When Is the Best Time of Year to Fit a Cat Flap in the UK?
Short Answer
Late spring (April–May) and early autumn (September–October) are the best UK windows. Weather is dry enough for clean glass and silicone work, daylight is long, cats adapt fastest, and installer lead times are shorter than peak summer.
Spring (March–May)
Pros: Mild weather, dry days, cats spend more time outside so flap training is faster. Garden activity (birds, neighbouring cats) gives a strong motivation to learn the flap. Lead times reasonable until late May.
Cons: Mid-May onwards installer diaries fill rapidly. Pollen season can be bad for some cats but isn't flap-related.
Verdict: Excellent. Book in March or early April.
Summer (June–August)
Pros: Cats are highly motivated to use a new flap. Training is easy. Glass-door work benefits from long dry weather (silicone cures fast).
Cons: Longest lead times of the year — frequently 3–5 weeks in our area. Heatwaves make uPVC doors expand slightly, which is irrelevant for fitting but means cats sometimes find new flaps stiffer at first.
Verdict: Good, if you book early. Don't expect a next-week slot in July.
Autumn (September–October)
Pros: Demand drops slightly so lead times shorten. Weather still mild and dry. Crucially, you get the flap fitted before winter storms so seals and silicone settle in dry conditions, and your cat learns the flap before cold weather makes them reluctant.
Cons: Late October can bring heavy rain making outdoor glass work slower.
Verdict: Best window of the year. Book in August for September fitting.
Winter (November–February)
Pros: Shortest lead times — usually within 1–2 weeks. Quieter installer diaries. Your cat will appreciate the flap most when bad weather hits.
Cons: Silicone cures slowly below 5 °C (we use cold-weather formulations, but it's slower). Heavy rain or snow can delay glass deliveries from factory. Cats are less keen to *learn* a flap in dark, cold conditions — training may take longer.
Verdict: Fine for emergency fits or when you've waited too long, but spring/autumn are better if you have a choice. We do fit through winter — see our services.
What About Holiday Periods?
Christmas / New Year: we stand down between 22nd December and 2nd January. Book in November if you want pre-Christmas fitting.
Easter: popular for spring fittings — book 2–3 weeks ahead.
Summer school holidays: very busy. Book 3–4 weeks ahead.
Half-terms: mid-week slots fill fast with parents at home.
Match the Season to Your Cat
New kitten arriving in spring: wait until they're old enough for outdoor access (~6 months), so fit late summer / early autumn.
New rescue cat: fit *before* their 4–6 week indoor settling period ends, so the flap is in place when they're ready. See introducing a rescue cat to a cat flap.
Senior cat with arthritis: fit before winter so they don't have to learn a new flap in cold weather.
Moving house: fit within 2–3 weeks of moving so the flap is part of their initial map of the new home.
Lead Times by Season
Approximate lead times from quote to install in our area:
• Jan–Feb: 1–2 weeks
• Mar–Apr: 1–2 weeks (rising)
• May–Aug: 3–5 weeks
• Sep–Oct: 1–3 weeks
• Nov–Dec: 1–2 weeks
Glass-door installs add a 7–10 working day glass factory lead time on top.
Ready to book? Request a quote — we'll confirm current availability for your area.
