COST GUIDES
How much does a lean-to conservatory cost in 2026?
Updated 07/26
Fast Facts
Polycarbonate lean-to (3m × 3m): £8,100–£11,880
Glass lean-to (3m × 3m): £9,000–£13,200
Tiled lean-to (3m × 3m): £18,000–£26,400
Biggest cost driver: Your choice of roof material has the biggest impact on the overall price
Whether you're looking to create a brighter dining area, a garden room or simply add extra living space, a lean-to conservatory is often one of the most affordable ways to extend your home.
The overall cost depends on the size of the conservatory, the roof type and the materials you choose.
This guide explains typical lean-to conservatory costs, what affects the price and how to compare quotes from checked conservatory installers working in your area.
If you'd like to compare different conservatory styles, our main conservatory cost guide covers the full range of options.
How much does a lean-to conservatory cost?
All figures below are based on a 3m × 3m lean-to conservatory and include supply and installation unless stated otherwise.
| Type of roof | Size of conservatory | Price - Range low | Price - Range high | Average UK Cost (+VAT) |
|---|---|---|---|---|
| Polycarbonate | 3m x 3m | £8,100 | £11,880 | £9,990 |
| Glass | 3m x 3m | £9,000 | £13,200 | £11,100 |
| Tiled | 3m x 3m | £18,000 | £26,400 | £22,200 |
| Last updated: July 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||||
As a guide, prices start at around £8,100 for a polycarbonate roof and rise to around £26,400 for a tiled roof. The type of roof you choose has the biggest influence on the final cost.
Get a quote for lean-to conservatory installation in your area
The best way to understand what your project is likely to cost is to compare a selection of quotes from checked lean-to conservatory installers working in your area.
Find a conservatory installer near you
What's included in the price?
A typical lean-to conservatory quotation usually includes:
Groundworks and foundations
Conservatory frame
Glazing
Roof
Installation
Forming the opening into your home (where required)
Items such as flooring, plastering, decorating and furnishings may be quoted separately, so it's always worth checking exactly what's included before comparing quotes.
If you're considering an orangery instead, remember the construction methods and specification are different, so costs aren't directly comparable.
How much does a small lean-to conservatory cost?
If you're working to a budget, keeping the conservatory smaller is usually the easiest way to reduce costs.
A 3m × 3m polycarbonate lean-to starts from around £8,100, while a smaller 2m × 2m design can cost even less, making it a popular option for utility spaces, dining areas or garden rooms.
Transformation by Checkatrade member, ND Installations SW Ltd.
How do different sizes affect the cost?
As you'd expect, larger conservatories cost more because they require additional materials, glazing and labour. As a guide:
Size | Typical cost range |
|---|---|
2.5m x 2m | £6,000–£9,000 |
3m x 3m | £8,000–£12,000 |
4m x 3m | £9,000–£14,000 |
5m x 3m | £12,000–£18,000 |
5m x 4m | £15,000–£22,000+ |
Costs vary depending on the roof type, glazing specification and regional labour rates.
Use these figures as a guide, then compare a selection of quotes from checked conservatory installers to understand what your own project is likely to cost.
How long does a lean-to conservatory take to build?
Once the groundwork is complete, most lean-to conservatories are built quite quickly. The exact timeframe depends on the size of the conservatory and the type of roof you've chosen.
The overall project timeline is longer than the build itself. Factor in time for planning checks, comparing quotes, lead time on materials, and any groundworks that need to happen first.
Realistically, from first enquiry to a finished conservatory, allow two to three months.
What affects lean-to conservatory costs?
Two conservatories of the same size can have very different price tags. The final cost comes down to the specification you choose and the amount of work involved.
Size: The larger the footprint, the more materials and labour you need. Each extra square metre adds to the base cost and the groundworks underneath it
Roof type: This is the single biggest cost driver. Polycarbonate roofs are the cheapest option. Glass roofs cost more but let in better quality light and look smarter. Tiled roofs cost the most and are closer to a full extension in terms of thermal performance. If you’re thinking about replacing your conservatory roof at a later date, that’s a separate project with its own price range
Frame material: uPVC is the most affordable frame option and works well for most homes. Aluminium costs more but is slimmer, stronger, and suits contemporary builds. Timber is the most expensive and needs regular maintenance, but it’s the right choice for period or listed properties
Location: Regional labour rates affect the total cost. Builds in London and the South East typically run 10–20% higher than the UK average
Finishing touches: Flooring, extra insulation, decorative glass, thick glazing, and furnishings are often quoted separately. Ask upfront what’s included so you can compare quotes fairly
On Checkatrade, you'll only find trades who meet our high standards and pass up to 12 checks.
Lean-to conservatory cost calculator
The quickest way to estimate your budget is to think about the type of lean-to you'd like, its size and specification.
Job Estimate Calculator
This calculator provides a guide price only. For an accurate figure for your installation, compare a selection of quotes from checked lean-to conservatory installers working in your area.
Find a conservatory installer near you
Should you build a lean-to conservatory yourself or hire a tradesperson?
While DIY conservatory kits are available, it's normally best to hire a professional installer.
The foundations need to be level, the roof must be weatherproof and the connection to your home needs to be properly sealed. If electrics are being installed, they'll also need to be completed by a qualified electrician.
For glazed or tiled conservatories, or any project involving structural work, it's sensible to choose a checked installer who is registered with FENSA or DGCOS.
Getting the installation right first time is usually far more cost-effective than putting problems right later.
Lean-to conservatory cost checklist
Before work starts:
Find a conservatory installer near you
Finding a checked conservatory installer for your lean-to project is straightforward with Checkatrade.
When requesting quotes, it helps to include:
The size of conservatory you're planning
The roof type you'd prefer
Whether groundworks are already complete
Any planning or listed building constraints
Whether you want electrics, heating or blinds included
Comparing a selection of quotes from checked conservatory installers working in your area is the easiest way to understand your options and what's included in each quotation.
Browse checked conservatory installers near you
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Lean-to conservatory cost FAQs
Usually not. Most lean-to conservatories fall under permitted development, so you don't need to apply for planning permission. The main exception is if the floor space exceeds 30 square metres, or if your property is on designated land (for example, a conservation area or AONB). If you're unsure, check with your local planning office before you start.
A well-built lean-to conservatory should add value. A quality conservatory can add to your property's value, though that depends on build quality, size, and local market conditions.
Yes. Always use a qualified conservatory installer who is FENSA or DGCOS registered. These accreditations mean they meet industry standards for glazing and building work, and their work will be covered by an insurance-backed guarantee.
Rough supply-and-fit costs run from about £200–£300 per square metre for a uPVC lean-to, up to £300–£400 per square metre for aluminium and £400–£600 per square metre for timber. Location, frame material, and spec all affect the final figure.
A uPVC-framed lean-to with a polycarbonate roof is the cheapest option. For a 3m x 3m build, you're looking at £8,000–£12,000 supply and fit. Polycarbonate is lighter and faster to install than glass or tile, which keeps labour costs down too.
Most lean-to conservatories don't need building regulations approval, as long as they are under 30 square metres, have an external door between the conservatory and the house, and the glazing and roof meet the relevant performance standards. If you remove the external door or use a solid roof, building regs may apply, so ask your installer to confirm. If you're thinking about refurbishing an existing conservatory rather than building new, the rules may differ.
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