You have a home project on the horizon.
You know roughly what you want. And you're probably already aware that it's going to cost a significant amount of money.
What nobody tells you is that the most expensive mistakes in a home renovation rarely announce themselves. They happen in the planning, in the sequencing, in the small decisions handed off to the wrong people at the wrong time. Or worse still, the absence of any decision at all, when standard practice fills the gap and nobody thinks to question it.
This guide covers the ten I see most often. They aren't made by clueless people, they're made by smart, capable homeowners who simply didn't know what they didn't know.

Most don't fail because of bad taste or a tight budget.
They fail because of a series of small decisions, made before a designer was ever involved that shape every outcome that follows.
The sequence decisions get made in
Who makes the finish decisions on site
When the electric plan happens (and when it doesn't)
What "having a vision" actually means vs. what most people think it means
This guide pulls back the curtain on all of it.
You own a period or country home with a project on the horizon
You want a beautiful, cohesive result
You'd rather know what to avoid than learn the hard way
You're considering working with a designer and want to understand the process
What happens after you download:
Instant access to the 10 Costly Mistakes guide
A short email series going deeper on the mistakes that cost homeowners the most
Ongoing insights through my newsletter, The Interior Monologue

I'm Clare, an interior designer specialising in period and country homes across Kent and East Sussex.
Before interiors I spent 15 years in fashion design, which means colour, texture and proportion were my daily currency long before I ever picked up a floor plan.
I've seen these mistakes play out on real projects, with real budgets. This guide exists because I'd rather you avoided them.

Copyright Clare Connolly Interior Design 2026