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External Wall Insulation
External wall insulation is fitted on outside walls. It is mainly used on solid wall systems, as well as properties constructed with steel or timber frames. It is ideal for buildings where internal insulation is impractical or space is limited.
What is external wall insulation?
This specialised insulation forms a thermal envelope around the building to prevent heat from dissipating through the walls. It typically includes an insulation layer for thermal performance, followed by a reinforced base coat and decorative render for weather protection
What is external wall insulation used for?
Exterior wall insulation is used to:
- Boost energy efficiency in buildings.
- Protect walls from rain penetration and temperature fluctuations.
- Enhance comfort levels in cold or draughty homes.
- Lower heating costs.
- Refurbish old or weathered façades.
- Can improve property value by increasing energy efficiency ratings.
Types of external insulation for house
We offer these external house insulation systems for different wall systems:
Cavity wall insulation
These are used mainly for hybrid wall systems where an external insulation layer is added to enhance existing cavity performance
Rainscreen insulation
These allow insulation behind ventilated cladding. They protect the wall from wind and rain, while ensuring moisture can still escape. Commonly used on commercial buildings and high-rise façades.
Solid wall insulation
This is the most common form of external insulation for solid wall retrofits. It is applied to properties without a cavity wall. It ensures you have a continuous insulation layer over masonry.
Timber frame insulation
This provides continuous external insulation across the entire frame in buildings with structured timber walls.
Each system has its own design, moisture, and structural considerations, so pick one suited to your wall type and site conditions.
Benefits of external wall insulation
Exterior wall insulation has multiple benefits:
- Significant reduction of heat loss.
- Reduced condensation.
- Weather protection for your walls.
- Noise reduction.
- Better-looking facade.
- Lower energy bills.
- Higher property value.
- Extends wall lifespan by shielding masonry from freeze-thaw cycles.
Why choose our wall insulation for the exterior?
Here’s why Insulation Wholesale is a trusted supplier for outside wall insulation systems:
- Wide range of mineral wool, PIR insulation and EPS insulation options available.
- Products from top brands with proven thermal performance.
- All materials meet Building Regulations and energy standards.
- Professional advice and technical support available.
- Competitive prices and bulk order discounts.
- Fast and reliable nationwide delivery (1-3 days on all products unless otherwise stated).
Transform your home’s comfort and efficiency today. Shop external wall insulation for great prices, expert support, and fast UK delivery.
At Insulation Wholesale, you can purchase External Wall Insulation at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.
FAQ
How to install external wall insulation?
Before installation, ensure walls are clean, dry, and structurally sound. Installation should be done by qualified professionals.
Secure the insulant to your external walls using adhesives and mechanical fixings. Apply a reinforced base coat with mesh, then finish with a decorative render.
Will external wall insulation stop condensation?
Yes, the insulating material keeps the interior wall warmer, reducing the likelihood of moisture build-up inside the wall. However, you still need sufficient ventilation to manage indoor humidity and prevent mould growth.
Where to buy external wall insulation?
You can buy insulation systems for exterior walls directly from Insulation Wholesale. We stock a full range of EPS, PIR, and mineral wool for external home insulation, plus accessories like fixings, mesh, and render.
How much does external wall insulation cost?
External wall insulation cost depends on the material and wall area. For materials only, prices typically range from £15–£50 per m² (EPS on the lower end, PIR and mineral wool on the higher). When you factor in professional installation costs, you could spend between £80 and £120 per square metre.
External Wall Insulation Range
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100mm Celotex CW4100 Cavity Wall Insulation Board 1200mm x 450mm 3.24m2 Pack of 6 (3.24m2)
100mm Celotex CW4100 Cavity Wall Insulation Board is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing.
£62.06£74.47 Ex VATInc VAT£19.15£22.98 Per M2 Add to cart -
100mm Celotex GA4100 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
100mm Celotex GA4100 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£36.42£43.70 Ex VATInc VAT£12.65£15.18 Per M2 Add to cart -
100mm Ecotherm Eco-Versal Rigid PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
100mm Ecotherm Eco-Versal is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Ecotherm Eco-Versal is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£40.34£48.41 Ex VATInc VAT£14.01£16.81 Per M2 Add to cart -
100mm Isover CWS 32 Cavity Wall Slab 3.28m2 Pack
100mm Isover CWS 32 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£37.84£45.41 Ex VATInc VAT£11.54£13.85 Per m2 Add to cart -
100mm Isover CWS 36 Cavity Wall Slab 6.55m2 Pack
100mm Isover CWS 36 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£36.99£44.39 Ex VATInc VAT£5.65£6.78 Per m2 Add to cart -
100mm Jablite HP+ 70E External Wall Insulation Board 1200mm x 600mm (4′ X 2′) Pack of 6 (4.32m2)
100mm Jablite HP+ 70E External Wall Insulation Board is designed to enhance thermal efficiency for external walls. It can be bonded or mechanically fixed, providing reliable insulation solution.
£54.70£65.64 Ex VATInc VAT£12.66£15.19 Per M2 Add to cart -
100mm Kingspan Kooltherm K108 Cavity Board Insulation 1200mm x 450mm Pack of 5 (2.70m2)
100mm Kingspan Kooltherm K108 partial fill cavity wall board is a premium performance lower lambda insulation with a rigid thermoset fibre-free phenolic core. It is faced on both sides with a low emissivity composite foil facing and is used in partially filled cavity walls.
£113.62£136.34 Ex VATInc VAT£42.08£50.50 Per M2 Add to cart -
100mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
100mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£36.78£44.14 Ex VATInc VAT£12.77£15.32 Per M2 Add to cart -
100mm Recticel Eurowall Partial Cavity Wall Insulation Board 1200mm x 450mm Pack of 10 (5.40m2)
100mm Recticel Eurowall Partial Cavity is an advanced thermal insulation panel tailored for use in cavity wall systems, delivering exceptional energy efficiency and robust performance.
£110.29£132.35 Ex VATInc VAT£20.42£24.50 Per M2 Add to cart -
100mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 4.32m2 Pack
100mm Rockwool Flexi has been designed as a multi-use, dual-purpose acoustic and thermal mineral wool insulation with a unique flexible edge along one side. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.
£43.36£52.03 Ex VATInc VAT£10.04£12.05 Per m2 Add to cart -
100mm URSA Party Wall Roll 5.46m2
100mm URSA Party Wall Roll is a high-density insulation that helps reduce noise transfer between connecting walls, creating quieter spaces in both homes and commercial buildings.
£52.38£62.86 Ex VATInc VAT£9.59£11.51 Per m2 Add to cart -
110mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
110mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£44.93£53.92 Ex VATInc VAT£15.60£18.72 Per M2 Add to cart -
110mm Unilin Thin-R PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pallet of 21 (60.48m2)
110mm Unilin Thin-R PIR insulation is a foil faced, high-performance insulation solution that offers exceptional thermal efficiency and durability. This polyisocyanurate insulation board, formerly known as Xtratherm, is ideal for a range of applications, such as floors, pitched roofs, and walls.
POA Get a quote -
115mm Celotex Thermaclass Cavity Wall 21 Insulation Board 1190mm x 450mm Pack of 5 (2.67m2)
115mm Celotex Thermaclass Cavity Wall 21 is a PIR T&G insulation board designed for full-fill cavity wall applications. Low-emissivity foil facing provides versatility during installation, allowing for a 10mm residual cavity.
£137.98£165.58 Ex VATInc VAT£51.68£62.02 Per M2 Add to cart -
115mm Kingspan Kooltherm K106 Cavity Board Insulation 1200mm x 450mm Pack of 4 (2.16m2)
115mm Kingspan Kooltherm K106 Cavity Board is a premium performance insulation with a fibre-free rigid thermoset phenolic core with a thermal conductivity of just 0.019 W/mK across all thicknesses.
£113.03£135.64 Ex VATInc VAT£52.33£62.80 Per M2 Add to cart -
115mm Recticel Eurowall Full Fill Cavity Wall Insulation Board 1200mm x 460mm Pack of 8 (4.41m2)
115mm Recticel Eurowall Full Fill boards snap together with interlocking edges, forming a continuous thermal barrier that optimises performance of cavity wall insulation.
£122.96£147.55 Ex VATInc VAT£27.88£33.46 Per M2 Add to cart -
120mm Celotex XR4120 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
120mm Celotex XR4120 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£45.88£55.06 Ex VATInc VAT£15.93£19.12 Per M2 Add to cart -
120mm Ecotherm Eco-Versal Rigid PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
120mm Ecotherm Eco-Versal is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Ecotherm Eco-Versal is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£50.68£60.82 Ex VATInc VAT£17.60£21.12 Per M2 Add to cart -
120mm Kingspan Kooltherm K112 Framing Insulation Board 2400mm x 1200mm Pack of 2 (5.76m2)
120mm Kingspan Kooltherm K112 Framing Board is a premium performance insulation with a fibre-free rigid thermoset phenolic core. It is used to insulate timber and steel framing systems with thermal conductivity of just 0.019 W/mK across all thicknesses.
£333.92£400.70 Ex VATInc VAT£57.97£69.56 Per M2 Add to cart -
120mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
120mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£45.36£54.43 Ex VATInc VAT£15.75£18.90 Per M2 Add to cart -
125mm Isover CWS 32 Cavity Wall Slab 2.73m2 Pack
125mm Isover CWS 32 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£39.37£47.24 Ex VATInc VAT£14.42£17.30 Per m2 Add to cart -
125mm Isover CWS 36 Cavity Wall Slab 4.37m2 Pack
125mm Isover CWS 36 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£34.43£41.32 Ex VATInc VAT£7.88£9.46 Per m2 Add to cart -
130mm Celotex XR4130 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
130mm Celotex XR4130 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£60.18£72.22 Ex VATInc VAT£20.90£25.08 Per M2 Add to cart -
140mm Celotex XR4140 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
140mm Celotex XR4140 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£56.81£68.17 Ex VATInc VAT£19.73£23.68 Per M2 Add to cart -
140mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
140mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£52.57£63.08 Ex VATInc VAT£18.25£21.90 Per M2 Add to cart -
140mm Recticel Eurowall Full Fill Cavity Wall Insulation Board 1200mm x 460mm Pack of 8 (4.41m2)
140mm Recticel Eurowall Full Fill boards snap together with interlocking edges, forming a continuous thermal barrier that optimises performance of cavity wall insulation.
£150.09£180.11 Ex VATInc VAT£34.03£40.84 Per M2 Add to cart -
140mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 2.88m2 Pack
140mm Rockwool Flexi has been designed as a multi-use, dual-purpose acoustic and thermal mineral wool insulation with a unique flexible edge along one side. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.
£42.01£50.41 Ex VATInc VAT£14.59£17.51 Per m2 Add to cart -
150mm Celotex XR4150 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
150mm Celotex XR4150 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£54.96£65.95 Ex VATInc VAT£19.08£22.90 Per M2 Add to cart -
150mm Ecotherm Eco-Versal Rigid PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
The 150mm Ecotherm Eco-Versal is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Ecotherm Eco-Versal is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£60.22£72.26 Ex VATInc VAT£20.91£25.09 Per M2 Add to cart -
150mm Isover CWS 32 Cavity Wall Slab 2.18m2 Pack
150mm Isover CWS 32 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£37.84£45.41 Ex VATInc VAT£17.36£20.83 Per m2 Add to cart -
150mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
150mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£52.98£63.58 Ex VATInc VAT£18.40£22.08 Per M2 Add to cart -
20mm Jablite HP+ 70E External Wall Insulation Board 1200mm x 600mm (4′ X 2′) Pack of 30 (21.60m2)
20mm Jablite HP+ 70E External Wall Insulation Board is designed to enhance thermal efficiency for external walls. It can be bonded or mechanically fixed, providing reliable insulation solution.
£54.07£64.88 Ex VATInc VAT£2.50£3.00 Per M2 Add to cart -
25mm Celotex PIR Insulated Plasterboard 1200mm x 2400mm + 12.5mm P/B 2.88m2
25mm + 12.5mm Celotex PL4025 PIR Insulated Plasterboard is it is suitable for use in roof and internal wall lining applications. Celotex Insulated Plasterboard is a high performance, easy to install PIR insulation board with a paper facing, laminated to a piece of 12.5mm tapered edge plasterboard.
£41.49£49.79 Ex VATInc VAT£14.41£17.29 Per M2 Add to cart -
25mm Celotex TB4025 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
25mm Celotex TB4025 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£13.87£16.64 Ex VATInc VAT£4.82£5.78 Per M2 Add to cart -
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1-34 35+ £42.66£51.19 £41.81£50.17 
25mm Mannok PIR Insulated Plasterboard 1200mm x 2400mm + 12.5mm P/B 2.88m2
Mannok Therm Laminate-Kraft / MLK PIR 25mm + 12.5mm PIR Insulated plasterboard is a high performance, fibre-free insulated board. Mannok Therm Laminate-Kraft / MLK PIR has a kraft paper facing on one side and plasterboard bonded to the other side.
£42.66£51.19 Ex VATInc VAT£14.81£17.77 Per M2 Add to cart -
25mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
25mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£13.96£16.75 Ex VATInc VAT£4.85£5.82 Per M2 Add to cart
