NYC's LPC-Approved Window Restoration Contractor

Preserving the Soul of Brownstone & Landmark Architecture

Historic window restoration, brownstone window replacement & stained glass repair across Brooklyn, Manhattan, Queens & The Bronx — LPC-approved, factory-trained, for over 17 years.

Request a Free Assessment → View Our Work
17+Years
100+Clients
80+Heritage Sites
36K+NYC Landmarks
HM Historical Conservation artisans restoring a leaded glass panel in the Newark workshop
17+Years of Craft

Our Story

A workshop built on reverence for old glass.

Founded by master craftsman Henrique Lima, HM Historical Conservation has spent more than 17 years restoring the windows that give New York's landmark buildings their character. From our Newark workshop, factory-trained artisans return historic sash, leaded panels, and stained glass to their original integrity — pane by pane, joint by joint.

Our work includes more than 70 windows at The Dorilton, one of Manhattan's most ornate Beaux-Arts landmarks, and the painstaking re-creation of curved glass for a Brooklyn Heights brownstone. Every project honors the original maker's intent while meeting today's preservation standards.

LPC Approved EPA Lead-Safe Landmarks Preservation Historic Window Specialist Brownstone Restoration

What We Restore

Specialized restoration for windows history can't replace.

Four disciplines, one standard of care — every commission handled by factory-trained artisans to LPC and EPA Lead-Safe practices.

Restored cathedral stained glass window with releaded came
01

Stained Glass & Leaded Windows

Repair, releading, and conservation of stained and leaded glass — from heraldic panels to cathedral figurative work. Bowed panels straightened, came rebuilt, and historic glass matched and re-set by hand.

Restored historic arched wood sash window in a NYC landmark building
02

Historic Wood & Metal Window Restoration & Replacement

Double-hung sash, steel and bronze casements restored to full operation — epoxy consolidation, weatherization, and historically accurate replacement where original units are beyond saving.

Detail of restored period painted glass
03

Dalle de Verre

Restoration of mid-century slab-glass-and-concrete (and epoxy) windows — re-setting faceted dalles, repairing the matrix, and conserving these bold modern liturgical works.

Lead-safe restoration of a historic leaded window panel in the workshop
04

Lead Paint Abatement

EPA Lead-Safe certified removal and stabilization of lead paint on historic windows and frames — protecting occupants while preserving original material and profiles.

New Window Installation

When replacement is the right call, only landmark-grade windows.

For windows beyond restoration, we install historically faithful units from the manufacturers trusted on landmark projects — specified, sourced, and installed to LPC standards.

Historic Replacement Line

True divided lites, authentic sightlines, and made-to-order profiles that satisfy Landmarks review while delivering modern thermal performance for occupied buildings.

Explore Marvin Historic
Historical Double Hung

Architecturally accurate double-hung windows engineered for landmark districts — period-correct meeting rails, putty profiles, and hardware for seamless replacement.

Explore Norwood
Mahogany · Custom

Solid mahogany, fully custom windows and doors for the most demanding restorations — bespoke joinery matched to the original architecture, grain, and detail.

Explore Caoba

Working in a Landmark Building?

We manage the full LPC process — start to finish.

Restoring windows in a designated landmark or historic district means navigating the Landmarks Preservation Commission. We handle every step so your board, architect, or property manager doesn't have to.

Start Your Landmark Project →
01

Certificate of Appropriateness

Preparing and filing the CofA application LPC requires before landmark work begins.

02

Documentation

Existing-conditions surveys, photographic records, and historically accurate specifications.

03

LPC Liaison

Direct coordination with Landmarks staff and reviewers through approval.

04

Workshop Fabrication

Restoration and replication carried out to the approved scope in our Newark shop.

05

Compliance

Work performed to LPC and EPA Lead-Safe standards, fully documented throughout.

06

Final Sign-Off

Closeout records and confirmation that completed work matches the approved application.

Our Work

A portfolio measured in centuries.

Real HM projects across New York's most significant buildings. Hover any piece to read the work.

Palladian arch window restoration, Manhattan landmark building
Palladian Arch WindowRestoration · Manhattan
Heraldic leaded glass medallion releading, Brooklyn
Heraldic Leaded GlassReleading · Brooklyn
Cathedral stained glass conservation, NYC
Cathedral Stained GlassConservation
Gothic figurative stained glass panel restoration
Gothic Figurative PanelRestoration
Period painted glass conservation detail
Period Painted GlassConservation
Leaded glass panel re-set after workshop restoration, Queens
Leaded Panel ReinstallRe-set · Queens
Restored brownstone wood sash window, Brooklyn
Restored Brownstone SashWood Restoration · Brooklyn

From Assessment to Completion

Four steps, fully managed.

A clear path from first visit to certified install — with you informed at every stage.

STEP 01

Free Site Assessment

We visit, evaluate every window's condition, and recommend restoration or replacement — no obligation.

STEP 02

LPC Documentation & Approval

For landmark work, we document conditions and secure the Certificate of Appropriateness.

STEP 03

Workshop Fabrication

Restoration and replication carried out by hand in our Newark workshop to the approved scope.

STEP 04

Certified Installation

Factory-trained, lead-safe installation on site — with closeout documentation for your records.

Testimonials

Trusted by the boards and architects who steward landmarks.

HM's craftsmanship on our windows was extraordinary. They understood the building's history and treated every detail with the care a landmark deserves.

Robert A.Board, The Dorilton

Professional, meticulous, and completely fluent in the LPC process. The restored windows look exactly as they should — original, but renewed.

Hugo M.The Adler

As architects we hold our trades to a high standard. HM delivered preservation work of genuine quality and managed the approvals seamlessly.

Glenn D.DOPF Architects

Where We Work

Restoring windows across all five boroughs.

From Beaux-Arts apartment houses to brownstone rows, we serve New York City's historic districts.

Manhattan

Historic Districts
  • Upper West Side / CPW
  • Greenwich Village
  • Harlem & Hamilton Heights
  • Murray Hill
  • Ladies' Mile

Brooklyn

Historic Districts
  • Brooklyn Heights
  • Park Slope
  • Fort Greene & Clinton Hill
  • Cobble Hill / Carroll Gardens
  • Bedford-Stuyvesant

Queens

Historic Districts
  • Jackson Heights
  • Sunnyside Gardens
  • Douglaston
  • Ridgewood
  • Forest Hills Gardens

The Bronx

Historic Districts
  • Riverdale
  • Mott Haven
  • Longwood
  • Grand Concourse
  • Morris Heights

Get a Free Assessment

Let's preserve your windows.

Tell us about your building and project. We'll schedule a complimentary on-site assessment and walk you through the options — restoration, replacement, and landmark approvals.

Phone(929) 725-2452
Emailinfo@hmconservationNY.com
WorkshopNewark, NJ — by appointment

Aria — our project intake specialist — personally reviews every assessment request and will follow up to coordinate your visit.

By submitting you agree to be contacted about your project. No cost, no obligation.

Thank you — your request has reached our intake team. Aria will follow up shortly to coordinate your complimentary assessment.