How to Run a Window Cleaning Business: Rounds, Retention and Weather

Window cleaning has a structural advantage most trades would take instantly: the customer needs you again in four weeks, and again after that, indefinitely. There is no re-selling, no re-quoting and no seasonal cliff. The trade-off is that margins per job are small, which means everything depends on how many you complete in a day — and that comes down almost entirely to how tightly the round is built.

A round is a route, not a list

The most expensive habit in this trade is accepting every customer who calls. A house fifteen minutes outside your patch does not cost you fifteen minutes once. It costs you thirty minutes of driving every cycle, forever, for one modest job.

Build by street instead. Canvass one road, get four houses, then work outward from there. Decline what does not fit, or price it high enough that the travel is genuinely paid for. An operator with a dense round completes far more work in a day than one with the same number of customers scattered across a town, on identical effort.

Get off doorstep cash

Collecting payment in person means returning to houses where nobody was home, chasing money instead of doing work, and carrying unpaid visits into the next cycle. On a round of a few hundred customers it quietly becomes a part-time job.

Card on file or direct debit removes it entirely. Customers are used to it now and object far less than operators expect. Most people who make the switch describe it as the single biggest improvement to how the business feels to run — the work becomes the work again.

Weather, and the buffer that absorbs it

Rain does not stop a water-fed pole clean, and the customers who think it does mostly need telling once, clearly, when they sign up. What genuinely stops work is wind, ice and storms.

The useful defence is not a policy, it is slack. A round planned at full capacity every day has nowhere to put a lost Tuesday, so a bad week cascades into cancelled customers and apologies. A round with a small buffer absorbs it across the following days and nobody notices.

Retention is almost the whole business

A customer who stays three years is worth many times one who leaves after two visits, and there is no acquisition cost on any cycle after the first. So the economics reward keeping people far more than winning them.

What loses customers is rarely the clean. It is unpredictability — turning up at random intervals, disappearing for two months, being unreachable. The operators with the best retention are usually the ones who arrive on a recognisable schedule and answer their phone, both of which are unglamorous and neither of which requires being the best cleaner in town.

Reviews: ask on the third visit, not the first

After one clean, all a customer can honestly say is that the windows look better. True, and also what every window cleaner's reviews say. It is not what a prospective customer is worried about.

What they are worried about is whether you will keep coming. Almost everyone has had a window cleaner who was excellent for three months and then stopped appearing, with no notice and no answer. By the second or third visit your customer can speak to that, and “third month, turned up on the day both times” does far more work than any description of the glass.

You have an advantage here that most trades do not: you see the same people repeatedly, so you can ask at the right moment rather than the only moment. Use it. And for long-standing customers, the highest-value request is not a new review but an update to the one they already left, adding how long you have been coming — “four years, never missed a round” is close to impossible for a new competitor to match.

The practical constraint is that most of your customers are out when you work, which is exactly why a text sent at completion works better here than anywhere. It arrives while they are heading home to clean windows, so the result and the request land together. A card through the door competes with the post and usually loses.

What limits most window cleaners

Taking every customer regardless of location and calling a full book success. Still collecting cash. Running the round at full capacity with no slack, so one storm week creates a fortnight of apologies. Competing on price with someone who will be gone by spring. And working a round for years without collecting the reviews that would prove the one thing customers actually care about — that you are still turning up.