Window Replacement in Pennsylvania: HICPA Registration and Glass

In Pennsylvania, the Home Improvement Consumer Protection Act (HICPA) requires contractors who do at least $5,000 of home improvement work a year to register with the Office of Attorney General, and the Act's definition of home improvement names doors and windows (Attorney General registration page; HICPA text; registration search) ¹²³. Registration is a record that the contractor filed, not a judgment of skill: the Attorney General's page says registration is not an endorsement, recommendation or approval of a contractor's competency ¹.

The other half of the picture is climate. Philadelphia, Harrisburg, Lancaster and the rest of the southeast sit in ENERGY STAR's North-Central zone, while Pittsburgh, Erie, Scranton, State College and 53 of the state's 67 counties sit in the Northern zone, where the criteria set the lowest U-factor limit ⁴⁵.

HICPA registration: what it covers

The Act is short and readable. Three parts matter most for a window job (HICPA, 73 P.S. 517.1 et seq.) ²:

• Who must register. No person may hold themselves out as a contractor or perform a home improvement without first registering with the Attorney General's Bureau of Consumer Protection (section 517.3). The definition of contractor leaves out a person whose home improvements totaled less than $5,000 in the previous taxable year (section 517.2) ².
• What counts as home improvement. Work on a private residence where the total cash price agreed is more than $500, including the replacement or installation of doors and windows, and, regardless of how they attach, storm windows (section 517.2) ². Building a new home is not included ².
• The number on the paperwork. A registered contractor must include its registration number in all advertisements in Pennsylvania and on all contracts, estimates and proposals with owners (section 517.6) ². Approved registrants receive a Pennsylvania Home Improvement Contractor number, shown as "PA#" ¹.

The Attorney General's page describes this as registration and says an "Approved" status means the information on the application appears to be accurate (registration page) ¹.

How to check a registration

The Attorney General's Home Improvement Contractor Search looks up a contractor by registration number, business name, primary applicant, address or city ³. Before you sign:

• Is the PA# on the quote the same one the search shows for that business ²³?
• Does the business name on the search result match the name on the contract?
• Is the installer registered under HICPA, and how long has the business been operating under that name?

The guide on how to choose a window installer covers references, warranties and the rest of the vetting.

What a Pennsylvania window contract must contain

HICPA section 517.7 says a home improvement contract is not valid or enforceable against the owner unless it meets a list of requirements (HICPA text) ². The ones that matter most on a window quote:

• It is in writing, legible, and shows the contractor's registration number ².
• It is signed by the owner and by the contractor or its salesperson, and it carries the date ².
• It lists the contractor's name, address and telephone number; a post office box alone does not count as an address ².
• It gives the approximate start and completion dates ².
• It describes the work, the materials and a set of specifications that cannot change without a written change order signed by both sides ².
• It states the total price, or, for a time-and-materials job, an initial written estimate that the cost may not exceed by more than 10% without a signed change order ².
• It lists the down payment and any special-order materials separately, and names the subcontractors known at signing ².
• It includes a notice of the right to rescind ².

That right is set out in section 517.7(b) (HICPA text): the person who signs may rescind the contract without penalty within three business days of signing, wherever it was signed, apart from the emergency-work exception the section names ².

Section 517.9 adds limits on money up front (HICPA text). A contractor may not demand or receive payment before the contract is signed, and on a contract of more than $5,000 may not take a deposit of more than one-third of the price, or one-third plus the cost of special-order materials named in the contract, with an exception for home improvement retailers that meet conditions the section sets out ². If a quote includes windows ordered to measure, check how it lists them.

The article on how to compare window quotes gives a line-by-line template that lines up with this list.

Pennsylvania climate zones for windows

ENERGY STAR sets window criteria by climate zone, based on ratings from the National Fenestration Rating Council (NFRC) ⁶. Pennsylvania's 67 counties fall into two zones (ENERGY STAR climate zone finder) ⁵:

The North-Central list is completed by Franklin, Lebanon and Perry counties ⁵. Every ENERGY STAR window must also meet an air leakage limit of 0.3 cubic feet per minute per square foot ⁴. In the Northern zone, the criteria also accept slightly higher U-factors of 0.23 to 0.26 when they come with a higher SHGC, 0.35 or more for 0.23 and 0.24, and 0.40 or more for 0.25 and 0.26 ⁴.

What the numbers mean in a heating climate

U-factor measures how fast heat moves through the whole window, frame included. A lower number insulates better. The Northern zone asks for 0.22 or less, the lowest U-factor limit in the ENERGY STAR table ⁴.

SHGC (solar heat gain coefficient) is the share of the sun's heat that comes through the glass. In the Northern zone the criteria set a minimum, not a maximum: 0.17 or more ⁴. Winter sun through south-facing glass can add heat, which is one reason the zone has no SHGC cap like the southern zones.

The two zones meet inside the state. Lehigh and Northampton counties (Allentown, Bethlehem) are Northern, while neighboring Berks and Bucks are North-Central ⁵. Check your own county in the finder rather than assuming a whole region shares one zone.

Questions for a cold-climate quote

• What are the NFRC-rated U-factor and SHGC of the exact window quoted, and do they meet ENERGY STAR's criteria for your county's zone?
• Is the glass double or triple pane, and which low-E coating does it use? The articles on low-E glass and triple-pane windows explain the trade-offs.
• How will the installer insulate and seal the gap between the new frame and the wall opening?
• If an older house has interior condensation now, what does the installer think is causing it? The window condensation article explains why it happens.

The energy-efficient windows explainer covers the ratings in more depth.

Cost, permits and next steps

Pennsylvania prices follow the same drivers as anywhere: the number of windows, frame material, glass package, full-frame or insert installation, and labor. This article does not quote Pennsylvania or city prices. The window replacement cost guide sets the national surveys side by side.

Whether a window job needs a building permit depends on the municipality, and the article on window replacement permits explains why the answer varies. Ask the installer who will pull any permit and whether its cost is in the quote.

When you are ready, you can compare quotes from window installers.

About these figures

• ¹ Official record: Pennsylvania Attorney General registration page (registration for contractors doing at least $5,000 of home improvements a year, the PA# number, and the statement that registration is not an endorsement and that "Approved" means the application appears accurate), checked October 26, 2026.
• ² Official record: Home Improvement Consumer Protection Act text published by the Attorney General (sections 517.2, 517.3, 517.6, 517.7 and 517.9: the $5,000 and $500 thresholds, doors and windows in the definition, contract contents, the 10% time-and-materials limit, the three-business-day right of rescission, and the one-third deposit limit), checked October 26, 2026.
• ³ Official record: Attorney General Home Improvement Contractor Search (search fields), checked October 26, 2026.
• ⁴ Official record: ENERGY STAR Version 7.0 window criteria for the Northern and North-Central zones, including the equivalent-performance options and air leakage 0.3, checked October 26, 2026.
• ⁵ Official record: ENERGY STAR county climate zone spreadsheet for Pennsylvania (67 counties: 14 North-Central, 53 Northern), checked October 26, 2026.
• ⁶ Official record: ENERGY STAR statement that window criteria rest on NFRC ratings and vary by climate zone, checked October 26, 2026.