A 6m x 4m conservatory (24 m²) in the UK typically costs between £18,000 and £55,000 fully installed, depending on style, frame material, glazing specification, base type, and finish level. A basic uPVC lean-to with a polycarbonate roof sits at the lower end around £18,000–£25,000, while a premium aluminium Victorian or Edwardian with triple glazing and a tiled roof can reach £45,000–£55,000 or more.

Common conservatory styles that suit a 6m x 4m footprint include: Lean-to (simple mono-pitch, best for low eaves), Victorian (multi-faceted bay front, classic look), Edwardian (square or rectangular with a hipped roof, maximises floor space), Gable-front (vaulted ceiling, contemporary feel), and P-shaped or T-shaped (combines two styles for larger spaces). Edwardian and lean-to styles make the most practical use of a rectangular 6×4 footprint.

In most cases a 6m x 4m conservatory falls within permitted development rights in England, meaning you do not need planning permission provided it meets certain criteria: it must not exceed 50% of the land surrounding the original house, must not be forward of the principal elevation, the height must not exceed 4m (or 3m within 2m of a boundary), and it must be separated from the main dwelling by external walls, doors, or windows. Always check with your local planning authority as rules differ in Wales, Scotland, Northern Ireland, and for listed buildings or conservation areas.

uPVC is the most popular choice due to its low cost, low maintenance, and good thermal performance. Aluminium is slimmer, stronger, and more contemporary-looking, with better longevity but at a higher price. Timber offers the most traditional aesthetic and is the warmest-looking material, but requires regular maintenance (painting or staining) and costs the most. For a 6×4 conservatory, uPVC is the best value choice; aluminium suits modern homes; timber suits period properties.

A polycarbonate roof is lightweight and inexpensive but poor at regulating temperature — it gets very hot in summer and cold in winter, and can be noisy in rain. A glass roof (using double or triple-glazed units) is significantly better thermally, quieter, brighter, and more attractive, but costs more. A tiled or solid roof provides the best thermal performance and most room-like feel, but is the most expensive option and may require building regulations approval. Most buyers now choose glass or tiled roofs.

A well-designed and properly built conservatory can add between 5% and 15% to a property’s value, depending on quality, location, and how well it integrates with the house. A poorly built or dated conservatory (especially one with a polycarbonate roof) may add little or even deter buyers. High-quality glazed or tiled conservatories that feel like a proper room throughout the year tend to add the most value.

For a 6m x 4m conservatory, the structure itself (frame, glazing, and roof) typically accounts for 50–60% of the total cost. The base and foundations represent 15–25%, and fitting, labour, and finishing (electrics, heating, plastering, flooring) make up the remainder. Upgrading from polycarbonate to glass roof, or from uPVC to aluminium frames, can add £3,000–£10,000 to the total.

A 6m x 4m conservatory typically takes 2 to 4 weeks to build once materials are on site. Lead times from order to installation are usually 6 to 12 weeks. The base and groundwork (1–3 days), frame erection (2–4 days), glazing and roof (2–3 days), and finishing work (electrics, heating, flooring — 3–7 days) are the main stages. Weather delays and site-specific complications can extend the timeline.