Window Replacement in Washington, DC

In Washington, DC, replacing windows needs a building permit from the Department of Buildings (DOB). DOB's Homeowner's Center lists "Window/Door Replacement/Repair" among the jobs it handles, and for a one- or two-family home, in-kind replacement of up to 15 windows can go through an online Instant Permit (DOB Homeowner's Center) ¹². The Department of Licensing and Consumer Protection (DLCP) says home improvement contractors are legally required to hold a Home Improvement Contractor (HIC) license, which you can check before you sign (DLCP homeowner tips) ⁶.

What sets DC apart is historic review. For a landmark or a house in a historic district, a window permit is reviewed by the Historic Preservation Office (HPO) under detailed window standards: on front elevations, new windows should replicate the historic ones, and vinyl is described as not appropriate (Window Repair and Replacement guidelines) ⁴. The District is in ENERGY STAR's North-Central climate zone ⁸.

Do you need a permit to replace windows in DC?

Yes, according to the District's own guidance. The HPO's window guidelines say "replacing windows requires a DC building permit from the Department of Buildings (DOB)," and the Office of Planning lists window replacement among work that needs a permit (Window Repair and Replacement guidelines) ³⁴. The same guidelines list repairs that do not need a permit: replacing glass or glazing compound, repairing wood damage, painting, weather-stripping and installing storm windows, and window screens and security bars as long as no permanent alteration is made to the window or opening ⁴.

Two routes, from DOB's pages:

• Instant Permit. For one- and two-family homes, DOB allows an Instant Permit to "replace in kind of up to 15 windows," with in kind meaning a unit that "matches the original in look, feel, material, design, detail, location, and size." DOB says building Instant Permits can be obtained by the property owner, and its apply links go to the Citizen Access portal (Instant Permits) ².
• Standard permit. Work outside those scopes, such as changing the size or material, goes through a regular building permit. The Homeowner's Center, at 1100 4th Street SW, reviews window and door replacement for "any homeowner of a one or two-family home, or agent on the homeowner's behalf with written authorization," and takes calls at (202) 671-3500 (Homeowner's Center) ¹.

Historic properties are the exception to the quick route. DOB says that in a historic or CFA (Commission of Fine Arts) jurisdiction "you must get approval before you apply for a permit" and points historic properties to a Historic Property Special Permit; the Office of Planning adds that postcard permits cannot be used on a historic property ¹²³. The article on whether you need a permit to replace windows covers how this differs elsewhere.

Who may do the work

The District licenses home improvement contractors through DLCP. DLCP says "all home improvement contractors are legally required to have a Home Improvement Contractor (HIC) and a Home Improvement Salesperson (HIS) License (or a designated salesperson)," and its homeowner tips point to SCOUT to verify a contractor's license (DLCP homeowner tips) ⁶. DLCP's contractor page lists what an HIC applicant files, including a certificate of liability insurance, a home improvement contract, a police criminal history report and a surety bond, with licenses issued for two or four years (DLCP Contractor and Construction Services) ⁵. The same tips suggest a phased payment timeline, with an initial deposit and later payments tied to completion deadlines ⁶.

Electrical, plumbing and mechanical work is separate: DOB says trade permits go only to master trade professionals, and homeowners cannot apply for them ¹.

Questions to ask each installer:

• What is the company's HIC license number, and does it show as active on SCOUT?
• Who files the permit, and is HPO review included in the timeline?
• If the house is historic, can the company supply the drawings and spec sheet HPO asks for?

The guide on how to choose a window installer covers the rest of the vetting.

Historic districts: DC's window guidelines

The Office of Planning says HPO clearance of the building permit application is the preservation approval, with no separate preservation permit, for work affecting the exterior of a historic property (Building Permits for Historic Property) ³. DOB forwards window applications for historic properties to HPO, which reviews them under the Historic Preservation Review Board's regulations (DCMR 10-C, Chapter 23) and its guidelines ⁴. The main points of the Window Repair and Replacement guidelines ⁴:

• Repair first. Historic windows on primary elevations "should be repaired unless it can be documented that repair is not a reasonable option" ⁴.
• Front elevations. Replacements should fit the original openings and replicate the pane configuration, the dimensions and profiles of sash, frame and muntins, and the finish ⁴.
• Materials. Painted wood is called the most appropriate choice for houses; fiberglass, wood composite, metal and metal-clad windows may be acceptable if they replicate wood's appearance; vinyl windows "are not appropriate replacements" on primary elevations of historic property ⁴.
• Glass and muntins. Double glazing is allowed; muntins should be integral with an exterior profile, and between-the-glass or removable muntins are not appropriate. Low-E glass is acceptable if it looks like clear glass ⁴.
• Secondary elevations. Replacements on secondary elevations visible from a street should fit their openings and match the general characteristics of the originals, without precise replication; rear, courtyard and utilitarian windows get more flexibility ⁴.
• Installation method. Insert (pocket) replacement, which often thickens the frame and shrinks the glass, "is not encouraged" unless it can be documented that the appearance will not change ⁴.

An application needs photographs of the existing windows, a measured drawing of existing and proposed windows (not needed when only sashes are replaced), and a manufacturer's spec sheet. Properties with a preservation easement need the easement holder's written approval before applying, and HPO takes questions at [email protected] ⁴. See also our article on replacing windows in a historic home and the one on storm windows, which HPO notes need no permit ⁴.

DC's climate and what it means for the glass

ENERGY STAR places the District of Columbia in its North-Central climate zone (ENERGY STAR climate zone finder) ⁸. There, the Version 7.0 criteria call for a U-factor of 0.25 or less and a solar heat gain coefficient (SHGC) of 0.40 or less, with an air leakage limit of 0.3 cubic feet per minute per square foot (ENERGY STAR criteria) ⁷.

NOAA's 1991-2020 normals for Reagan National Airport show both seasons count: about 60 days a year with a low of 32°F or colder and an average winter low of 32.1°F, and about 40 days a year at 90°F or more with an average summer high of 87.5°F (NOAA climate normals) ⁹. Normal annual precipitation is 41.82 inches, with 13.7 inches of snow ⁹.

Ask each installer for the NFRC-rated U-factor and SHGC of the exact unit quoted. The energy-efficient windows explainer and the article on U-factor explain the ratings.

What window replacement costs

This article does not give a DC price, because the cost surveys it relies on report national figures. As a national reference, Fixr reports an average of about $800 per window, typically $450 to $1,200 (updated January 21, 2026) ¹⁰. The window replacement cost guide sets several national surveys side by side.

Getting quotes in Washington, DC

Get two or three written quotes that name the brand and series, the glass ratings, full-frame, insert or sash-only installation, and who handles the permit and any HPO review. The article on how to compare window quotes shows how to line them up. When you are ready, you can compare quotes from window installers in the DC area.

About these figures

• ¹ Official record: DC Department of Buildings Homeowner's Center page (window and door replacement, historic and CFA approval before applying, who may apply, trade permits, address and (202) 671-3500), checked October 27, 2026.
• ² Official record: DOB Instant Permits page (in-kind replacement of up to 15 windows for one- and two-family homes, owner may obtain, Historic Property Special Permit), checked October 27, 2026.
• ³ Official record: Office of Planning Building Permits for Historic Property page (permit needed for window replacement, HPO clearance as preservation approval, no postcard permits), checked October 27, 2026.
• ⁴ Official record: HPRB Window Repair and Replacement Preservation and Design Guidelines (permit rule, repair exemptions, standards, DCMR 10-C Chapter 23, application contents, easements), checked October 27, 2026.
• ⁵ Official record: DLCP Contractor and Construction Services page (HIC application items including insurance and a surety bond, two- and four-year terms), checked October 27, 2026.
• ⁶ Official record: DLCP homeowner tips release of May 21, 2026 (HIC and HIS license requirement, SCOUT verification, phased payments), checked October 27, 2026.
• ⁷ Official record: ENERGY STAR Version 7.0 residential window criteria (North-Central U-factor 0.25 and SHGC 0.40; air leakage 0.3 cfm per square foot), checked October 27, 2026.
• ⁸ Official record: ENERGY STAR county climate zone list (District of Columbia in the North-Central zone), checked October 27, 2026.
• ⁹ Official record: NOAA 1991-2020 climate normals for Reagan National Airport (about 60 days at 32°F or below, winter average low 32.1°F, about 40 days at 90°F or more, summer average high 87.5°F, 41.82 inches of precipitation, 13.7 inches of snow), checked October 27, 2026.
• ¹⁰ Reported: Fixr national window replacement cost (about $800 per window, typically $450 to $1,200; updated January 21, 2026), checked October 27, 2026.