The Chilterns

Elevated living, rooted in nature

A sculptural CLT extension where cascading green roofs frame expansive views of the garden.

Location: The Chilterns, Buckinghamshire
Status: Completed (2025)
Type: Residential Extension & Refurbishment
Scope: Single storey rear extension, internal remodelling, landscaping
Services: Technical Design Delivery | Architectural Visualisation | Construction-stage support
Appointed Architect: COUPDEVILLE

Designed by COUPDEVILLE, this mid-century-inspired, single-storey rear extension creates a contemporary addition to a Georgian-style home. The composition is defined by a series of stepped green roofs, expansive glazing and a prefabricated cross-laminated timber structure.

The CLT frame was manufactured off-site before being craned into position by the project team. Internally, an impressive ceiling height gives the principal living space a generous sense of volume, while the extensive glazing provides uninterrupted views across the garden.

The wider project included internal renovations and the integration of a biomass boiler system for domestic hot water. Externally, a new pergola, bespoke concrete outdoor kitchen and enhanced landscaping create a series of complementary spaces for outdoor living.

View of a modern house with large glass windows, a manicured lawn, bushes, and tall trees with no leaves under a partly cloudy sky.
A brick house with a chimney, multiple windows, and a garden with trees and bushes. The sky is cloudy.
Backyard patio area with brick and glass exterior walls, stone pathway, garden plants, and some trees in the background.
Brick house with smokestack, surrounded by garden with trees and plants, gravel ground, cloudy sky.
A house with a brick exterior, a circular window, and a chimney surrounded by a garden with various plants, flowers, and a wooden and metal bench. There is a leafless tree in the foreground and other trees in the background under a cloudy sky.
A cozy living room with large floor-to-ceiling windows showing an outdoor garden with trees, bushes, and decorative planters. The room has a beige sofa with red and green pillows, a coffee table with a bowl and a candlestick, and a fireplace with a T
A kitchen with a marble countertop and backsplash, a gold faucet, a stove, and kitchen books on a shelf below the counter. There are chairs with woven backs in the foreground, and blurred green leaves in the upper left corner.
A backyard garden with green plants and flowers in a raised brick bed, a grassy lawn, and a wooden outdoor kitchen and patio area under a shelter with string lights.
Outdoor kitchen area with a concrete countertop, wooden cabinetry, and shelves with vases and decorative items. Hanging wicker pendant lights illuminate the space, surrounded by greenery and brick walls.
A brick house with multiple windows, surrounded by trees and a garden. There is a gravel pathway in the foreground and a brick plant bed with a small tree. The sky is partly cloudy.
Modern living space featuring a black-framed glass door, a leather lounge chair with a matching footrest, a small gray sofa, and a view of a garden with a flowering tree through the window.
Living room with beige sofa, decorative pillows, a black coffee table with items, a side table with lamps, wall art, a leather armchair, and a white brick fireplace with stacked firewood. The room has natural light from windows and ceiling beams.

Before

A backyard patio area with outdoor dining furniture, a wooden pergola, and a brick house with a tiled roof. There are people standing and walking, and a table with decorative objects. Overcast sky and neighboring houses are visible.
Construction workers at a building site with a crane lifting a large wooden beam, working on framing and foundation for a new structure.

Our Project Team

Technical Design Delivery, Visualisation and Construction Support: LOTA Architecture
Architecture: COUPDEVILLE
CLT: ConstruktCLT
Interior Design: Adam Bray
Landscape Design: Hugo Elwes
Doors and Windows: IQ Glass
Main Contractor: Atkins Project Management