Realistic 2026 price for a 2.5 x 2.5 metre lean-to conservatory, with the old conservatory taken down and away, a strip brick and timber base installed, fully finished with plastering etc on a concrete foundation (already in place), with French doors and a solid roof?

A realistic 2026 budget for this job is £11,000–£15,000 including VAT, fully finished. Here is how that builds up for a 2.5 x 2.5m lean-to.

The conservatory itself sits at the bottom of the lean-to band: £8,500–£10,500 fitted for uPVC frames on a brick-and-timber dwarf base with French doors at this size. A solid tiled roof in place of polycarbonate adds £2,200–£3,500 on a roof this small, and a plastered, decorated ceiling with downlighters is another £1,000–£1,300. Taking the old conservatory down and away is £500–£900 — on a recent worked example, strip-out plus skip came to £680.

Your existing concrete foundation is real money off. Full groundworks (foundations, dwarf wall and slab) run to about £4,200 on a typical job, so expect quotes £1,500–£2,500 lighter — but ask each builder to confirm in writing that they accept the existing slab, its depth and the damp-proof membrane. If they will not warranty the base, they will price digging it out.

Get three like-for-like quotes with the strip-out, roof and plastering itemised separately. Our conservatory cost guide includes a full worked example line by line, and the conservatory cost calculator prices your exact size and roof choice.