Best Time of Year to Replace Windows in Scottsdale and Paradise Valley

Short answer: in Scottsdale and Paradise Valley, the most comfortable months to have windows installed are October through April, when Phoenix-area average highs run from the mid-60s to the high 80s and 100-degree days are rare. The month that matters most for your power bill is before May: that's when APS's summer billing season begins and triple-digit days start stacking up. So the practical plan for most homes is to start in fall or winter, get HOA approval and the permit while the windows are being made, and have them in before the heat. Summer installs are still possible. Dealers work year-round, and state law allows permitted work to start at 5 a.m. on summer weekdays. Ask the right questions about heat, sealants and monsoon storms first.

Month by month: what the weather and the rules say

The temperatures below are NOAA's official 1991-2020 climate normals for Phoenix Sky Harbor, the long-term station closest to Scottsdale and Paradise Valley. Your own street can run a few degrees different, especially up in the north Scottsdale foothills.

Sources: NOAA NCEI climate normals; the National Weather Service Phoenix office's monsoon page ("our monsoon season officially extends from June 15th through September 30th"); APS's service plan FAQs, which call November through April bills the winter months; and the city and Town construction-hour rules covered below.

Season by season

Fall (October and November)

Average highs drop from 89°F in October to 76°F in November, and the monsoon season is officially over after September 30. It's comfortable weather for crews and for you while openings are exposed. Fall is also the right time to start a project you want finished before next summer: measurements, HOA submittal and permits can all happen while the weather is mild.

Winter (December through February)

Phoenix-area winter highs average 66°F to 71°F, and NOAA's normals show freezing nights are rare at the airport station (less than one a year on average). The trade-offs are shorter days and shorter legal work hours. Scottsdale's winter construction hours (October 16 to April 30) are 7 a.m. to 5 p.m. on weekdays and 8 a.m. to 5 p.m. on Saturdays, with no Sunday work, per the city's legislative updates page. A big multi-slide opening may take more days in winter simply because the workday is shorter.

Spring (March through May)

March and April are the last mild months, averaging 78°F and 86°F. May is a turning point: average highs hit 94.5°F with about nine 100-degree days, and APS's summer billing season starts with the May bill. If you want to cut this summer's cooling bills, plan to have the windows in by the end of April, which means ordering earlier. Work backward using the timeline below.

Summer (June through September)

This is the hardest stretch. NOAA's normals average 18 to 29 days a month at 100°F or higher from June through September, and the NWS monsoon season runs June 15 to September 30, with sudden wind, dust and rain. Summer installs still happen, especially when a window or slider has failed. Two rules help:

• Early starts are legal. Arizona law (A.R.S. 9-500.52) says cities can't stop general construction from 5 a.m. to 7 p.m. on weekdays and 7 a.m. to 7 p.m. on Saturdays between May 1 and October 15, as long as the work is under a valid building permit. Scottsdale and Paradise Valley both list these summer hours.
• Paint and stucco touch-ups need shade. Full-frame replacements usually mean some stucco patching and paint. Dunn-Edwards' hot-weather painting guidance says to avoid having more than two or three of these at once: temperatures above 95°F, direct sun, a hot surface, a very porous surface, and wind. It recommends "chasing the shade" and painting early in the morning.

If you're a seasonal resident, summer is also when your house is empty. See our snowbird planning guide for scheduling work while you're away.

Work backward from the date you want

Weather is only half of timing. The other half is paperwork and manufacturing, and they run in this order:

1. Measure and spec (week 1 or 2). A dealer measures, recommends the product and glass, and gives you a written quote with cut sheets you can use for your HOA.
2. HOA review. Published review times vary. McDowell Mountain Ranch decides within 45 days of a complete submittal. Windgate Ranch aims to finish review within 45 days. DC Ranch responds within 30 days, plus up to 10 working days of Covenant Commission review. Grayhawk's committee meets the first and third Tuesday and answers in writing within two weeks of the review. Gainey Ranch needs two committees to approve.
3. City or Town permit. In Scottsdale, a same-size window replacement uses a Minimum Window/Door Permit with no plan review. A widened or new opening needs a building permit; the city's residential plan review targets are 7 business days administrative plus 15 business days substantive. In Paradise Valley, every building permit gets a plan review of up to 15 business days per round, plus 3 to 5 business days to issue it, and hillside lots may need Hillside Building Committee review first. Details are in our permit guide.
4. Order and manufacturing. Most dealers won't order until HOA approval and the permit are in hand. Ask for the current lead time in writing; it varies by manufacturer, product and season, and custom sizes and big multi-slide doors usually take longer than stock windows.
5. Install. Ask how many days your scope takes and how many openings will be open at once.

Don't apply too early, either. Approvals expire. Grayhawk approvals are valid for 90 days, McDowell Mountain Ranch gives you 60 days to finish approved work, and Windgate Ranch gives six months, each unless the committee agrees otherwise. A Scottsdale or Paradise Valley permit needs an inspection within 180 days. Line up the submittal with the order so nothing lapses while you wait for glass.

What changed for 2026: no tax-credit deadline

In past years, some homeowners rushed to finish windows by December 31 to claim the federal Energy Efficient Home Improvement Credit. That credit is gone for new work. The IRS says the Section 25C credit won't be allowed for any property placed in service after December 31, 2025. So in 2026 there's no year-end tax reason to rush; schedule around the weather and your HOA instead. (Ask your tax professional about your own return.)

A quick timing checklist

• Pick a target "windows in" date (before May if summer comfort and cooling bills are the goal).
• Get your HOA's current design guidelines and submittal form, and note its meeting dates and review time.
• Ask the dealer for the manufacturer's current lead time in writing.
• Confirm the permit type (Scottsdale Minimum Window/Door Permit vs. building permit; Paradise Valley plan review and possible hillside or demolition permit).
• Check how long your HOA approval and permit stay valid.
• If the install lands between June 15 and September 30, agree on a monsoon plan.
• If your home was built before 1978, confirm the firm is EPA lead-safe certified (EPA RRP).

Questions to ask a dealer about timing

1. What's the manufacturer's current lead time for my exact products, and when does the clock start: at signing, at HOA approval, or at permit?
2. Will you prepare the HOA submittal package and apply for the permit, and how long do you plan for each?
3. How many days will my install take, and how many openings will be open at one time?
4. If it's summer: what time does the crew start, which sealant do you use, and is today's temperature inside that sealant's application range?
5. What happens if a monsoon storm or dust storm is forecast on install day?
6. Who handles stucco and paint touch-up, and will it be done in shade or in cooler hours?
7. If my HOA approval or permit is close to expiring, who handles the extension?

Get matched with a dealer for the season you want

Lux Views Co. is a free referral service, not a contractor. Fill out the short form below with the month you'd like the work done, and we'll match you with licensed independent dealers who serve Scottsdale and Paradise Valley. For product choices, see the best windows for Arizona heat, how long windows last in Arizona, and our window replacement and energy-efficient windows pages.

Weather figures are NOAA 1991-2020 normals for Phoenix Sky Harbor and are long-term averages, not forecasts. Construction hours, permit steps and HOA timelines are from official City of Scottsdale, Town of Paradise Valley, State of Arizona and HOA sources as of October 23, 2026; they can change, so confirm with the city or Town and your HOA. Not tax or legal advice.