There is a moment in almost every garden design conversation where the client says: "We want the patio to flow straight out from the kitchen, completely level with the floor inside." It is one of the most popular requests I hear, and I understand why. That seamless connection between indoors and out transforms how you use your garden.
But here is where experience matters. Buried in your house wall, roughly 150mm above ground level, sits a thin strip of material called the damp-proof course. Build your patio above it, and you invite moisture straight into your home. I have seen the consequences more times than I care to count over 36 years of practice: ruined plaster, black mould, and repair bills that dwarf the cost of the patio itself.
This article explains what the DPC is, why it matters, and how a well-designed patio can give you that level threshold without compromising your building's integrity.