Independent UK guidePrices updated November 2026

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P-shape conservatory orangery conversion cost

Reviewed byZaib Khan
Updated onNovember 2026

An orangery conversion on a medium P-shape conservatory typically costs £14,000 to £35,000, fitted.

Small£15,800£9,000 to £22,500
Medium£24,500£14,000 to £35,000
Large£35,000£20,000 to £50,000

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.

Orangery conversions on a P-shape conservatory

P-shape to orangery conversions are larger projects and often come with new walls.

  • 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

Size Low Typical High
Small up to about 3m x 3m £9,000 £15,800 £22,500
Medium about 4m x 3.5m £14,000 £24,500 £35,000
Large about 5m x 4m or more £20,000 £35,000 £50,000

Other roofs for a P-shape conservatory

Roof Medium P-shape Best for
Tiled roof £10,900 to £15,400 Using the room every month of the year
Glass roof £5,100 to £8,200 Keeping the light and the view of the sky
New polycarbonate roof £3,900 to £6,100 The lowest cost fix for a leaking roof
Hybrid roof £9,600 to £14,800 Warmth with pools of daylight
Insulated roof panels £2,600 to £5,400 A warmer room on a tighter budget
Old glass roofStandard double glazing, the typical before
Orangery conversionA full extension feel without building a new room
Tiled roofUsing the room every month of the year
Glass roofKeeping the light and the view of the sky
New polycarbonate roofThe lowest cost fix for a leaking roof
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

Plastered ceiling under a solid roof £280 to £2,000 Usually included in branded tiled roof prices. Check it is on the quote.
LED spotlights in the ceiling £300 to £600 A set of downlights for a conservatory ceiling. Sometimes included.
Roof window or glazed panel £450 to £2,000 Adds daylight to a solid roof. Opening windows also help in summer.
Roof lantern £800 to £3,000 The glazed centrepiece of an orangery style roof.
Internal insulated pelmet £900 to £900 A plastered perimeter band that hides the frame head and adds insulation.
New fascias and guttering £150 to £775 Most solid roof systems come with their own gutter and fascia.

By region

Questions

How much is a orangery conversion on a P-shape conservatory?

A orangery conversion on a medium P-shape conservatory typically costs £14,000 to £35,000 fitted, with most quotes near £24,500. Small P-shape conservatories start around £9,000, and large ones reach about £50,000.

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 orangery conversion for my P-shape conservatory?

P-shape to orangery conversions are larger projects and often come with new walls.

How long will it take?

Expect 7 to 15 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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