The more affluent older folk will see an increase in their income from higher interest rates on their savings so least likely to feel need to reduce outgoings. Now might be a good time to recruit some into your round if you don't have many.
There are other social groups who will benefit from increased interest rates, as a gross generalisation any one who has no debt. get more of these on your rounds if you can.
The impact on those of us with debt (mortgages, cc. loans etc) will of course be dictated by the size of rate increase, but in the main I think most 30 - 55 early to middle aged who have been on the property ladder for some time & thus built up reasonable equity in their homes will have been quids in since 2008 due to ultra low rates, so most will have some cushion in their income to absorb a 1 or 2% increase.
The buy to let market will probably take a hit, so be mindful if you have a lot of these. and there are loads around at the moment as the kids cant afford to get on the ladder anymore!
The current house price boom (south east) will be tempered as the housing market slows so at least you wont lose customers through moving, but the flip side is limited opportunity to gain new customers from new folk moving in.
For those who have alot of shoe boxes under their beds, you might want to start thinking of ways to get that cash invested to benefit from better returns offered in isa's or other investments.
Be aware that rising interest rates usually mean lower inflation, as window cleaning is a relatively low (materials) cost business there is limited opportunity to benefit from low price increases for our supplies and it could make it more tricky to justify price increases to customers.
Just as a point of note, if your are worried about interest rate increases try not to be, after all it was the artificially low interest rates kept in place by the Federal Reserve (USA central bank) for too long after dot com crash in 2000, that ultimately lead to the credit crunch in 2008, which effected (and still does) all of us. So interest rate increases are not a completely bad thing.
failing all that if rates go up considerably (3 - 4%) we could always execute a highly leveraged carry trade Buying the pound and selling EUR & sit back and rack in a ton of interest rate swaps and join the Bollinger Brigade over at Canary Wharf
All jokes aside - as with any change in circumstances try to think how your business will be effected, how will your customers (market) be effected then think and plan contingencies.
I have some experience in business strategy & planning & more than happy to share some thoughts and ideas if you are worried about interest rate increases and other matters that effect our businesses, if it helps.