Made in Britainmember
10-year IWA insurance-backed warrantyon qualifying projects, subject to registration and policy terms.
Pecasa designs, manufactures and installs bespoke, fully insulated garden rooms in Buckinghamshire. Good garden room design starts with the garden, not a catalogue. We design every building around your plot, the views from the house, the path of the sun and how you plan to use the space.
Pecasa Ltd has completed more than 120 garden rooms, offices and annexes since 2017, and our team brings more than 100 years of combined construction experience. We manufacture our own Structural Insulated Panels (SIPs) in Watford. Our core team manages the build, with qualified specialists used where required.
We work across Amersham, Chesham, Beaconsfield, Gerrards Cross, Marlow, High Wycombe, the Chalfonts and Aylesbury, and throughout the rest of the UK.
Your planning authority is Buckinghamshire Council (or Milton Keynes City Council in Milton Keynes). Designing in Buckinghamshire often means working with protected landscapes. In the Chilterns National Landscape, cladding, roof form and siting matter as much as size, and extra permitted development limits apply.
Many garden rooms used for purposes incidental to the house fall within permitted development and do not need planning permission, provided they meet the size, height and location limits; for example, within 2 m of a boundary the building must be no more than 2.5 m high. Self-contained annexes, flats and listed buildings have different rules. We give guidance at your free survey and can recommend an external planning consultant where an application is needed.
Conservation areas in towns such as Amersham, Beaconsfield and Marlow also call for a more careful design approach.
Every Pecasa building is built to the Pecasa Standard: SIP walls, floor and roof made in our Watford factory, with EPS70 insulation as standard (75 mm to 250 mm) and PIR available as an upgrade; Radix ground screw foundations, subject to ground conditions and site suitability; a 1.5 mm EPDM rubber roof; Cortizo aluminium doors and windows; cladding chosen for your project; plasterboard walls with a tape-and-joint finish; 12 mm premium laminate flooring; and lighting and electrics designed to your requirements.
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.
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.
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. Cladding such as cedar, Shou Sugi Ban charred timber or Millboard, and a carefully chosen roof form, help a building sit naturally in the landscape.
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.
Contact us to book your free design consultation, or call 020 8146 2200. A member of our survey team visits your home, measures your garden, 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.