How much does a glass garden room cost in the UK?

The honest answer: a quality glass garden room pergola costs between £12,400 and £22,500 for the structure itself, depending on size, model and configuration. That figure covers the aluminium frame, glass roof panels, posts and all fixings — delivered to your door and ready to install.

It does not include optional add-ons like side screens, integrated heating or professional installation, which we cover in detail below. But as a starting point, here is exactly what you will pay for each model in our range:

Glass garden room vs conservatory vs traditional pergola — cost comparison

A glass garden room pergola is not the only way to add covered outdoor living space to a UK home. Here is how the four main options compare on total cost, installation time, planning requirements and year-round usability:

The glass pergola occupies a compelling middle ground: meaningfully more weatherproof and usable than an open timber pergola, at a fraction of the cost and complexity of a conservatory or extension. For most UK gardens, the glass pergola delivers the best return on investment per pound spent.

For a deeper breakdown of glass vs traditional pergola specifically, read our glass pergola vs traditional pergola buyer's guide.

What affects the price of a glass garden room in the UK?

The variance between £12,400 and £22,500 comes down to four factors. Understanding each one helps you build a specification that hits your budget without compromising where it matters.

1. Size

Unsurprisingly, size is the biggest driver. Moving from a 4×3m to a 5×3.5m model adds £2,000–£3,000 to the price. A 6×4m model adds £4,000–£6,000 over the entry-level size. As a rough guide, each additional square metre of covered area costs £600–£900 in the glass and frame materials alone.

Measure your intended space carefully before specifying. Most customers find that a 4×3m or 4×4m wall-mounted model is the sweet spot for a typical UK terrace or patio: large enough for a dining table for six, small enough to keep costs manageable.

2. Wall-mounted vs freestanding

A wall-mounted pergola uses your home's exterior wall as one structural side, reducing the number of posts and roof sections required. This typically saves £800–£1,500 compared to an equivalent freestanding model. If your intended position is directly adjacent to the house, wall-mounted is almost always the better value choice.

Freestanding models make sense if you want the structure away from the house, in a separate area of the garden, or if the wall attachment is not feasible (for example, on a listed building where drilling is restricted).

3. Side screens

The glass roof gives you rain and sun protection. Side screens give you wind shelter and privacy, turning the structure from a covered terrace into a proper outdoor room. Each side screen costs £1,800. A typical setup with two screens on the exposed sides adds £3,600 to the total.

Side screens are the single highest-impact upgrade for year-round use in the UK climate. If your budget allows only one add-on, it should be screens on the windward sides.

4. Integrated heating

An electric infrared patio heater mounted inside the pergola frame makes the space usable on cold evenings from March through November. Our heaters range from £600–£1,150 per unit. Most installations use one to two heaters depending on the size of the structure.

Infrared heaters heat people and surfaces directly rather than trying to warm the air, which makes them highly efficient in an open-sided structure. Running costs are typically £0.50–£1.20 per hour at current UK electricity rates.

Does a glass garden room require planning permission in the UK?

In the vast majority of cases, no planning permission is required. Glass garden room pergolas are classified as temporary structures and typically fall within permitted development rights for residential properties in England, Scotland and Wales.

The conditions under which planning permission is typically not required:

• The structure is in a rear or side garden (not front garden facing a highway)
• The structure does not exceed 50% of the total garden area
• The eaves height does not exceed 2.5m
• The overall height does not exceed 4m (dual pitch) or 3m (any other roof)

You should always check with your local planning authority if your property is in a conservation area, is a listed building, or sits within an Area of Outstanding Natural Beauty. In these cases, permitted development rights may be restricted.

Our team is happy to advise on your specific property. Call us on 0330 133 6617 and we can discuss your situation before you commit to a purchase.

Will a glass garden room add value to my property?

Yes — and the evidence is fairly consistent. Covered outdoor living structures with year-round usability typically add 5–15% to a property's market value, according to UK estate agent surveys and property data. The uplift is highest when:

• The garden is a key selling feature of the property
• The structure is properly specified with screens and heating (usable year-round)
• The design complements the house's architecture (aluminium frames in anthracite grey are broadly compatible with both modern and period properties)

On a £400,000 UK home, a 5% uplift is £20,000 — comfortably more than the cost of a well-specified glass pergola. Even at the conservative end (2–3% uplift), you are close to recovering the full cost through added value, before accounting for the years of use you'll get from the space.

This compares favourably with conservatories, which frequently fail to add their full cost back in value and which carry ongoing maintenance liabilities that glass pergolas do not.

Our glass garden room range

All three models are built from powder-coated aluminium frames with toughened glass roof panels, available in grey or anthracite grey. Free delivery to mainland UK is included.

Frequently asked questions