Party Wall & Ceiling Design
Get the separating wall and ceiling build-ups right before you build. We design Part E–compliant constructions so your sound testing isn’t a gamble.
Separating (party) walls and ceilings between dwellings have to control noise transfer to the standards in Approved Document E. Getting the build-up right at design stage is the difference between passing sound testing first time and tearing finished work apart to fix a failure.
We design and specify party wall and ceiling constructions — for new builds, conversions and changes of use — that meet the airborne sound insulation requirements of Part E, working with your chosen structure and finishes.
Designed to pass, not to hope.
Separating wall design
Masonry, timber and steel-frame party wall build-ups specified to achieve the airborne sound insulation Part E requires.
Separating ceiling design
Ceiling and floor/ceiling junction detailing for flats and conversions, controlling airborne sound between stacked dwellings.
Junctions & flanking
The detailing that actually decides pass or fail — wall-to-floor and wall-to-façade junctions, and flanking transmission paths.
When you need it
- You’re building new attached dwellings — houses or flats — that will need pre-completion sound testing.
- You’re converting a building into flats and need separating elements that meet Part E.
- A previous test failed and you need a remedial design that will pass on re-test.
One accredited team, start to finish.
Test-led design
We design with the test in mind — including the flanking paths that catch out build-ups which look fine on paper.
Works with your structure
Solutions tailored to masonry, timber or steel frame and to your finishes, not generic details.
One provider through to testing
The same team can carry out your pre-completion sound testing, so design and verification are joined up.
Avoid costly failures
Specifying correctly up front is far cheaper than reworking finished separating elements after a failed test.
Party Wall & Ceiling Design — your questions
When is sound insulation design needed instead of Robust Details?
Robust Details offer pre-approved new-build separating constructions that can avoid testing, but they don’t suit every project — especially conversions and unusual structures. Where Robust Details don’t fit, a bespoke acoustic design proves Part E compliance and is verified by pre-completion testing.
What causes party walls and ceilings to fail a sound test?
Most failures come from flanking transmission and junction detailing rather than the wall or ceiling itself — sound finding a path around the separating element through floors, façades or service penetrations. Good design addresses these from the start.
Can you design a fix for an element that already failed?
Yes. We can review a failed test, identify the likely transmission paths and design a remedial build-up or treatment to bring the element up to standard, then re-test to confirm.
Do you also carry out the sound test?
Yes — we provide sound insulation testing as well, so the same team can design the separating elements and verify them at pre-completion stage.
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Get a quote for party wall & ceiling design.
Tell us about your project and we’ll come back with a fixed price and the earliest date we can attend.