Co-buying vs. staying in the rental trap: a 10-year comparison

The hard part of renting is not the monthly cost, it is that saving happens after the rent is paid while the deposit target grows with house prices. Save 10% of a rising number and the gap can widen even as your balance grows.

Co-buying attacks the deposit problem directly: two to four people reach a given deposit far sooner than one person reaches it alone.

Renting: monthly rent, rising broadly with inflation, plus deposits and moving costs every few years. At the end of ten years, total housing spend is high and equity is zero.

Co-buying: mortgage interest and capital, insurance, maintenance of roughly 1% of value a year, plus purchase costs of stamp duty, legals and survey up front. At the end of ten years a meaningful chunk of capital has been repaid and any price growth belongs to the owners.

The honest comparison is not rent versus mortgage payment. It is total housing spend versus total housing spend, with equity treated as money you get back.

For most UK buyers, buying beats renting somewhere between year three and year six, once purchase costs have been absorbed. Below three years the transaction costs generally dominate and renting wins.

That maths shifts with your city, whether prices grow or stall, and how much maintenance the property needs. Run it with your own numbers rather than a national average.

Prices can fall, rates can rise at renewal, and a co-buyer can leave. Owning is less liquid and less flexible than renting, and that flexibility has real value if your job or life is likely to move.

The point is not that buying always wins. It is that most people never actually compare the two over a realistic horizon, and end up defaulting to renting by inertia.