Home Addition Contractors NYC — Room Additions, Second Stories & Home Extensions

A home addition in NYC is a permanent expansion of your existing home — adding square footage by building out horizontally, up with a second story, or converting existing spaces like garages or basements. Dream Build Construction handles all types of home additions in Brooklyn and across NYC, including permits, structural work, and full interior finishing.

Home addition costs in Brooklyn range from $200–$500 per square foot depending on type and scope. A single-room addition may start around $60,000–$120,000; a full second-story can range $200,000–$400,000+. Dream Build Construction provides free, detailed written estimates — call 929-842-1717 to schedule a walkthrough.

A home addition in NYC typically takes 4–9 months from signed contract to final inspection. This includes 4–8 weeks for NYC DOB permit approval plus 3–6 months of construction depending on scope. Dream Build Construction provides a detailed project schedule upfront and weekly progress updates throughout the build.

Yes — all structural home additions in NYC require permits from the NYC Department of Buildings (DOB). Dream Build Construction handles all permit filings, architectural drawings, and DOB inspections as part of our service at no extra fee. We ensure full compliance with NYC building codes on every project.

With 20+ years of experience and 200+ additions built across Brooklyn and NYC, Dream Build Construction brings local expertise that national contractors can't match. We are fully licensed and insured, handle all permits in-house, self-perform structural work, and have a documented track record in Park Slope, Bay Ridge, Flatbush, Crown Heights, and Williamsburg. Call 929-842-1717 for a free estimate.

A home addition adds new square footage to your home — building outward, upward (second story), or converting unfinished space like a garage or basement into livable area. A renovation modifies existing space without changing the footprint. Additions in NYC require DOB permits, structural engineering, and often zoning review; renovations may only need a standard alteration permit. Dream Build Construction handles both — call 929-842-1717 for a free consultation.

FAR (Floor Area Ratio) is the NYC zoning rule that caps how much total floor area you can build relative to your lot size. Most Brooklyn residential zones (R1–R6) allow FAR between 0.5 and 2.43. Before designing a home addition, we calculate your remaining FAR, sky-exposure plane, and yard requirements. If your lot is at maximum FAR, options include garage conversions, basement finishing, or as-of-right enlargements that don't add FAR. Dream Build Construction reviews zoning at no cost during your consultation.

Yes, in many cases. Adding a story to a Brooklyn brownstone or rowhouse requires structural reinforcement of existing walls and foundation, NYC DOB approval, and — if your home is in a Brooklyn historic district like Park Slope, Brooklyn Heights, or Cobble Hill — Landmarks Preservation Commission (LPC) approval. Expect 6–9 months total including permits. Dream Build Construction has built dozens of vertical additions across Brooklyn and handles every step including LPC filings.

Most NYC homeowners finance home additions through a HELOC (home equity line of credit), cash-out refinance, FHA 203(k) renovation loan, or a construction loan that converts to a mortgage. Banks typically lend up to 80–90% of post-renovation appraised value. Dream Build Construction provides the detailed scope of work and itemized estimate that lenders require, and can refer you to local Brooklyn lenders experienced with renovation financing.

Spring (March–May) is ideal for starting a home addition in NYC because permit reviews are faster after the winter backlog, exterior framing benefits from dry weather, and projects finish before the next winter. However, design and permitting can begin any time — many of our clients start the permit process in fall/winter so construction begins in spring. Dream Build Construction works year-round and our heated site setup keeps interior work moving even in January.