A brownstone is a whole building: roof, facade, stoop, cellar and three or four floors of systems. That’s why brownstone budgets work differently from apartment budgets, and why approvals can include Landmarks as well as DOB.
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What a brownstone renovation costs
Published figures differ widely depending on scope and finish:
| Source | Published range |
|---|---|
| Brick Underground | about $300 to $500 per sq ft for a gut; $600 to $800 per sq ft with mechanical, electrical and plumbing upgrades |
| Chapter (Brooklyn townhouses, 2026) | about $350 to $550 per sq ft on average |
| Gallery KBNY (2026) | from $700 per sq ft baseline; $1,000 to $1,200+ for landmark restoration |
Cost figures are published estimates from the sources linked, not quotes from us. Prices change with labor and material costs; your number depends on your building and scope.
What brownstone projects usually involve
- Systems: new electrical service, replacing galvanized supply pipes, new heating or adding central air.
- Structure: leveling settled floors, sistering joists, repairing parapets and rear walls.
- Envelope: roof replacement, masonry repointing, window replacement, brownstone facade repair.
- Layout: opening the parlor floor, moving the kitchen, adding baths.
- Unit count: combining a two-family into a single-family, or the reverse.
- Details: restoring moldings, plaster, mantels and stairs, or reproducing them where missing.
Landmarks (LPC) approvals
If your house is an individual landmark or in a historic district, many exterior changes (windows, stoops, facades, rooftop and rear additions) need a Landmarks Preservation Commission permit (LPC Permit Guidebook). Some rear-yard additions that aren’t visible from a public street and meet LPC’s criteria can be approved at staff level; others go to a public hearing (LPC Guidebook: Additions). Interior-only work in a private house usually doesn’t need LPC review, but DOB filings for landmarked buildings are coordinated with LPC.
Changing the number of units
Converting a two-family to a one-family, or adding a unit, changes the building’s legal occupancy. That generally requires plans filed as an Alteration with a new Certificate of Occupancy, and can trigger multiple-dwelling requirements when the count reaches three or more. Check your current CO before you design. See also basement and ADU rules.
Working next to your neighbors
Row houses share walls. Expect to need protection agreements or access to a neighbor’s property for some work. In New York, if a neighbor refuses access needed for repairs, the owner can ask a court for a license under RPAPL 881. Talk to your attorney early.
Renovate or sell?
Some brownstone owners, especially heirs, would rather sell than take on a seven-figure renovation. iBuyAHome buys inherited and as-is houses, and we can show you both paths.
Who does the work
Every request is read by Naor Harari. Depending on the scope, the borough and the schedule, the job is either done by NH Construction or referred to our licensed partner contractor, an independent company that handles all trades. If your project is referred, we tell you the contractor’s name before they contact you, and you sign a contract directly with that contractor. Our partner contractor may pay iBuyAHome a referral fee. [PLACEHOLDER: attorney to approve this disclosure and the vetting steps we actually perform, e.g. DCWP license check, insurance certificate, references]
Before you sign with anyone, including us, check the contractor’s license on the DCWP license lookup and ask for a certificate of insurance.
Related: gut renovation · kitchen · home additions · all renovation services
Frequently asked questions
How much does it cost to renovate a brownstone in NYC?
Published estimates range from roughly $300 to $550 per square foot for many gut projects to $700 to $1,200 or more for luxury or landmark restoration, depending on scope and systems.
Do I need Landmarks approval to renovate my brownstone?
For many exterior changes in a historic district or on an individual landmark, yes. Interior work in a private house usually doesn’t need LPC review.
Can I convert my two-family brownstone to a single-family?
Often, but it changes the legal occupancy, so it typically requires filed plans and a new Certificate of Occupancy.
How long does a brownstone renovation take?
A full gut commonly takes a year or more including design and approvals. LPC review and hidden structural problems are the usual variables.
Should I renovate or sell an inherited brownstone?
It depends on your budget, timeline and the house. We can give you a renovation estimate and an as-is offer to compare.