UK Plasterboard Sizes — Complete Reference
Plasterboard is the most common wall and ceiling lining material in UK construction. This page lists all standard sizes, thicknesses, and types available from UK builders' merchants, with guidance on which to use where.
Standard Sheet Sizes
| Size (mm) | Size (ft approx.) | Area per sheet (m²) | Common use |
|---|---|---|---|
| 1800 × 900 | 6′ × 3′ | 1.62 | Small patches, repairs, DIY |
| 2400 × 1200 | 8′ × 4′ | 2.88 | Standard walls and ceilings (most common) |
| 2400 × 900 | 8′ × 3′ | 2.16 | Narrow access, stairwells |
| 2700 × 1200 | 9′ × 4′ | 3.24 | Higher walls (2.7 m ceiling height) |
| 3000 × 1200 | 10′ × 4′ | 3.60 | Tall walls, commercial, fewer joints |
| 3600 × 1200 | 12′ × 4′ | 4.32 | Commercial, specialist |
The 2400 × 1200 mm board is the UK standard and the most widely stocked at builders' merchants. Always check stock availability for less common sizes.
Thicknesses and Weights
| Thickness (mm) | Weight per m² (kg/m²) | Weight per 2400 × 1200 sheet (kg) | Typical use |
|---|---|---|---|
| 9.5 | ~7.5 | ~22 | Ceilings (with 400 mm joist centres), curved walls, over-boarding |
| 12.5 | ~8.5 | ~25 | Standard walls, ceilings (600 mm centres), dot and dab |
| 15 | ~12 | ~35 | Fire-rated walls (30 min), party walls, heavy-duty applications |
| 19 | ~15 | ~43 | 60-minute fire rating (single layer) |
Frequently Asked Questions
How thick is plasterboard?
Standard UK plasterboard comes in four thicknesses: 9.5 mm, 12.5 mm, 15 mm and 19 mm. 12.5 mm is the standard thickness for most walls and ceilings; 9.5 mm is a lighter board used for ceilings on close joist centres, curved walls and over-boarding; 15 mm and 19 mm are heavier boards used where extra mass or sound insulation is needed, or in fire-rated systems — note that a fire rating needs a Type F fire board (such as Gyproc FireLine) in a tested system, not just a thicker standard board. Exact weights vary by manufacturer, so check the datasheet (British Gypsum, Knauf or Siniat) for the specific board.
What thickness plasterboard should I use for a ceiling?
12.5 mm is the standard board for domestic ceilings on timber joists at 400 mm centres, and 9.5 mm can be used where weight matters, such as over-boarding an existing ceiling. Where joists are at 600 mm centres, either step up to 15 mm board or add mid-span noggings to support the board. The most common ceiling sheet size is 2400 × 1200 mm; boards are fixed with their long edge perpendicular to the joists. Use our Plasterboard Ceiling Calculator to work out boards, noggings and screws.
What size plasterboard should I use for walls?
For most walls the standard choice is a 2400 × 1200 mm sheet in 12.5 mm thickness — it is the most widely stocked size at UK builders' merchants and matches standard 600 mm stud centres, so each 1200 mm board edge lands on a stud. For rooms with 2.7 m or taller ceilings, 2700 × 1200 mm or 3000 × 1200 mm boards let you board floor-to-ceiling without a horizontal joint. Where access is tight, such as stairwells and lofts, 900 mm-wide boards (1800 × 900 or 2400 × 900 mm) are easier to handle.
Types of Plasterboard
- Standard (wallboard) — Ivory face, grey back. The default choice for most internal walls and ceilings. Available in tapered edge (TE) for jointing, or square edge (SE) for plastering over.
- Moisture-resistant (green) — Green face paper treated with silicone for use in bathrooms, kitchens, and other humid areas. Not waterproof — still needs tiling or tanking in wet areas.
- Fire-resistant (pink) — Contains glass fibre and other additives for enhanced fire protection. Available in 12.5 mm (30 min) and 15 mm (60 min) ratings. Required for party walls, garages, and fire escape routes.
- Acoustic board — Higher-density board for improved sound insulation. Used in party walls, floors, and anywhere Part E sound insulation is required.
- Thermal laminate — Plasterboard bonded to insulation (PIR or EPS). Available in various insulation thicknesses. Used for internal wall insulation and over-boarding cold walls.
- Vapour check — Standard board with a foil-backed face acting as a vapour barrier. Used on the warm side of insulation in timber frame and warm roof constructions.
Tapered Edge vs Square Edge
Tapered edge (TE) boards have a shallow taper along the long edges, creating a recess when two boards meet. This recess is filled with jointing compound and tape to create a flat, seamless joint. TE boards are used for dry-lining (no plaster skim) and are standard in commercial and modern residential construction.
Square edge (SE) boards have flat edges and are designed to be skim-coated with plaster after fixing. The plaster skim covers the joints and gives a traditional smooth finish. SE boards are the standard choice for domestic plastering in the UK.
Calculate Your Plasterboard Needs
Use our free calculator to work out exactly how many boards you need:
- Plasterboard Calculator — sheets, fixings and materials for your room
- Dot and Dab Calculator — adhesive quantities for dot-and-dab fixing
- Dry Lining Calculator — complete dry lining material list
Weights shown are approximate and vary by manufacturer. Major UK plasterboard manufacturers include British Gypsum (Gyproc), Knauf, and Siniat. Always check manufacturer datasheets for exact specifications.