Pecasa designs, manufactures and installs bespoke garden rooms across Hertfordshire from our factory in Watford. We work in Watford, Radlett, Bricket Wood, St Albans, Bushey, Borehamwood, Harpenden, Hemel Hempstead, Rickmansworth, Berkhamsted and surrounding towns. Every room is designed around your garden, access and how you plan to use it.
Prices start from £23,000 including VAT for a 3 m × 2.8 m garden room. Every Pecasa building is bespoke, and your final quotation reflects the design, specification and site requirements. You will also receive a free 3D design and a written, VAT-inclusive quotation, normally within seven days of your survey.
Buildings over 30 m² need Building Regulations approval. Requirements and any fees are confirmed for each design.
Popular upgrades include Samsung or Mitsubishi air conditioning with Wi-Fi control, additional acoustic insulation, a WC or shower room, a kitchenette, composite decking, triple glazing, smart-home features and bespoke storage. Each upgrade is specified and priced in your quotation.
Site clearance, electrical supply connections to the building, water and drainage connections, skips and parking permits are priced separately.
| Element | Pecasa specification |
|---|---|
| Structure | SIP walls, floor and roof, made in our Watford factory |
| Insulation | EPS70 core as standard, 75 mm–250 mm; PIR available as an upgrade. U-values depend on the selected build-up |
| Foundations | Radix ground screws, made in Britain, installed by our Radix-trained team, subject to ground conditions and site suitability |
| Roof | 1.5 mm EPDM Flex-Proof membrane with rear gutter and downpipe |
| Doors and windows | Cortizo aluminium; French, bi-fold or sliding; triple glazing available |
| Cladding | Chosen for each project: Millboard (Board & Batten or Shadow Line), cedar, Shou Sugi Ban charred timber, Durasid Foresta or Ceta composite |
| Interior | Plasterboard walls with a tape-and-joint finish |
| Flooring | 12 mm premium laminate |
| Electrics | Designed to your requirements; qualified electrician; Electrical Installation Certificate |
| Ventilation | Background ventilation, plus any extraction the design and Building Regulations require |
| Climate (upgrade) | Samsung or Mitsubishi air conditioning with Wi-Fi control, specified in your quotation |
In England, many garden rooms used for purposes incidental to the house, such as an office, gym or studio, fall within permitted development and do not need planning permission, provided they meet the relevant size, height and location limits. For example, a building within 2 m of a boundary must be no more than 2.5 m high. Planning rules differ elsewhere in the UK. Flats, listed buildings, conservation areas and self-contained annexes have different rules. We give guidance at your free survey and can recommend an external planning consultant where an application is needed.
Much of Hertfordshire is Green Belt. Permitted development rights for garden rooms generally still apply, but planning applications, including most annexes, are assessed more strictly. Historic centres such as St Albans, Harpenden, Berkhamsted and Hertford include conservation areas, and listed buildings have extra restrictions. Hertfordshire has ten district and borough councils, so the rules that apply depend on your address.
Building Regulations are separate from planning. A building under 15 m² with no sleeping accommodation is normally exempt. Between 15 m² and 30 m², it is normally exempt if it has no sleeping accommodation and is at least 1 m from a boundary or built substantially of non-combustible materials. Larger buildings, sleeping accommodation and new drainage need approval.
For garden rooms up to 16 m², we guarantee installation within two weeks (10 working days) of the start of work on site, subject to the agreed specification, site access and weather. Typical working days on site:
Larger rooms and annexes are scheduled individually, and your quotation confirms the installation period for your project.
A free survey, then a free 3D design and a written, VAT-inclusive quotation, normally within seven days of your survey. You can also start with our online 3D designer.
Yes. Every room is bespoke, from size and layout to glazing, cladding and internal features.
Yes. SIP walls, floor and roof with Cortizo aluminium glazing keep the room comfortable. Air conditioning or heating can be specified.
We give guidance at your free survey and can recommend an external planning consultant. Pecasa does not submit planning applications itself.
Contact us to book your free design consultation. A member of our survey team visits, measures your garden in Hertfordshire, checks access and discusses how you will use the room. It usually takes 10–30 minutes. You will also receive a free 3D design and a written, VAT-inclusive quotation, normally within seven days of your survey.