How Long Does a Brownstone Renovation Take in NYC?
By Daniel Kidd AIA | May 13, 2026 | Brownstone Renovation, Brooklyn
If you own a brownstone in New York City, or you're thinking about buying one, the question of timeline is usually one of the first things that comes up. And for good reason: brownstone renovations are complex, layered projects that involve a lot more than just construction. There are approvals, permits, inspections, and the particular challenges that come with a 19th-century building that's been lived in for over a hundred years.
The honest answer? From the day you start working with an architect to the day you move in, most brownstone renovations take 18 months to 2 years. Some are faster, many take longer. Here's what drives the timeline and how to think about planning yours.
A Realistic Brownstone Timeline
Here's how a full brownstone renovation typically breaks down:
Phase Typical duration
Design and construction drawings 2–4 months
LPC approval (if landmark district) 2–6 months
DOB filing and permit review 2–4 months
Contractor selection and procurement 1–2 months
Construction 6–18 months
Final inspections and sign-off 2–4 weeks
Total (start to finish) 18 months – 2+ years
Note that some of these phases overlap; LPC and DOB review can happen in parallel with contractor selection, for example, which is why working with an experienced architect who manages the process proactively matters so much.
What Makes Brownstones Take Longer Than Apartments
Brownstone renovations consistently run longer than apartment renovations for a few specific reasons:
The building envelope. Unlike an apartment, a brownstone renovation often involves the entire building, roof, façade, foundation, and rear yard. Each of these elements adds scope, cost, and time.
Narrow, vertical buildings. Brownstones are tall and narrow, which means that all materials, equipment, and debris move through tight spaces and multiple flights of stairs. This slows construction in ways that are hard to appreciate until you're in the middle of it.
Pre-war surprises Behind the walls of a 100-year-old building, you'll almost always find something that wasn't in the drawings: outdated cloth wiring, galvanized pipes, improper prior renovations, or structural elements that need addressing. Build contingency into your schedule as well as your budget.
Landmark requirements: Working in a landmarked district adds an entire approval layer that apartments in newer buildings don't face. Windows must match historic profiles. Façade materials need LPC sign-off. Even the color of your front door can be subject to review.
How to Keep Your Project on Track
A few things that consistently help brownstone renovations run on schedule:
Start early. The approval process has long lead times that are largely outside your control. The sooner you engage an architect, the sooner that clock starts.
Make decisions early. Change orders mid-construction are one of the biggest causes of delays. Resolve design decisions before construction begins so your contractor can execute without stopping to wait for answers.
Order long-lead items in advance. Custom windows, specialty tile, and certain plumbing fixtures can take 12–20 weeks to arrive. Your architect should be tracking these from the start.
Build in contingency. Plan for the project to take longer than the optimistic scenario. It almost always does.
Working with PLANS on Your Brownstone
At PLANS, we've guided brownstone owners through every phase of this process from the first sketch through the final inspection. We handle design, DOB filings, LPC coordination, contractor selection, and construction administration. Our goal is to make a complex process as predictable and smooth as possible.
If you own a brownstone and are thinking about renovating, or you're evaluating a brownstone purchase and want to understand what you're getting into, we'd love to talk.
Reach us at plans.nyc or call (914) 979-7751.