Independent UK guidePrices updated September 2026

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P-shape conservatory new polycarbonate roof cost

Reviewed byZaib Khan
Updated onSeptember 2026

A new polycarbonate roof on a medium P-shape conservatory typically costs £3,900 to £6,100, fitted.

Small£3,800£2,800 to £4,700
Medium£5,000£3,900 to £6,100
Large£6,300£5,000 to £7,500

A P-shape joins a lean-to to a Victorian bay, giving a long room with a rounded end. The roof has both a single slope and a faceted section, joined by valleys, which makes it one of the more complex roofs to replace.

New polycarbonate roofs on a P-shape conservatory

Replacing polycarbonate on a P-shape is still quick, but the valley seals are worth replacing at the same time.

  • The valley where the two sections meet is a common leak point on old roofs and needs careful detailing on the new one.
  • Two zones in one room, often a dining area and a lounge, so lighting and heating are planned for both.
  • More roof area and more junctions mean higher prices than a single shape of the same floor area.

Price by size

SizeLowTypicalHigh
Small up to about 3m x 3m£2,800£3,800£4,700
Medium about 4m x 3.5m£3,900£5,000£6,100
Large about 5m x 4m or more£5,000£6,300£7,500

Other roofs for a P-shape conservatory

RoofMedium P-shapeBest for
Tiled roof£10,900 to £15,400Using the room every month of the year
Glass roof£5,100 to £8,200Keeping the light and the view of the sky
Hybrid roof£9,600 to £14,800Warmth with pools of daylight
Insulated roof panels£2,600 to £5,400A warmer room on a tighter budget
Orangery conversion£14,000 to £35,000A full extension feel without building a new room
Old glass roofStandard double glazing, the typical before
New polycarbonate roofThe lowest cost fix for a leaking roof
Tiled roofUsing the room every month of the year
Glass roofKeeping the light and the view of the sky
Hybrid roofWarmth with pools of daylight
Shorter bars on both sides mean a steadier room. Solid bar is the best published figure, pale bar the range across grades and tints. U-value in W/m²K; solar is the g-value or solar transmission. Figures from maker data (Ultraframe, Thermotec and others); hybrid and orangery are estimated from their solid and glazed areas. How we built this.

Extras to budget for

New fascias and guttering£150 to £775Most solid roof systems come with their own gutter and fascia.
Removal and disposal of the old roof£120 to £800Usually included. Skip hire alone is about 120 to 300 pounds.

By region

Questions

How much is a new polycarbonate roof on a P-shape conservatory?

A new polycarbonate roof on a medium P-shape conservatory typically costs £3,900 to £6,100 fitted, with most quotes near £5,000. Small P-shape conservatories start around £2,800, and large ones reach about £7,500.

Why does a P-shape roof cost more than other shapes?

The valley where the two sections meet is a common leak point on old roofs and needs careful detailing on the new one.

What should I check before choosing a new polycarbonate roof for my P-shape conservatory?

Replacing polycarbonate on a P-shape is still quick, but the valley seals are worth replacing at the same time.

How long will it take?

Expect 1 to 2 days on a medium P-shape conservatory, and a day or two more on this shape if it is large or needs frame work.

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