Noisy conservatory roof in the rain

If your conservatory sounds like a drum every time it rains, the roof is the cause, and polycarbonate is the usual culprit. Which? says polycarbonate roofs can be noisier than glass, particularly in rain, and lists noise alongside poor temperature control as reasons a polycarbonate roof can be a false economy.

Why is my conservatory roof so loud in the rain?

Rain noise is the sound of drops striking the roof. A thin, light, stiff sheet is easy to set vibrating, and the hollow flutes inside multiwall polycarbonate do little to damp it. A heavier or layered roof, such as insulated panels or a tiled roof with a plastered ceiling, absorbs more of each impact before it reaches the room. Hard floors and glass walls then bounce the sound around, which is why an empty conservatory sounds louder than a furnished one.

Hail is worse. One installer describes polycarbonate as “extremely noisy during rain and hail”, which is a sales claim but matches what owners say.

What nobody has published, as far as we could find, is an independent decibel test of rain on polycarbonate, glass or tiled conservatory roofs. Everything below is based on consumer surveys, owner reports and maker claims, labelled as such.

How to reduce rain noise on a conservatory roof

In cost order:

1. Soften the room. Rugs, curtains and upholstered furniture absorb reflected sound, so the room sounds less harsh. They do nothing about the drumming on the roof itself.
2. Close roof blinds when it rains. Fabric under the roof may take the edge off. We found no test showing by how much.
3. Line the roof from inside. An Irish Examiner article says retrofit insulated roof systems reduce both heat loss and noise, without giving figures. LABC’s guidance suggests an opaque lining is likely to end the building regulations exemption, so check before you buy.
4. Fit insulated roof panels (about £1,800 to £4,600). One maker quotes customers who “no longer need ear defenders when it rains”. It is a testimonial, not a measurement, but it is the cheapest roof-level change.
5. Switch to a glass roof (about £3,500 to £7,000). Which? rates glass as quieter than polycarbonate. The roof stays translucent, so it is usually exempt from building regulations.
6. Fit a tiled or hybrid roof (about £6,600 to £12,600). Owners on the MoneySavingExpert forum who replaced polycarbonate with an insulated solid roof reported much less rain noise. Guardian’s brochure says its roof “reduces rain noise and sun glare”, a maker claim.

Prices are typical fitted ranges for a medium conservatory (about 4m x 3.5m). Installers usually quote including VAT, but check.

Will thicker polycarbonate be quieter?

Re-sheeting with new polycarbonate is one of the cheapest roof-level changes, at about £2,700 to £5,200 for a medium conservatory, and it is tempting to go thicker in the hope of a quieter roof. Thicker sheet certainly insulates better: 35mm sheet has a U-value of about 1.2 to 1.3, against 1.9 to 2.4 for 16mm, on retailer and maker figures. Our guide to polycarbonate thickness compares the sizes.

Whether it is noticeably quieter, we could not find tested anywhere. It is still a light plastic sheet, and Which?’s comments about polycarbonate and rain apply to the material, not to one thickness. If noise is the main reason you are spending money, polycarbonate is the wrong thing to spend it on.

Which conservatory roof is quietest?

Roof	What the sources say about rain noise	Evidence
Polycarbonate	Noisier than glass, particularly in rain	Which?
Glass	Quieter than polycarbonate	Which?; installer claim
Insulated panels	Customers no longer need “ear defenders”	Maker testimonial
Tiled or solid	Much less rain noise after converting	Owner reports; maker claim
Hybrid	As tiled, but the glazed panels add a little noise	Maker and installer descriptions

On owner reports, a solid roof is the quietest, and glass is the middle ground if you want to keep the light. If you are weighing those two, our glass vs polycarbonate comparison sets out the other trade-offs.

Is rain noise alone worth a new roof?

Usually not on its own. Noise is rarely the only complaint: a roof loud enough to bother you is usually a polycarbonate roof that also overheats in summer, loses heat in winter and, if it is old, may be discoloured or leaking. If that describes yours, the case for replacing it rests on all of those together, and our conservatory roof costs page shows what each option costs by style and size.

That is the pattern in Which?’s April 2026 member survey too: among the comments from conservatory owners were people who had replaced a polycarbonate roof with tiles, and “the temperature is difficult to regulate” was the most common regret, named by 24%. Quiet is a side effect of fixing the bigger problem.

If noise really is the only issue and the roof is otherwise sound, try the soft furnishings and blinds first, then insulated panels.

When you get quotes, ask each installer to describe the roof build-up layer by layer, and treat any decibel figure as a claim unless it comes with a test report.