How thick is a drylined wall?

Quick rule of thumb by system — board thickness + build-up of the system behind it:

• Dot-and-dab on sound masonry: 30–50mm total (12.5mm board + adhesive)
• Independent metal stud, single layer both sides: 75–100mm
• Independent metal stud, double layer both sides for sound: 150–200mm
• Stud with services cavity (M&E first fix): 100–150mm
• Acoustic partition to Part E (HMO separating wall): 100–150mm typical
• Fire-rated 60-min partition (BS 476): roughly 100–150mm
• Fire-rated 120-min partition: 150–200mm

What drives the choice in Maidstone properties:

• Maidstone town centre apartments: every millimetre counts. We use 9.5mm boards on a shallow 50mm stud where headroom and floor area are tight — gains you back roughly 40mm against a default 12.5mm/75mm build-up
• Victorian terraces in Bearsted, Loose, Staplehurst: the opposite trade-off. We add 50–80mm of insulated plasterboard and accept the room loss in exchange for a 60–80% drop in heat loss through the wall
• Commercial fit-outs in Maidstone riverside and the Lockmeadow: the partition thickness is set by the acoustic and fire spec first, room geometry second

Measure your door reveals and stair turnings before deciding. A 100mm partition that won't fit a 90° turn loses you more usable space than the thickness itself.