Music studio with drum set, guitars, keyboard, computer with music production software, and various audio equipment.

SPECIALIST SOLUTIONS FOR BESPOKE SPACES

PREDESIGNED STUDIO ANNEX OPTIONS

NEW FOR 2026!

  • Small black modern house with a flat roof, situated on a grassy lawn with trees in the background.

    - E L O W Y N -

    FLAT ROOF DESIGN

    FINISH OPTION SHOWN- CHARRED SIBERIAN LARCH [OTHER FINISHES AVAILABLE]

    CORTEN STEEL WINDOW REVEALS

  • A small, black wooden house with a metal roof, three windows, and a gray door, situated on a well-maintained grassy lawn surrounded by trees.

    - E N Y S -

    PITCHED ROOF DESIGN

    FINISH OPTION SHOWN- CHARRED SIBERIAN LARCH [OTHER FINISHES AVAILABLE]

    CORTEN STEEL WINDOW REVEALS

  • A small black modern shed with a flat roof, surrounded by green grass and trees in the background.

    - B R I A L L E N -

    MONO PITCH ROOF DESIGN

    FINISH OPTION SHOWN- CHARRED SIBERIAN LARCH [OTHER FINISHES AVAILABLE]

    CORTEN STEEL WINDOW REVEALS

  • Small modern black house with vertical siding, door, and window, set on a concrete slab in a green yard with trees in the background.

    - K E L Y N -

    FLAT ROOF DESIGN

    FINISH OPTION SHOWN- CHARRED SIBERIAN LARCH [OTHER FINISHES AVAILABLE]

    CORTEN STEEL WINDOW REVEALS

  • Small black modern house with a wooden deck, surrounded by green grass and trees.

    - G W Y T H -

    FLAT ROOF DESIGN [CANTILEVER]

    FINISH OPTION SHOWN- CHARRED SIBERIAN LARCH [OTHER FINISHES AVAILABLE]

    CORTEN STEEL WINDOW REVEALS

    NATURAL SIBERIAN LARCH ROOF SOFFIT AND DECKING

  • -T R O S E K -

    SOUNDPROOF MUSIC STUDIO- SOUNDCORE. CONSTRUCTION SYSTEM

    FINISH OPTION SHOWN- NATURAL SIBERIAN LARCH [OTHER FINISHES AVAILABLE]

W H O

A R E

W E ?

A man with a beard and a suit jacket holding a certificate, smiling in an office with multiple computer monitors and sound equipment.

At Phase Design and Build, we specialise in transforming outdoor spaces into bespoke garden studio annexes tailored to your lifestyle.

Led by skilled Carpenter-Builder Luke Bunkum and Chartered Architectural Technologist Matthew Selleck MCIAT, we offer a complete design-and-build service that blends craftsmanship with technical expertise. Luke ensures every structure is built to the highest standard using quality materials, while Matt’s knowledge of design, planning, and building regulations guarantees each studio is both visually striking and fully compliant.

Young man in a green shirt using a miter saw to cut a long piece of wood outdoors, surrounded by green trees and grass.

Whether you’re dreaming of a home office, hobby room, guest suite, cinema space, or a soundproof recording studio via our soundcore construction system, we create functional, beautiful environments designed around your needs. Our collaborative approach means we work with you from the first sketch to the final finish, ensuring your studio annex becomes a true extension of your home.

Let’s bring your ideas to life and build a space that’s uniquely yours.

Aerial view of a modern white house with a brown-tiled roof, a wooden deck, and a gravel yard, surrounded by neighboring houses with different roofing styles and a garden with trees and bushes.
Aerial view of a residential backyard showing a house with a wooden deck, a smaller building with skylights, parked cars, and surrounding trees and fences.
An aerial view of a small white house with a gray tiled roof and two skylights, surrounded by gravel and a white boundary wall. There is a gray vehicle parked to the right of the house and a large potted plant near the front door. The scene includes
Newly constructed small house with white siding, black framed glass doors, and two black framed windows on gravel yard, with a stepping wooden staircase on the right and a garden with shrubs and pots in the background.
A black shed with a glass door and a small glass window, reflecting trees and the sky. A greenhouse with gardening tools and supplies is to the right, and the scene is shaded by nearby trees.
Construction of a small wooden structure or shed outdoors with framing and partial wall panels in progress, surrounded by trees and plants.
Exterior of a modern wooden house with a black door and a small horizontal window, snow covering the ground and roof edge, purple 'PHASE design and build' logo in bottom right corner.
A music producer's home studio with drums, guitars, a keyboard, and a person working at a computer surrounded by audio equipment and soundproofing.
Small black wooden garden shed with glass sliding door and a small window, situated on gravel ground, with neighboring houses and planting pots visible.
A small black metal shed with a flat roof, situated on a gravel surface, surrounded by trees and bushes under a clear blue sky.
Living room with a large sliding glass door, a potted plant, a sofa with pillows, and sunlight streaming through window blinds.
Exterior view of a modern white house with a wooden deck, two sets of glass sliding doors, and windows with blinds, under a partly cloudy sky.
Modern house with white exterior walls, large windows with blinds, a black front door with a vertical handle, and a wooden deck in front.
Construction site with wooden framing, ladder, and construction materials for building a house or structure.
At a trade show booth, a man in a black shirt and pants stands with hands in pockets near a display with banners and a large monitor showing construction inside a wooden room. The booth has promotional materials, banners with QR codes, drum parts, an
Construction of a small wooden shed on a concrete foundation on a gravel surface, with partially built walls and construction tools nearby.
Detailed architectural design plans and 3D models of a garden room structure with a gable roof, including cross-sectional views and construction details.
Home construction site with wooden framing for walls and roof.

what we do

OUR SERVICES

Modern office space with a white desk, black office chair, yellow chairs, a computer, and a sign on the wall that says 'archi.co' and 'PHASE design and build'.
Interior view of a workshop or construction area with wooden beams and tools, including a circular saw, workbench, and stored lumber, seen through an open door.

Predesigned

Our predesigned studio annexes (garden rooms) offer quick, cost-effective solutions with professionally developed layouts. These ready-made designs ensure reliable quality, reduced planning time, and a smooth, efficient installation process.

Prefabricated (modular) – Nationwide

Factory-built modular annexes delivered nationwide for fast, precise installation. Modules connect to a low impact ground screw foundation, and provide consistent build quality, and reduced on-site construction time.

Prefabricated (panels) – Nationwide

Panel-based systems crafted off-site and shipped nationwide. Ideal for tight-access sites, offering quick structure assembly and clean installation with excellent efficiency. Intertwines with our build pack options for step by step guidance for your own installation, each panel section is possible to man handle without the requirement of cranes, with all further calculated loose material supplied.

On-Site Installations (within radius)

Comprehensive on-site construction for customers within our radius. Ideal for custom requirements, complex access, or specialist foundations, ensuring a fully tailored, high-quality build at your property.

Bespoke Design and Build

A fully customised service offering complete design freedom. We create unique garden rooms tailored to your lifestyle, property, and specification.

Soundproof Garden Studios- Soundcore.

Expertly engineered soundproof rooms using acoustic materials and specialist provisions. Ideal for music studios, therapy spaces, or offices, delivering exceptional noise reduction and privacy. Delivered as our panel supply with loose material and build pack to ensure installation as per design spec for your peace of mind.

A white cargo van with 'PHASE design and build' logo, contact info, and social media icons parked outside a warehouse, with wood planks on roof rack.
TALK TO US!

SOUNDPROOF GARDEN STUDIOS

A man playing a drum set in a recording studio, sitting on a bench with a bass drum, snare drum, and cymbals, surrounded by soundproofing panels and ceiling lights.
Sourcegraph logo with a purple corner and the company name in black outline text

SOUNDPROOF STUDIO ANNEX SYSTEM FOR MUSICIANS LOOKING TO MAKE SOME NOISE!

DESIGNED AND BUILT BY MUSICIANS - FOR MUSICIANS (ESPECIALLY DRUMMERS!)

A small wooden shed with a flat roof covered in snow, a gray door, and a rectangular window with snow on the sill, set in a snowy yard with neighboring houses visible in the background.

DOUBLE DOOR AND MULTI LAYERED GLASS PANE WINDOW SYSTEM

A dark-colored door with a metal handle and lock, set in a wooden wall, with snow at the bottom and on top of the wall.

AVAILABLE AS A FULLY DELIVERED SYSTEM NATIONWIDE WITH ASSOCIATED BUILD PACK [STEP BY STEP GUIDE] SO THAT YOU CAN ENSURE ALL MATERIAL IS TO OUR DETAILED DESIGN SPEC!

A music studio with a drum set, guitars, and a keyboard, and a person working on music production at a computer with audio editing software.

TIMBER FRAME ROOM WITHIN A ROOM CONSTRUCTION

A person sitting at a music production desk in a home studio, playing guitar. The room has musical instruments, headphones, a computer with digital audio software, a microphone, speakers, a keyboard, and various music gear. Acoustic panels are on the walls, and there are storage bags and guitars leaning against the wall.

WE REVISIT OUR FIRST SOUNDPROOF STUDIO BUILD FROM DECEMBER 2023

The natural timber cladding has weathered down a lot in the year and half since our first garden build- Matts own drum studio in his garden!

<< Check out the soundproofing results

CONTACT US

Email: office@phasedandb.com

Tel: 01579 560124

Unit 18 Trelawney Business Park, Callington, Cornwall, PL17 7SD

A person with painted nails holding a smartphone with a laptop and a remote control on a wooden table.