Replacing a Victorian-style conservatory roof

A Victorian-style conservatory, sometimes called a bay design, has a rounded front formed from three or five angled sides. The roof rises from each facet to a central ridge, with hips running diagonally from the ridge to the eaves. A hip is the sloping external line where two roof planes meet around a corner.

That geometry means more cuts and more weak points where rain could get through. The old roof was probably a continuous polycarbonate or glass system with an aluminium ridge. A solid replacement has a timber structure, insulation, a waterproof layer and a covering of tiles or slate-effect sheets, and each hip has to be set out and finished with care. For the wider choices, see solid and tiled conservatory roofs for Stroud homes.

Because the plan is not square, the roof is usually set out from a centre point, with each rafter cut to its own angle. Two roofs that seem identical from the pavement can differ in the number of facets and in the angle of each, which is why we measure on site and do not work from a catalogue drawing.

On a tiled roof, ridge and hip tiles run along the high lines. Since BS 5534:2014 they are not left to depend on mortar alone: a mechanical fixing is added, and dry-fix systems are tested to BS 8612 (Marley, updated 2026). MyBuilder quotes dry ridge at about £40 to £60 per metre, and a faceted roof has far more metres of hip than a lean-to of similar floor area, so this part of the quote deserves attention.

At the house wall, a lead flashing seals the joint between roof and brickwork. Where two planes meet in an internal angle, that angle is a valley, a channel that collects water and needs lead or a purpose-made trough. We mark all these junctions on the survey, so your quote covers the hips, ridge and valleys and nothing is left out.

Lead is graded by code, and Code 4 is the usual general choice for flashing work (Leadworx), though a long or exposed run may call for a heavier code. We choose the code for each junction on the survey, so the quote names it.

A solid roof is much heavier than the glazing it replaces. The old frame spreads that load across several corner posts and a ring beam, and every one of those points is inspected on a Victorian plan. If the frame was designed for a light roof, it may need strengthening, which MyBuilder prices at £500 to £2,000 where required.

The Part L 2021 Table 4.2 limit for a new roof element is a U-value of 0.15, which shapes how much insulation the build-up needs. Consent is handled as building control work, and we explain it and manage the notification where the job is notifiable. Our guide on Building Regulations for a solid conservatory roof sets out the rules in full.

Each corner post also takes wind uplift, not just downward weight, so the fixings at the head of the frame matter as much as the posts themselves.

Once the roof is solid, the inside becomes a blank space. A plastered or boarded ceiling can follow the faceted shape or be flat; see plastered ceilings inside a solid conservatory roof for the finishes. Lighting can be set into the ceiling, which suits a room that had nothing overhead before.

Many owners worry about losing daylight. Keeping the glazed walls is part of the answer, and adding roof windows or a glazed panel to the new roof is the other. Roof windows must meet 1.4 under Part L, while rooflights are held to 2.2, so the number and position of openings change the energy balance. See can a solid conservatory roof have roof windows for the detail.

The survey photographs the existing roof, frame, eaves and wall junction. It records the number of facets, the pitch, the condition of the posts and the state of the base walls. A priced, written quote then follows: scaffold, strip, structure, insulation, covering, ridge and hips, finishing and waste.

MyBuilder puts a solid roof at £5,000 to £10,000 as a national typical range, and complicated plans tend to sit in the upper part of it. Planning is a separate question: where the house is listed, or inside a conservation area, the district council's planning team should be asked before you commit. The whole service starts on our conservatory roof replacement page.

Victorian-style conservatories are often chosen for their looks, with finials, cresting along the ridge and decorative eaves. When the roof is replaced, owners usually want to keep those features, or at least the proportions. Most can be reproduced or refitted, and they are best listed at survey so the quote shows which features stay and which are renewed.

Roof colour and tile profile matter as much as the shape. A tiled covering that picks up the house roof ties the room to the building, and our page on matching a conservatory roof to your house goes into that. Like for like applies to the house itself, so we do not suggest changing the original covering to suit the new room.