From Park Slope stoops to Harlem facades, from Bed-Stuy brownstones to Riverdale brickwork — Keystone Restorations repairs, restores, and protects New York's historic masonry the right way. No shortcuts. No wrong mortar. No permit headaches left for you to handle.
Keystone Brownstone Restoration has been preserving the architectural soul of New York City for over two decades. We know that a 130-year-old brownstone isn't just a building — it's a piece of the city's identity. That's why we treat every project with the craftsmanship, proper materials, and regulatory knowledge it demands.
Too many property owners have learned the hard way what happens when a contractor uses hard Portland cement on soft brownstone, or skips the LPC filing because "it's just a small repair." We've seen the cracks, the spalling, the water infiltration, the DOB violations. We exist to make sure that never happens to you.
Every project we take on — from a single stoop repoint in Staten Island to a full facade restoration on a landmarked Harlem townhouse — gets the same meticulous, code-compliant treatment.
We handle every aspect of your brownstone's exterior — from the mortar joints between bricks to the ornamental cornice at the roofline. All work is performed to NYC DOB standards and Landmarks Preservation Commission guidelines.
Full assessment, color-matched patching, lime consolidant treatment, and pigmented coating restoration. We restore original sandstone facades to their historical character using materials compatible with the existing stone — no Portland cement shortcuts.
Most PopularWe remove deteriorated mortar to the proper depth (minimum ¾"), clean joints, and apply correctly formulated mortar matched to your brick's hardness and porosity. We use Type S or NHL lime mortars for historic buildings — never hard Portland cement that damages soft brick.
All BoroughsNYC stoops take tremendous wear. We rebuild deteriorating stoop walls, replace cracked treads and risers, restore handrails, and repair sidewalk vault waterproofing beneath the stoop — addressing root causes, not just surface symptoms.
Structural ExpertiseIf your property is in a NYC Historic District, we manage the entire Landmarks Preservation Commission process — from Certificate of No Effect (CNE) for in-kind repairs to Certificate of Appropriateness (CofA) for facade changes. You don't navigate the bureaucracy; we do.
Landmark SpecialistFailing parapet walls are both a DOB violation and a genuine safety hazard. We rebuild, repoint, and waterproof parapet walls to bring them into full compliance, eliminating violations and protecting the people below from falling masonry.
DOB ComplianceWater is the single greatest threat to brownstone. After restoring your masonry, we apply breathable, penetrating sealers appropriate for historic sandstone and brick — protecting without trapping moisture inside the wall, which is a common cause of accelerated damage.
Prevention FocusedChimneys are the first place water gets in. We repoint chimney crowns, replace deteriorated flashing, rebuild damaged caps, and restore the masonry from crown to firebox — preventing interior water damage before it starts.
All HeightsReceived a NYC Department of Buildings violation for unsafe facade conditions, failing brickwork, or parapet issues? We have an established track record of efficiently resolving violations — from inspection to repairs to official sign-off — including FISP (Local Law 11) compliance for larger buildings.
Urgent ResponseNot sure how serious the damage is? We perform thorough facade assessments — including sounding tests, moisture readings, and mortar analysis — to give you an honest, documented picture of your building's condition before any work begins.
Free ConsultationNo matter where your brownstone or brick building is located in New York City, Keystone Restorations brings the same standard of expertise, the same materials, and the same commitment to your property.
After two decades in this industry, we've repaired the damage done by other contractors more times than we can count. Here's what separates us from contractors who say they do historic masonry but don't truly understand it.
Any contractor who says this about exterior work on a Landmarks-designated property is either uninformed or hoping you don't find out about the violation until after they've been paid. Unpermitted exterior work in a historic district can freeze your property sale, trigger stop-work orders, and require costly teardown and redo work at your expense.
A contractor who starts grinding joints without first testing what mortar is in there doesn't understand historic masonry. Original brownstone buildings used lime mortars. Repointing over them with a harder mortar mix destroys the stone, not just the joint.
"Repoint front facade" is not a scope of work. It doesn't say how deep the joints will be ground, what mortar will be used, whether scaffolding is included, what happens to ornamental details, or who is responsible for permits. Ambiguity is how you get substandard work with no recourse.
Already got a quote from another contractor? We'll review their scope of work and tell you honestly if it's appropriate for your building. No charge, no pressure. Call 646-919-4496.
Every Keystone project follows the same proven sequence — designed to protect you from surprises and deliver results that last decades, not years.
We come to your property, walk the facade, sound the masonry, identify deterioration patterns, check for water infiltration sources, and review your Landmarks designation status.
You receive a line-by-line estimate: scope of work, mortar specification, materials, scaffolding costs, permit fees, timeline, and warranty terms. No surprise additions later.
For Landmarks properties, we file for your Certificate of No Effect or Certificate of Appropriateness and coordinate all DOB permits. You don't attend hearings or navigate agency websites.
Before full-scale work begins, we prepare test panels for mortar color and brownstone patch color approval — ensuring the restoration is invisible, not obvious.
Our experienced masons execute the work to the approved scope, with daily site supervision and quality checks. Scaffolding is set up safely and removed promptly when the work is done.
We walk the completed work with you, address any questions, and provide your written workmanship warranty documentation. We also advise on a simple annual maintenance routine to extend the life of the restoration.
We believe in transparency. Here are honest price ranges for the most common work we do in New York City. Your exact cost depends on building size, condition, accessibility, and Landmarks requirements. We'll give you a precise number after our free assessment.
| Service | Typical Range (2026) | Notes |
|---|---|---|
| Brick Pointing / Repointing | $15 – $35 per sq ft | Standard residential; 3-story brownstone front facade: $10,000 – $25,000 |
| Brownstone Facade Patching & Coating | $28,000 – $65,000 | Standard 20×40 rowhouse facade; includes color-matched pigmented finish |
| Full Brownstone Facade Restoration | $85,000 – $250,000+ | True stone replacement using quarried brownstone; ornamentation extra |
| Stoop Restoration / Rebuild | $18,000 – $60,000 | Includes vault waterproofing under stoop: add $12,000 – $35,000 |
| Parapet Wall Repair | $8,000 – $30,000 | Depends on run length, condition, and whether rebuilding is required |
| Chimney Repair & Crown | $2,500 – $15,000 | Full chimney rebuild from roof line: additional cost |
| LPC Filing & Permit Handling | Included in project scope | CNE (same-day) or CofA (3-6 month process for major changes) |
| DOB Violation Removal | Quote after inspection | Includes all repair work, inspections, and sign-off coordination |
⚠️ Important: Any quote significantly lower than these ranges almost always indicates wrong mortar type, insufficient joint depth, missing permits, or cutting corners on material matching. We're happy to review any other estimate you've received and tell you what's missing from it.
Most of brownstone Brooklyn, Harlem, and many other NYC neighborhoods fall within designated Landmarks Historic Districts. This means any exterior repair — even repointing mortar joints — technically requires Landmarks Preservation Commission review before work begins.
Contractors who ignore this leave you exposed to stop-work orders, fines, and violations that can halt a property sale, complicate refinancing, and require costly removal of unpermitted work. We've seen it happen dozens of times.
Keystone Restorations has a dedicated process for LPC filings. We photograph the existing conditions, document material specifications, prepare test panels, and submit through the LPC's Portico system on your behalf. Our submission record speaks for itself: 100% of our LPC applications have been approved.
Key NYC Historic Districts we regularly work in: Park Slope, Brooklyn Heights, Boerum Hill, Carroll Gardens, Clinton Hill, Cobble Hill, Crown Heights, Bedford-Stuyvesant, Fort Greene, Harlem, Hamilton Heights, Upper West Side, Upper East Side, Greenwich Village, NoHo, SoHo, Riverdale, and more.
Understanding which one your project needs prevents costly delays.
Our Park Slope brownstone had been repointed by a previous contractor with the wrong mortar and the facade was actively spalling. Keystone came out, explained exactly what had happened and why, matched our original stone color perfectly, and handled the LPC filing without us lifting a finger. The facade looks like it was built yesterday.
We had a DOB violation for an unsafe parapet on our Harlem brownstone and were panicking about the timeline. Keystone handled everything — the emergency inspection, the repair scope, the DOB permit, the actual rebuilding work, and the final sign-off. From violation to clearance in six weeks. Incredibly professional.
I got three quotes for brick pointing on our three-story rowhouse in Ridgewood. Keystone wasn't the cheapest, but they were the only contractor who told me what mortar type they'd use and why, showed me photos of similar projects, and put everything in writing. The other guys couldn't even tell me if we needed an LPC permit. Choose Keystone.
My stoop was crumbling and the sidewalk vault below was leaking into my basement every time it rained. Keystone restored the stoop, waterproofed the vault, and repointed the entire front facade. Completely dry basement ever since. I wish I'd called them before paying someone else $4,000 for a patch job that lasted two seasons.
As a property manager overseeing 14 buildings across Brooklyn and the Bronx, I've worked with a lot of masonry contractors. Keystone is the only company I trust for historic brownstone work. Their LPC knowledge alone saves me weeks of headaches on every project.
The chimney above our Riverdale co-op was deteriorating badly and leaking into the top-floor unit. Keystone rebuilt the chimney stack, replaced the flashing, repointed the entire roof-level brickwork, and had everything done in one week. Clean, professional, and exactly on the quoted price.
Look for: crumbling or recessed mortar joints (you can push a key into the joint), sandy residue on the ground along the facade, visible cracks, gaps between the stone and mortar, or water stains appearing on interior walls after rain. Any of these signals it's time to call us.
Technically yes, but the risks are severe. Using the wrong mortar — too hard, wrong lime content — can cause more damage than the original deterioration. On a Landmarks property, DIY exterior work without LPC approval can result in violations and forced removal. We strongly advise against it.
Natural Hydraulic Lime (NHL) mortar or a Type S lime-based mortar matched to the hardness and porosity of the existing stone. Never standard Portland cement, which is significantly harder than soft brownstone sandstone and will cause spalling, not prevent it.
When done correctly with the right lime mortar, repointing should last 20–30 years. Buildings previously repointed with hard Portland cement may need remediation sooner because the cement causes ongoing damage to the surrounding stone.
For any building over two stories, yes — scaffolding is required both for safety and to do the work properly. We include scaffolding costs in our estimates so there are no surprises. For ground-floor and accessible areas, we use ladders and boom lifts where appropriate.
A standard repointing project on a 3-story brownstone takes 1–3 weeks on-site. Full facade restoration including LPC approval can take 2–6 months total (mostly waiting on LPC), with the actual construction portion taking 3–8 weeks depending on scope.
Yes. In-kind repairs — repointing with matching mortar, patching with matching stone — typically require only a Certificate of No Effect from LPC, which is often approved the same day. We identify what approval level your project needs and handle all filings.
Repointing refers to removing old mortar and applying fresh mortar to joints. Tuckpointing is a specific finishing technique using two different mortar colors — a base mortar color matching the brick, with a thin line of contrasting mortar in the center. Both are offered by Keystone Restorations.
Call today for a free, no-pressure facade assessment. We'll tell you exactly what your building needs, what it will cost, and what permits are required — before you commit to anything.
646-919-4496Keystone Brownstone Restoration Contractors & Brick Pointing NYC
Serving Manhattan · Brooklyn · Queens · Bronx · Staten Island
Licensed & Insured · LPC Landmark Specialists · Free Estimates