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About our insulated garden rooms
We stock 3 Calmpod insulated garden rooms built for genuine year-round use in the UK. Unlike standard log cabins or summerhouses, these use sandwich-panel construction with 100mm insulation in the walls, floor and roof. The result is a building that stays warm in January and cool in August without excessive heating costs.
The Calmpod 8x8 at £9,799 suits a single home office or therapy room. The 8x12 and 12x8 models at £11,500 give you space for a studio, meeting room or garden gym. Every model includes double-glazed windows, integrated electrical trunking and a pre-finished composite exterior that never needs painting.
For uninsulated timber buildings at lower price points, browse our Power garden buildings range. For smaller pods and saunas, see our small garden rooms. We also stock home saunas if wellness is your priority.
Why We Chose This Range
"We tested many so-called 'insulated' garden rooms before adding Calmpod. Most were just log cabins with foam wedged between boards. Calmpod uses proper SIP-style sandwich panels with factory-bonded insulation. The U-values match a modern house wall. I have sat in one during a February frost with a single 1kW panel heater and it held 20 degrees comfortably. That tells you everything about the build quality."
, Matt, Greenhouse Stores
Insulated garden room vs log cabin vs summerhouse
| Feature | Insulated Garden Room | 44mm Log Cabin | Standard Summerhouse |
|---|---|---|---|
| Wall insulation | 100mm SIP panels | 44mm solid timber | 12-19mm T&G |
| Glazing | Residential double glazing | Double-glazed uPVC | Single glass 3-4mm |
| U-value (walls) | 0.15 - 0.25 | 0.40 - 0.50 | 0.70+ |
| Year-round use | Yes, heated office ready | With extra insulation | Spring to autumn only |
| Maintenance | None, composite exterior | Stain every 2-3 years | Annual treatment |
| Best for | Home offices and studios (Matt's Pick) | Workshops and hobby rooms | Seasonal garden use |
Matt's Installation Tip
Insulated garden rooms weigh significantly more than standard sheds because of the multi-layer wall, floor and roof panels. A paved patio base is often not sufficient. I recommend a steel-reinforced concrete raft at least 100mm thick. This prevents the differential settlement that jams doors and cracks internal finishes over time. Also budget for an electrician to run armoured cable from your consumer unit. The trunking inside the building is pre-routed, but the final connection must comply with Part P regulations.
Frequently Asked Questions
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Do insulated garden rooms need planning permission?
Most insulated garden rooms fall under permitted development. Our Calmpod models are designed to stay under the 2.5m maximum height when placed within 2m of a boundary. The building must not cover more than half the garden and cannot be used as self-contained sleeping accommodation. Listed buildings and conservation areas have additional restrictions.
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How warm is an insulated garden room in winter?
A 100mm SIP-insulated room holds 18-22 degrees with a small heater. The wall U-value of 0.15-0.25 matches a modern house. A 1-2kW panel heater or oil-filled radiator is enough for an 8x8 pod. Running costs average £0.50-1.00 per hour depending on your tariff. The double-glazed windows prevent heat escaping through the glass.
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What is the difference between a garden room and a log cabin?
Insulation is the main difference. A 44mm log cabin relies on timber mass for warmth and needs extra insulation for year-round use. An insulated garden room has factory-bonded SIP panels in the walls, floor and roof. This gives it U-values 3-4 times better than an uninsulated cabin. The trade-off is price: insulated rooms cost more per square metre.
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Can I use an insulated garden room as a home office?
Yes, that is the primary use case for these buildings. The insulation keeps you warm in winter and cool in summer. Integrated electrical trunking handles sockets, lighting and data cables. You need an electrician to connect the armoured cable feed from your house. Most customers are up and working within a week of delivery.
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What base does an insulated garden room need?
A reinforced concrete raft at least 100mm thick is recommended. The building is heavier than a standard shed or log cabin because of the multi-layer construction. Paving slabs can work on well-compacted hardcore, but concrete gives the most stable long-term result. Allow 150mm extra around the footprint for drainage clearance.