Best Insulation Boards 25mm Deals Online in the UK (10 Deals Found)

Last Updated - 14/09/2026 Sort By:

Best Choice
Triplast

New
Triplast Expanded Polystyrene Foam Sheets EPS 70 (12 Sheets, 1200 x 600 x 25mm Each) - BBA Certified Wall & Floor Insula
CONTENTS: 12 x Polystyrene Sheets | SIZE: Each square-edged sheet measures 1200mm (Length) x 600mm (Width) x 25mm (Heigh

£42.99
Best Value
STORM TRADING GROUP

New
10 x White Rigid Polystyrene Foam Sheets 600mm Long x 400mm Wide x 25mm Boards Slabs Thick EPS70 SDN Floor Insulation Sh
STRONG EPS FOAM SHEETS: Expanded White Polystyrene Foam Sheets (EPS) White Rigid EPS70 SDN Floor Insulation Sheeting - P

£15.65
Triplast

New
Triplast Expanded Polystyrene Foam Sheets EPS 70 (24 Sheets, 1200 x 600 x 25mm Each) - BBA Certified Wall & Floor Insula
CONTENTS: 24 x Polystyrene Sheets | SIZE: Each square-edged sheet measures 1200mm (Length) x 600mm (Width) x 25mm (Heigh

£69.79
Triplast

New
Triplast Expanded Polystyrene Foam Sheets EPS 70 (10 Sheets, 600 x 400 x 25mm Each) - BBA Certified Wall & Floor Insulat
CONTENTS: 10 x Polystyrene Sheets | SIZE: Each square-edged sheet measures 600mm (Length) x 400mm (Width) x 25mm (Height

£18.59
Pluto Packaging

New
Pack of 10 Thick White Rigid Polystyrene Foam Sheets 600x400x25mm Insulation Void Filling Slabs
Size/Dimensions: 600mm x 400mm x 25mm You Will Receive 10

£16.00
STAR SUPPLIES

New
10 x 600x400x25mm White Rigid Flexible Foam Sheet Slabs Thick EPS70 SDN Void Filling Insulation Sheets
Our white thick rigid polystyrene foam sheets are soft flexible foam sheets designed to wrap around and cushion fragile

£13.00
Pluto Packaging

New
Rigid Polystyrene Foam Sheets White Board Slabs - Size 600mm Long x 400mm Wide x 25mm Thick - EPS70 SDN Floor Insulation
Polystyrene Foam Sheets 600mm x 400mm x 25mm

£28.54
LOWENERGIE

New
Jablite 25mm Multi Purpose Insulation Boards Floor Wall Roof & Underfloor Heating (12)
Jablite HP (High Performance) is a closed cell expanded polystyrene (EPS) multi-use insulation board suitable for a wide

£36.49
ASTON BUILDING SUPPLIES LTD

New
Rockwool RWA45 Acoustic Insulation 25mm Slab1200mm x 600 16 Pieces Per Pack (11.52m2/Pack)
🔹 Multiple Thickness Options Available Available in 25mm, 50mm, 75mm, and 100mm to suit a wide range of applications: 2

£69.99
LOWENERGIE

New
25mm Multi-Purpose Jabite Insulation Boards – Pack of 9 | Thermal Foam Panels for Floor, Wall, Roof & Underfloor Heating
Superior Thermal Insulation Provides excellent heat retention and energy efficiency for floors, walls, and roofs — helpi

£28.49

10 Insulation Boards 25mm deals are available from: Amazon stores, starting from £13.00.
The biggest discount we found is 10%% on Triplast Expanded Polystyrene Foam Sheets EPS 70 (12 Sheets, 1200 x 600 x 25mm Each) - BBA Certified Wall & Floor Insulation Board - Box Lining & Packaging Foam Board - White Blocks for DIY Projects at Amazon.
The lowest price we found is £13.00 while the highest is £69.99.
Prices for the best Insulation Boards 25mm deals average at £33.95.
Last updated on September 14, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Insulation Boards 25mm.