Conservatory Glazing Installation and Replacement Cost Calculator

How this calculator works

This calculator estimates a realistic price range rather than a single figure, because real-world quotes genuinely vary that much. It starts from typical UK supplied-and-fitted price ranges drawn from published 2026 industry cost guides, then multiplies them by the number of units you enter and by adjustment factors for each choice you make below. The result is a low-to-high band that a fair quote is likely to fall within, not a promise of the exact price you will pay.

Replacing conservatory glazing typically costs around to per roof panel and to per side frame supplied and fitted in 2026, so a full reglaze of a typical conservatory commonly lands between and . That compares with five figures for a full structural replacement, which is why reglazing, or converting to a solid roof, is usually the first option to price when a conservatory has become too hot, too cold or tired looking.

Number of roof panels to replace

Enter how many glazed roof panels need replacing. A typical lean-to conservatory has 4 to 6 roof panels, while Victorian and Edwardian styles commonly have 8 to 12. If you are only replacing failed or discoloured panels rather than the whole roof, count just those.

Number of side window frames to replace

Enter how many vertical window frames around the sides of the conservatory need reglazing or replacing. Count each framed section as one unit.

Glazing specification

Standard double glazed units are the baseline for conservatory reglazing. Solar control glass, which reflects a large share of the sun’s heat, typically adds around 25 percent but makes a dramatic difference to summer comfort in south-facing conservatories, and self-cleaning coatings are often bundled with it. Triple glazing adds weight as well as cost, so the roof structure must be checked before specifying it overhead.

Where you live

Labour rates are not uniform across the UK. Published cost guides consistently show installation prices in London and the South East running roughly 20 to 30 percent above the national average, driven by higher labour costs, travel, parking and congestion charges. The calculator applies an uplift of around 20 percent if you select London and the South East. Product prices themselves are broadly similar nationwide, so the difference mostly reflects fitting costs.

What else affects the price

Conservatory glazing prices hinge on whether the panels are glass or polycarbonate, the panel sizes, and how the existing framework has aged. Polycarbonate is cheaper but noisier and far worse thermally, which is why most reglazing projects upgrade to sealed glass units. Roof work usually needs access equipment, and any panel replacement should include a check of the glazing bars, end caps and seals, since failed seals rather than the glass itself are often the real problem. If the frames themselves have blown or warped, a larger refurbishment or a tiled conversion may be better value than piecemeal reglazing.

Planning permission, building regulations and certification

Like-for-like window replacement on most houses does not need planning permission, but listed buildings always require consent and conservation areas often restrict materials and styles on visible elevations, so check with your local planning authority if either applies. Building regulations apply to every replacement window in a dwelling, setting minimum energy performance and safety glazing standards. Installers registered with a competent person scheme, such as FENSA or Certass, can self-certify compliance and issue a certificate after completion; otherwise you must arrange building control sign-off separately. Keep the certificate safe, as buyers’ solicitors routinely ask for it when you sell.