Replacement planning, step by step
Replacing windows in Philadelphia: plan it before you get quotes
Window replacement is a bigger decision than repair. This planner walks through the choices that change the price and the result, then connects you with a local window installer when you are ready.
Which describes your house?
Older brick rowhouses often have double-hung wood windows in openings that are still square. Insert (pocket) replacement keeps the existing frame and casing and is common here. If the frame itself is rotted, full-frame replacement is the better path. Check the block for historic rules first.
West Philadelphia style twins and porch-front houses tend to have tall, heavy windows and often bays. Custom sizes are common, so expect measuring visits, and ask whether the installer has handled bay and bow units.
Many Northeast Philadelphia homes date from the mid-twentieth century and carry aluminum, steel or older vinyl windows. Full-frame or insert replacement can both work; condition of the frame and sill decides which.
Stone houses in Mount Airy, Germantown and Chestnut Hill have deep openings and wood frames set in thick walls. Replacements need careful flashing and trim, and many stone houses are in historic districts.
Newer buildings usually have windows with sealed glass units. Replacement may mean replacing a failed glass unit only. Condo owners should check association rules before ordering anything.
Repair keeps what you have, and replacement swaps it. Neither is automatically better. The table lists the situations that usually point each way.
| Situation | Repair usually fits | Replacement usually fits |
|---|---|---|
| Sash will not open or stay up | Cords, paint and stops can be fixed | Frames have moved or sash have racked badly |
| Drafts and cold rooms | Weatherstripping and storm windows | Many failed seals or no repairable parts |
| Rot | Small areas at a sill | Rot through rails, sills and frames |
| Fogged glass between panes | Replace only the sealed unit | Several failed units or an unsupported product |
| Historic district | Often the easier approval | Possible, but review and matching rules apply |
Insert (pocket) replacement
A new window is fitted inside the existing frame. The trim and plaster stay, work is quicker, and the glass area is slightly smaller. Works when the old frame is sound and square.
Full-frame replacement
The old window is removed down to the rough opening, so the frame, flashing and insulation can be redone. More work and more cost, but it fixes hidden water damage and allows a larger glass area.
- Permits
- Philadelphia's Department of Licenses and Inspections (L&I) issues building permits. Replacement that keeps the same opening is treated differently from work that changes openings or structure, so ask your installer which applies and confirm with L&I.
- Historic review
- The Philadelphia Historical Commission reviews exterior work visible from the street on properties on the Philadelphia Register of Historic Places, and may require replacement windows to match the original look.
- Energy code zone
- Philadelphia is in climate zone 4A of the International Energy Conservation Code. The energy code and the NFRC label on the window help you compare products, and installers should be able to show the rating of the model they quote.
- Lead paint
- In a house built before 1978, window removal can disturb lead paint. EPA's Renovation, Repair and Painting rule calls for certified firms using lead-safe practices.
- Safety rules
- The state building code requires bedroom windows to meet emergency escape sizes and requires safety glass in certain spots such as near doors and tubs. A good installer checks these before ordering.
- Send your requestName, ZIP code and a phone number or email are required. Add the number of windows and the house type if you can.
- Expect a measuring visitAn installer may visit to measure openings and check the frames. Windows are made to measure, so this step matters.
- Compare written estimatesAsk each estimate to list product, glass package, trim, disposal and who handles permits and lead-safe work.
- Decide at your paceYou are not obligated to hire anyone who contacts you, and this site does not do the work.
How long does window replacement take?
Made-to-measure windows are ordered after measuring, and lead times vary by product and installer. Ask for the order lead time and the install schedule in writing. Many installers can do a typical rowhouse in a day or two once the windows arrive.
Do I need a permit to replace windows in Philadelphia?
It depends on the scope. Like-for-like replacement in the same opening is treated differently from changing openings. Properties on the Philadelphia Register of Historic Places have additional review. Confirm with L&I and the Historical Commission.
Is replacement worth it for energy savings?
It can help, but air sealing, insulation and repairs also matter, and savings vary by house. Ask installers to explain what they expect and what it is based on, and be wary of precise savings promises.
Does this site install windows?
No. It is an information site that connects homeowners with a local window installer. It is not a contractor.