or any structural changes. Basement dig-outs and underpinning require structural engineering drawings and multiple DOB inspections. We handle the entire permit process and obtain all approvals before construction begins.
Underpinning is the process of deepening your existing foundation to increase basement ceiling height. Most older NYC basements have ceilings under 7 feet, which doesn't meet code for livable space. Underpinning involves excavating beneath the existing footings in sections, pouring new deeper footings, and then pouring a new concrete slab. It requires structural engineering and DOB permits — both of which we coordinate.
A standard basement finishing (no dig-out) typically takes 4–8 weeks. A basement dig-out with underpinning is more involved — usually 8–16 weeks for construction, plus 4–8 weeks upfront for engineering and permits. Deck and home extensions vary by size but generally take 4–10 weeks. We give you a clear timeline during the estimate phase.
In most cases, yes. NYC requires DOB permits for decks that are attached to the house, elevated above grade, or over a certain size. We assess your specific situation during the consultation and handle all permit filings. Building without permits can result in violations and forced removal.
Yes — adding a basement bathroom is one of our most common requests. It requires breaking the concrete slab to run drain lines, connecting to the existing waste stack, and often installing an ejector pump. We handle the plumbing, electrical, waterproofing, tile, and fixtures. Plumbing permits are required and obtained before any work begins.

Ready to Expand Your Living Space?

Get a free on-site estimate. Basements finished, decks built, additions permitted — all by one team.

Get Your Free Estimate → Call (718) 600-2747