Is it cheaper to reglaze a conservatory or rebuild it?

Reglazing is dramatically cheaper where the base and dwarf wall are sound, which they usually are. Rebuild only when the structure itself has moved or the footprint is wrong.

Do I need planning permission to replace conservatory glazing?

A like-for-like reglaze normally does not need permission. Changing to a solid or tiled roof is a different matter and may need building regulations approval, so check with your local authority first.

Can I put a solid roof on an existing conservatory?

Sometimes. It is considerably heavier than polycarbonate or glass, so the existing frames and base must be assessed as capable of carrying it. Never take that on assurance alone.

Costs by property

Cost of replacing conservatory glazing and doors

A conservatory that has gone tired is usually a glazing and door problem rather than a structural one. Replacing the side glazing and the doors on a sound base typically costs roughly £4,400 to £9,750, against many times that for a rebuild. The base and the dwarf wall are normally the parts still doing their job.

Most conservatories that look finished are not. The frames have greyed, the roof panels have yellowed and the doors have dropped, but the structure underneath is usually sound.

Worked example

8 windows

uPVC: £4,400 – £9,750
aluminium: £6,000 – £12,950
timber: £7,600 – £15,750

£4,400 – £9,750

supplied and fitted, uPVC

These figures come from published industry price guides, not official statistics, and several of those sources are installers or comparison sites with a commercial interest. They are a starting point for a conversation, not a quote. Your installer sets the actual price after measuring.

Costwise UK new windows cost guide · checked 2026-10-09
MyJobQuote door installation cost guides · checked 2026-10-09
Checkatrade double glazing cost guide · checked 2026-10-09

What has actually failed

On a conservatory of twenty years, the parts that have reached the end of their life are predictable: the polycarbonate roof sheets have yellowed and may be leaking at the glazing bars, the uPVC frames have chalked, the sealed units in the sides have misted, and the doors have dropped so they no longer lock cleanly.

The brick dwarf wall and the base are usually fine. That is the difference between a reglaze and a rebuild, and it is worth establishing before anyone quotes.

The roof is the big decision

Polycarbonate is the cheapest to replace and the least pleasant to sit under: noisy in rain and poor at holding heat. Glass is quieter, clearer and far better thermally. A solid or tiled roof turns the conservatory into something closer to a room, but it is heavier and the existing frames and base have to be able to carry it.

A solid roof on an existing conservatory is building work and may need building regulations approval. That is a question for your local authority, not for a salesperson.

Doors are usually the worst part

Conservatory doors take more use and more weather than any other door in the house, and they are usually the cheapest ones fitted. Dropped hinges, failed gearboxes and perished seals are standard by year fifteen.

Replacing just the doors, with French doors or a slider, often transforms how the space feels for a fraction of a rebuild. If they still close but stick, start with a repair.

Questions

Is it cheaper to reglaze a conservatory or rebuild it?: Reglazing is dramatically cheaper where the base and dwarf wall are sound, which they usually are. Rebuild only when the structure itself has moved or the footprint is wrong.
Do I need planning permission to replace conservatory glazing?: A like-for-like reglaze normally does not need permission. Changing to a solid or tiled roof is a different matter and may need building regulations approval, so check with your local authority first.
Can I put a solid roof on an existing conservatory?: Sometimes. It is considerably heavier than polycarbonate or glass, so the existing frames and base must be assessed as capable of carrying it. Never take that on assurance alone.