Scottish Building Standards: Section 5: Noise

‍‌​​‌‌​‌‌‌​​​​​‌‌‌​​​‌​‌​​‌‌‌‌‌​‌‍# Scottish Building Standards, Section 5: Noise

In Scotland, "Noise" isn't about neighbour disputes. It's about making sure sound doesn't travel so easily through the building that it drives people mad or fails the legal standard. If you're working on flats, terraces, conversions, or anything with shared walls and floors, this section is live for you.

1. What the Noise section is trying to achieve

Noise in the Scottish Handbooks is about two main things:

• Airborne sound · voices, TVs, music, traffic noise.
• Impact sound · footsteps, things dropped on floors, chairs scraping.

The standards aim to:

• Limit sound passing between separate dwellings (flat to flat, house to house).
• Limit sound between dwellings and certain noisy spaces (stairs, common areas, plant).
• Give people a reasonable level of acoustic privacy and comfort.

2. Mandatory standards vs guidance

Same pattern as the other sections:

• Mandatory standard: buildings must be designed and constructed so that noise from other parts of the building or adjoining buildings is reasonably inhibited.
• Detailed guidance: minimum performance figures (sound insulation values in decibels), acceptable construction types, how to test and prove compliance.

If you follow the recommended constructions and details, and don't butcher them on site, you're generally taken to meet the Noise standard.

3. Where Noise really bites: separating walls and floors

The big focus is on separating elements between different dwellings:

• Separating walls · between flats, between semi-detached/terraced houses.
• Separating floors/ceilings · between flats above and below, maisonettes, etc.

The Handbooks give guidance on:

• Performance targets (in decibels) for airborne and impact sound.
• Example constructions (masonry walls, timber studs, concrete floors with treatments, timber floors with floating layers).
• Flanking · sound going around the main wall or floor via connected structures.

The warning is simple: if you swap or thin down acoustic details, you're almost certainly dropping below the required performance: and that can be picked up in testing.

4. Typical on-site noise mistakes

Here's where people quietly destroy acoustic performance without realising:

Bridging cavities and isolation

• Stuffing solid material into an acoustic cavity that was meant to be mostly air.
• Hard-fixing both sides of a "decoupled" system to the same studs or structure.

Wrong or missing insulation

• Forgetting the sound insulation in separating walls/floors, or under-filling cavities.
• Swapping specified acoustic mineral wool for whatever's cheapest and lightest.

Floor finishes

• Putting hard surface flooring (laminate, tiles) straight onto a separating floor that was designed assuming carpet and underlay.
• Skipping or thinning down the resilient layer in a "floating floor" build-up.

Flanking paths

• Leaving continuous plasterboard or lightweight linings that bridge across separating elements.
• Running continuous ceiling voids or services that bypass a separating wall.

Every one of these chips away at the dB performance that the Handbook expects and the warrant assumed.

5. Conversions and change of use, higher risk

Converting a building to flats or different use is where Noise is easiest to mess up:

• Old floor and wall constructions often don't meet modern sound insulation levels on their own.
• The warrant drawings will usually show extra linings, independent studs, resilient bars, added mass and insulation to bring them up to standard.

On site:

• Don't assume "it's solid, it'll be fine" · the design is there because the old structure wasn't fine on its own.
• Follow the upgrade details exactly: correct board types and layers, correct stud and bar layouts, full consistent insulation.
• If you "simplify" these details for speed or cost, you're gambling with pre-completion test results.

6. Testing and proving compliance

For many new flats and certain houses, you'll be looking at:

• Pre-completion sound testing · airborne and impact tests by an acoustic tester.
• Or use of approved robust constructions that can avoid some testing, if followed without variation.

From your side:

• Assume you might be tested, and build like you definitely will be.
• Don't rely on "this is a good detail" if you've changed the spec · the robust detail only "counts" if you follow it exactly.
• If testing is required, allow for: time near completion with quiet conditions, access to multiple dwellings, and possible remedial work and retest if it fails.

If you've cut corners on noise details, it usually shows up here, at a very awkward time.

7. Noise inside the same dwelling

The Handbooks are mainly about between dwellings, but there's also an eye on:

• Limiting noise from certain plant and systems (noisy kit near bedrooms).
• Reasonable acoustic separation in some internal layouts.

Good practice on site:

• Keep very noisy items (pumps, extractors, boilers) away from bedrooms where the drawings allow.
• Use proper isolating mounts and acoustic details where specified · don't hard-fix vibrating kit to thin partitions.

8. How Noise fits into warrant and completion

Same pattern:

• Warrant: granted based on a design that meets Noise standards · specific wall/floor builds or robust details.
• Completion: verifier may ask for test results, or confirmation that robust constructions were followed.

If the sound tests fail and your build doesn't match the design:

• Opening up works.
• Adding extra linings or treatments.
• Paying for retests.

All of which cost you time, money and goodwill.

9. Practical rules for noise jobs in Scotland

Before you start

• Get the acoustic details from the warrant drawings or spec.
• Highlight anything marked as separating construction, resilient layer, acoustic insulation, independent frame.

While building

• Don't change board types, insulation density, or floor build-ups without written redesign.
• Make sure everyone (joiners, plumbers, sparks) knows not to bridge decoupled linings or cut huge holes through separating elements.
• Take photos before closing up · especially of insulation, resilient bars, and floating floor layers.

At the end

• Check finishes match what the design assumed (if tests assumed carpet, don't hand over bare laminate and expect the same performance).
• If sound tests are planned, get them booked and protect the building from noisy works that could ruin the test window.

The bottom line

Noise performance is not "automatic" just because a wall looks solid. It comes from specific constructions and details, and if you change them, you change the performance.

Treat the Noise section with the same respect you give Structure and Fire, and you'll avoid a lot of grief with failed tests and unhappy neighbours.

What to do next

• Read: Working in Scotland · building standards explained
• Read: Scottish Building Standards · Section 1: Structure
• Read: Scottish Building Standards · Section 2: Fire
• Read: Scottish Building Standards · Section 3: Environment
• Read: Scottish Building Standards · Section 4: Safety
• Read: SiteKiln Building Regulations Part E · Sound (England) · for comparison

Sources (UK)

• Building (Scotland) Act 2003 · primary legislation.
• Scottish Building Standards: Technical Handbook (Domestic), Section 5: Noise, mandatory standards and guidance for sound insulation.
• Robust Details Ltd · approved constructions that can reduce testing requirements.
• BS EN ISO 140 / BS EN ISO 16283 · sound insulation testing standards.

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