How often should I have my windows cleaned? UK 2026 guide

The honest answer for most UK homes in 2026 is every four weeks between March and October, every six to eight weeks between November and February. From the rounds we’ve talked to, this is the cadence most working operators recommend and most customers settle on once they’ve tried a couple. The full reasoning below covers why, what changes between schedules, and the specific property types where a different cadence is better.

I run a small window-cleaning round in the East of England and I built quoting software other UK operators use. Everything below comes from working visits and from talking to dozens of operators who run rounds across the country.

What actually happens to glass between cleans

Modern UK exterior glass picks up dirt from roughly six sources, in rough order of impact: airborne road dust (especially within 200 metres of any A or B road), pollen and tree sap (April through July), bird droppings (year-round, worse near garden bird feeders), water spotting from sprinkler systems and rain (year-round), salt spray (within 8 kilometres of the coast), and exhaust soot (within 50 metres of any garage forecourt or busy junction).

These accumulate non-linearly. The first ten days after a clean, glass looks visibly identical. Days 10 to 20, a thin film of airborne dust starts to settle but it's only visible under raking light at dawn or dusk. Days 20 to 35, the film thickens and starts being visible in normal daylight from the inside of the property looking out. Days 35 to 50, exterior viewers (you, walking up to your front door, neighbours) start to notice. Days 50 to 90, the windows look unmistakably dirty and the customer starts thinking they need attention.

The four-week schedule keeps glass in the days-10-to-20 invisible-film zone permanently. The eight-week schedule lets it drift into the days-20-to-50 noticeable-from-inside zone briefly before each clean. The twelve-week schedule means the glass is visibly dirty for the last fortnight of each cycle.

The three schedules in use across UK residential rounds

Monthly (every four weeks). The dominant choice for about 60% of UK recurring residential customers in 2026. Suits properties with high dirt exposure: anything on a main road, anything within 8 km of the coast, anything in central urban areas, anything with mature trees overhanging the property. Also chosen by customers who simply want their windows to always look clean (aesthetic preference, no specific exposure problem). Cost: standard monthly rate · for a three-bed semi, £30 to £48 a month in most of the UK.

Bi-monthly (every eight weeks). About 25% of customers. Suits properties with low street-side weathering · cul-de-sac houses, set-back homes, suburban estates more than 500 metres from any main road. Customers who notice dirt less, or who feel monthly is excessive for their specific home. Cost: about 8% above the monthly per-visit rate (because the windows are dirtier by visit time), but only 6 visits a year instead of 12 · so the annual total is lower than monthly. For a three-bed semi at £35 monthly, the bi-monthly equivalent is roughly £37 to £40 per visit, six visits annually = £222 to £240 a year vs £420 monthly. About 47% cheaper annually.

Quarterly (every twelve weeks). About 12% of customers. Suits sheltered rural properties, price-sensitive retirees on fixed income, holiday homes with low occupancy, anything in the highlands or remote countryside where the air is genuinely clean. Cost: about 14% above the monthly per-visit rate (because the windows are very dirty by visit time and need stripping detergent), four visits a year. About 65% cheaper annually than monthly.

A small remainder (3 to 5% of customers) ask for fortnightly or weekly. Almost always commercial properties or specific premium customers in central London. Quote these as commercial work with a different pricing model · the round-density discount doesn't apply because the labour is heavier per visit than the residential bands suggest.

Don't choose "every six weeks" if your operator offers it. Customers struggle to keep track of it, the schedule drifts (it doesn't align with calendar months), and the round becomes hard to plan. Stick to the four/eight/twelve-week cadence triple.

What changes the calculation in your specific case

You live near a main road or major junction. Monthly is genuinely the right choice. The dust exposure makes anything longer look bad fast. The arithmetic also works in your favour · annual cost monthly versus eight-weekly is only about 47% more, but the visible difference is enormous.

You have mature trees over your roof. Especially in autumn (September through November) and spring (April through May). Monthly through the leaf season, then bi-monthly through winter is a common pattern · your operator can usually accommodate this on request.

You're within 8 kilometres of the UK coast. Salt spray builds up faster than you'd expect, especially from the sea-facing elevations. Monthly is standard; some Brighton, Bournemouth, and Cornwall customers go to two-weekly through winter when the salt is heaviest.

Your home faces north and has minimal direct sunlight on the glass. North-facing glass shows water spots and grime less clearly than south-facing because there's no raking sunlight to bring out the texture. Bi-monthly works fine.

You only ever sit in the back garden and don't care about the front from the inside. Honest customers ask their cleaner to do the rear monthly and the front quarterly. About 4% of UK rounds accommodate this; it's a normal request and not weird at all.

Conservatory glass. The conservatory roof gets dirty faster than vertical glass because gravity helps · pollen, leaves, bird droppings settle and stick. The wall glass behaves like normal exterior glass. Most operators recommend the conservatory be done on the same schedule as the house (so the cleaner is only making one trip) and pricing reflects that.

You're a holiday home or only there occasionally. Quarterly is right. The schedule keeps the windows from looking abandoned without paying for visits the property doesn't really need.

The honest sales pitch I make as an operator

When a new customer asks me what schedule to pick, I usually say: "Try monthly for three visits. By visit four you'll know if it's right for your property. Most people stay on monthly. If you find the windows still look spotless at visit time, bi-monthly will work fine and saves you money. About one in four customers move to bi-monthly after the trial run."

The reason the trial-run framing works is that customers can't honestly predict how dirty their windows get because they don't notice the gradual accumulation. Three monthly visits gives them ground-truth data on their specific exposure. Then they pick the cadence that fits.

If you're price-sensitive and want to start at the cheaper schedule, bi-monthly is the right entry point, not quarterly. The annual saving from bi-monthly to quarterly is small (about £15-£25 on a £35 monthly clean) and the windows look noticeably worse at quarterly intervals · most customers who start there move up to bi-monthly within a year.

Common questions I hear from new customers

"Won't monthly cleaning eventually damage the glass?" No. Modern water-fed pole cleaning uses purified water with no chemicals. There's nothing to build up, no abrasive scrubbing, no detergent residue. UK glass is rated for tens of thousands of clean cycles. Monthly cleaning for thirty years would be 360 visits · well within design tolerance.

"Should I wash the windows myself between visits?" You can but it usually makes things worse. Hand-washing with tap water leaves mineral deposits that show up the next day. If you do want to wash between visits, use distilled water (50p a litre from any supermarket) and a microfibre cloth on completely dry glass.

"What about inside the windows?" Inside surfaces stay clean for 4 to 6 months on average because there's no weather exposure · only cooking grease in the kitchen, fingerprints on the lower halves, and slow indoor-dust accumulation. Most monthly customers add an inside clean once or twice a year (typically March and September); the cleaner uses a ladder-and-squeegee approach for the inside since the water-fed pole stays outside. Inside cleans add 50-70% to the visit cost for the visits they're done on.

"What happens in heavy rain or snow?" Heavy rain washes some surface dust off but leaves spot patterns from drying. The clean is still useful even if it rained the next day · the rain doesn't undo the lifting of stuck-on grime that the water-fed pole did. Snow stops the operator working (the pole and brush ice up). Most operators reschedule snow-affected visits within the week.

"Can I skip a clean in winter when nobody can see the windows?" Yes if you want to, but ask your cleaner first · most rounds work on a fixed monthly schedule and a one-off skip can drift the round. The honest answer for most UK homes is that winter rain leaves harder-to-shift water-spotting than summer dust, so windows that have been skipped from December through February often need a deep clean in March rather than a normal monthly.

The arithmetic for your specific home

If you want a real number for your specific UK or Irish address, the Squeegify demo types your postcode and shows what the engine quotes for a monthly clean in ten seconds. It's calibrated against the live 2026 UK market · no signup, no email, no callback. Type your address; see the number.

If your real local operator quotes more than £8 off the demo number, ask them to walk through the line items · the shape of the breakdown often makes the difference clear.

If you're a working UK or Irish window cleaner reading this and you don't yet have an instant-quote tool on your own website, /pricing has the four plans. Solo £14.99/mo (30 quotes included). The first ten operators get FOUNDER25 for 25% off any plan, locked for the lifetime of the subscription.