Plasterboard (also called drywall or gypsum board) is the most widely used internal lining material in UK construction. Whether you are drylining a masonry wall, partitioning a room, or boarding out a loft conversion, understanding the different board types and sizes will help you specify correctly and avoid costly errors — particularly around fire safety and moisture resistance, where Building Regulations set clear requirements.
Standard Sizes
Plasterboard is manufactured in standard sheet dimensions. The vast majority of UK residential work uses the following:
| Sheet Size (mm) | Common Use |
|---|---|
| 2,400 × 1,200 | Walls and ceilings (the UK standard) |
| 2,700 × 1,200 | Higher ceilings, reducing joint count |
| 3,000 × 1,200 | Commercial / high-spec residential |
| 1,800 × 900 | Smaller areas, easier manual handling |
The 2,400 × 1,200 mm sheet is by far the most common — it is sized to span three standard timber stud centres (at 600 mm) or two joist spacings, minimising waste. Boards are typically sold per sheet or in packs of 30–60.
Thickness Options
Thickness affects both stiffness (important for ceilings) and fire resistance. Common thicknesses in the UK:
| Thickness | Typical Application |
|---|---|
| 9.5 mm | Lightweight ceilings, curved surfaces |
| 12.5 mm | Standard walls and ceilings (most common) |
| 15 mm | Floors, heavy-duty walls, improved fire resistance |
| 25 mm | Fire compartmentation, acoustic walls (two layers often preferred) |
For ceilings, 12.5 mm is the minimum sensible thickness at 600 mm joist centres; at 400 mm centres 9.5 mm is acceptable. Two layers of 12.5 mm outperform a single 25 mm sheet for both fire and acoustic performance and are easier to handle.
Board Types
Standard Plasterboard
The everyday workhorse — grey gypsum core with cream paper facing. Used for walls and ceilings in dry, conditioned spaces. Available in tapered-edge (for jointing and skimming) and square-edge formats.
Cost: approximately £5–£9 per 2,400 × 1,200 × 12.5 mm sheet (2026).
Moisture-Resistant Plasterboard (MR Board / Green Board)
Contains water-repellent additives in the gypsum core and has a green or blue paper facing. Suitable for bathrooms, kitchens, utility rooms, and other areas with intermittent moisture. It is not waterproof — it still requires tanking, tiles, or waterproof paint over it in wet zones. Building Regs (Approved Document C) effectively require moisture-resistant lining behind tiled shower enclosures and splash zones.
Cost: approximately £10–£16 per 2,400 × 1,200 × 12.5 mm sheet.
Fire-Rated Plasterboard (Type F / Pink Board)
Contains glass-fibre reinforcement and, in some products, vermiculite or other fire-resistant additives. Rated to provide 30 or 60 minutes of fire resistance depending on thickness and number of layers. Required by Building Regs (Approved Document B) for:
- Ceiling linings beneath loft conversions (30 min minimum)
- Garage ceilings and walls adjoining habitable rooms (30 min)
- Staircase enclosures forming the protected escape route
- Party walls and floors requiring fire compartmentation
The exact specification (single 15 mm, double 12.5 mm, etc.) depends on the application — always check with building control or an approved inspector.
Cost: approximately £12–£20 per 2,400 × 1,200 × 12.5 mm sheet.
Acoustic Plasterboard
A denser board — typically 12.5 mm or 15 mm — designed to increase the mass of a wall or ceiling and improve airborne sound insulation. Often used in party walls, between rooms, or on ceilings under noisy spaces. Acoustic performance improves significantly when combined with resilient bars (decoupling the board from the structure) and acoustic mineral wool between studs.
A single layer of acoustic board typically adds 3–5 dB improvement over standard board. Building Regs (Approved Document E) requires minimum performance standards for new builds and conversions between dwellings; acoustic board is usually part of the specification meeting these targets.
Cost: approximately £18–£28 per 2,400 × 1,200 × 15 mm sheet.
Thermal / Insulated Plasterboard (Dot-and-Dab)
A composite board: standard or fire-rated plasterboard bonded to a layer of rigid insulation foam (PIR or EPS). Used for internal wall insulation (dot-and-dab method) or on solid masonry walls. The insulation layer ranges from 20 mm to 90 mm+, with the plasterboard facing typically 12.5 mm.
Cost: £18–£55 per board depending on insulation thickness (higher PIR content costs more).
Impact-Resistant Plasterboard
A very dense, reinforced board used in high-traffic areas — school corridors, care homes, sports facilities — where the wall is likely to take knocks. Less common in domestic work but occasionally specified for hallways or stairwells in rental properties.
Tapered Edge vs Square Edge
Most modern plasterboard sold in the UK has a recessed (tapered) long edge, designed to be filled with joint compound and scrim tape to create a flush, seamless surface before skimming or direct decoration. Square-edge boards are used where the joints will be covered (e.g., behind tiles or panelling) or where skim coat is applied over the entire surface regardless.
For new build or renovation work with a skim-plaster finish, tapered-edge is the correct choice — it reduces the risk of visible joints telegraphing through the finished surface.
Cost Summary (2026 UK)
| Board Type | Thickness | Approx. Cost per Sheet |
|---|---|---|
| Standard | 9.5 mm | £4–£7 |
| Standard | 12.5 mm | £5–£9 |
| Standard | 15 mm | £8–£13 |
| Moisture-resistant | 12.5 mm | £10–£16 |
| Fire-rated | 12.5 mm | £12–£20 |
| Fire-rated | 15 mm | £15–£24 |
| Acoustic | 15 mm | £18–£28 |
| Insulated (PIR 40 mm + 12.5 mm board) | 52.5 mm | £22–£38 |
Prices vary by merchant and volume. Trade accounts at builders’ merchants (Buildbase, Jewson, Travis Perkins) typically offer 10–25% below list price compared with DIY sheds.
Practical Tips
Specify the right board for the location. Using standard board in a shower room or leaving fire-rated board out of a garage ceiling are both common — and potentially dangerous — errors.
Check joist and stud centres before ordering. The wrong sheet size relative to your stud spacing wastes material and adds unnecessary joints.
Handle carefully. Plasterboard sheets are heavy (a 2,400 × 1,200 × 12.5 mm standard sheet weighs about 19 kg) and corner damage is common. Order 5–10% extra to account for breakage and cuts.
Combine board types where needed. A party wall may need both fire-rated and acoustic performance — some manufacturers produce combination boards (fire + acoustic), which simplify the specification.
Choosing the right plasterboard from the outset prevents rework and ensures compliance with Building Regs. When in doubt about fire or acoustic requirements, a brief conversation with your local building control officer costs nothing and avoids expensive surprises later.
