Room Within a Room: The Diamond Acoustic Specification by Garden Spaces
Published: 23 January 2026
Reading Time: 4 minutes
If you’ve already explored the world of acoustic garden rooms, you’ll know that good sound isolation is rarely about a single upgrade. It’s about layering, mass, separation and, crucially, decoupling.
We recently looked in detail at how Garden Spaces design their acoustic garden rooms around real-world use, from home practice spaces through to professional studios, and how their Bronze to Platinum Plus packages help buyers choose the right level of sound reduction for their needs.
For clients with the most demanding acoustic requirements, Garden Spaces have now introduced another option: a fully decoupled room within a room, delivered as their new Diamond acoustic enhancement package.
Why “Room Within a Room” Matters
At the highest end of sound isolation, simply adding more layers to the main structure starts to deliver diminishing returns. This is where the room-within-a-room approach comes into its own.
Rather than relying solely on the outer shell of the building, the Diamond package introduces a separate internal acoustic structure, isolated from the main frame. Walls, ceiling and floor are all treated as independent elements, designed to reduce the transmission of vibration as well as airborne sound.
This level of separation is particularly important for:
- Drum kits and low-frequency instruments
- Loud amplified music
- Professional recording, mixing and teaching environments
- Situations where neighbours or family members are close by
In short, this is the point at which an acoustic garden room starts to behave more like a purpose-built studio than a domestic outbuilding.
Garden Spaces Diamond Acoustic Package
The Diamond package sits above Platinum Plus and represents the highest level of acoustic performance currently offered by Garden Spaces.
Rather than being a fixed “one-size” specification, it’s best understood as a system, combining increased mass, specialist materials and deep decoupling throughout the structure.
Walls: Maximum Mass, Maximum Separation
The wall build-up incorporates:
- A 150mm SIP core for the main structure
- Rubber-isolated fixings and metal furring strips
- Acoustic mineral wool
- Multiple layers of acoustic plasterboard
- A specialist quad-layer acoustic panel, combining plasterboard, closed-cell foam and mass loaded vinyl, fully decoupled at the edges
Indicative wall sound reduction figures reach up to 73dB, depending on configuration and layout.
Ceiling: Isolating Vibration from Above
The ceiling follows the same philosophy, with:
- EPDM rubber roofing over SIPs
- Resilient bars
- A specialist tri-layer acoustic panel
- Full skim-plastered internal finish
This helps control both airborne noise and structure-borne vibration - often overlooked, but critical for louder instruments.
Floor: Tackling Structure-Borne Noise
The floor is equally important in a room-within-a-room design, particularly for drums and bass-heavy sound.
The Diamond specification includes:
- A SIP floor structure
- A three-layer acoustic underlay system
- Choice of finished flooring
This helps limit vibration transfer into the ground and surrounding structures.
Decoupling: The Secret Sauce
Across all of Garden Spaces’ acoustic packages, decoupling plays a central role, but it’s taken furthest here.
Rather than rigidly fixing every layer together, the Diamond system deliberately introduces controlled separation between elements. Rubber isolation, resilient bars, specialist fixings and edge decoupling all work together to prevent sound energy from finding an easy path out of the room.
This is why the Diamond package isn’t just “thicker”, it’s structurally different.
Designed Around How You’ll Use the Space
As with every acoustic project by Garden Spaces, the Diamond package isn’t applied blindly.
This is where their experience really shows. Over many years, they’ve developed a way of breaking acoustic design down into walls, ceiling and floor upgrades, allowing clients to:
- Target performance where it matters most
- Balance acoustic goals with headroom and footprint
- Stay within Permitted Development limits where possible
- Make informed decisions about cost versus performance
Layouts can also be tailored to suit how the space will actually be used, with options including:
- Acoustic porches to control sound leakage at doors
- Control rooms and performance rooms within the same building
- Carefully considered glazing and ventilation strategies
Importantly, none of this comes at the expense of appearance. Externally, the building can still be finished in the same range of cladding and styles you’d expect from Garden Spaces, ensuring the studio sits comfortably in its garden setting.
Understanding the Numbers - Without Getting Lost in Them
Garden Spaces have also done a good job of demystifying acoustic performance for buyers, with:
- Clear tables showing indicative sound reduction across their range
- Real-world test videos demonstrating how different configurations perform
- Helpful context around decibel levels and what they mean in practice
As ever, the figures are guides rather than guarantees, performance varies with size, layout, glazing and use, but they provide a far more transparent starting point than is typical in this part of the market.
Learn More
If you haven’t already, it’s worth reading our recent overview of how Garden Spaces approach acoustic garden rooms and how their different enhancement levels compare in real terms.
You can also explore our archive of Garden Spaces acoustic builds, which shows how these principles have been applied across a wide range of projects — from compact practice rooms to highly specified professional studios — each tailored around the client’s sound levels, layout and day-to-day use.
To explore the new Diamond room-within-a-room acoustic option, visit the acoustic music rooms section of the Garden Spaces website or speak directly with the team on 0845 387 9 387 or by emailing info@gardenspaces.co.uk. They’re happy to talk through your requirements and advise on what level of acoustic performance is appropriate for your project.
