How a 'while I'm here' upsell turns a £150 job into a £900 one

The upsell that actually costs people money in home improvement rarely arrives as an obvious con. It arrives as a series of individually reasonable observations, made by someone who's already inside your house, mid-job, holding a tool: "while I'm here, I noticed …" — the wiring behind that socket, the flashing around that vent, the pipe under that sink. Each one, on its own, sounds like useful information from someone qualified to spot it.

What makes it work isn't dishonesty about the individual observations — sometimes they're genuinely accurate. It's the setting. Agreeing to extra work standing in your own kitchen, mid-job, with someone waiting for an answer, is a completely different decision than the same extra work quoted separately, in writing, with time to think or get a second opinion. The pressure isn't verbal, it's situational: saying no feels awkward when the person's already there and already trusted enough to be doing the original job.

The fix isn't refusing every "while I'm here" observation outright — some are worth acting on. It's separating the observation from the decision. "Can you write that up as a separate quote and I'll get back to you" costs nothing, doesn't offend a legitimate tradesperson, and turns an in-the-moment yes into a normal decision made with the same scrutiny as the original job got.