Retrofit

Our expertise lies in providing advanced Retrofit solutions for both internal and external wall insulation, ensuring your home stays cosy while saving you money on energy bills.

With our wide range of wood fibre insulation, you can rely on year-round comfort. It keeps your house warm during chilly winters and pleasantly cool throughout the summer months.

Choose Insulation Merchant for a more comfortable, energy-efficient home that you'll love living in!

Retrofit Insulation | Insulation Merchant

Autumn Offers

View our Autumn deals and promotions across our range of products.
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Showing 119 of 119 products
  • 80m Pro Clima Duplex Double Sided Membrane Tape | Insulation Merchant
    DUPLEX by Pro Clima

    80m Pro Clima Duplex Double Sided Membrane Tape

    £28.82 per item
    £0.36 per LM (linear metre)
    inc. VAT
    £24.02 per item
    £0.30 per LM (linear metre)
    ex. VAT
    Save £-28.82
    £28.82 per item
    £0.36 per LM (linear metre)
    inc. VAT
    £0.00 Save £-24.02
    £24.02 per item
    £0.30 per LM (linear metre)
    ex. VAT
  • 5mm PROCTOR Spacetherm® A1 Fire Rated Silica Aerogel Blanket - 2400mm x 1200mm (2.88m²) | Insulation Merchant
    Sale 24%
    Autumn
    SPACETHERM® by A. Proctor Group

    PROCTOR Spacetherm® A1 Fire Rated Silica Aerogel Blanket - 2400mm x 1200mm (2.88m²)

    From £240.61 per item
    £83.55 per m²
    inc. VAT
    From £200.51 per item
    £69.62 per m²
    ex. VAT
    £320.01 Save £79.40
    From £240.61 per item
    £83.55 per m²
    inc. VAT
    £266.68 Save £66.17
    From £200.51 per item
    £69.62 per m²
    ex. VAT
  • 25mm SKANDA Savolit Plus Wood Wool Board - 1200 x 600mm | Insulation Merchant

    5.0

    SAVOLIT PLUS - 1200MM by Skanda Savolit

    25mm SKANDA Savolit Plus Wood Wool Board - 1200 x 600mm

    £12.49 per item
    £17.35 per m²
    inc. VAT
    £10.41 per item
    £14.46 per m²
    ex. VAT
    Save £-12.49
    £12.49 per item
    £17.35 per m²
    inc. VAT
    £0.00 Save £-10.41
    £10.41 per item
    £14.46 per m²
    ex. VAT
  • 20mm STEICO Therm SD (wet) - 600mm x 1350mm - per board | Insulation Merchant
    New
    THERM SD (WET) by Steico

    STEICO Therm SD (wet)

    From £5.30 per item
    £6.54 per m²
    inc. VAT
    From £4.42 per item
    £5.45 per m²
    ex. VAT
    Save £-5.30
    From £5.30 per item
    £6.54 per m²
    inc. VAT
    £0.00 Save £-4.42
    From £4.42 per item
    £5.45 per m²
    ex. VAT
  • CEWOOD Wood Wool Multi-purpose Board - Square Edge | Insulation Merchant
    Autumn
    MULTI-PURPOSE by Cewood

    CEWOOD Wood Wool Multi-purpose Board - Square Edge

    From £9.99 per item
    £13.88 per m²
    inc. VAT
    From £8.33 per item
    £11.56 per m²
    ex. VAT
    Save £-9.99
    From £9.99 per item
    £13.88 per m²
    inc. VAT
    £0.00 Save £-8.33
    From £8.33 per item
    £11.56 per m²
    ex. VAT
  • ULTIMATE Value Wood Wool Building Board | Insulation Merchant
    Sale 10%
    Autumn
    BUILDING BOARD by Cewood

    ULTIMATE Value Wood Wool Building Board

    From £7.15 per item
    £9.93 per m²
    inc. VAT
    From £5.96 per item
    £8.28 per m²
    ex. VAT
    £7.95 Save £0.80
    From £7.15 per item
    £9.93 per m²
    inc. VAT
    £6.63 Save £0.67
    From £5.96 per item
    £8.28 per m²
    ex. VAT
  • 75mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant

    5.0

    COSYWOOL by Thermafleece

    75mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls)

    £109.09 per item
    £11.26 per m²
    inc. VAT
    £90.91 per item
    £9.38 per m²
    ex. VAT
    Save £-109.09
    £109.09 per item
    £11.26 per m²
    inc. VAT
    £0.00 Save £-90.91
    £90.91 per item
    £9.38 per m²
    ex. VAT
  • ADAPTAVATE breathAplasta Thermal (Insulating Breathable Plaster) - 9kg bag | Insulation Merchant

    5.0

    THERMAL by Adaptavate

    ADAPTAVATE breathAplasta Thermal (Insulating Breathable Plaster) - 9kg bag

    £23.94 per item
    £23.94 per m²
    inc. VAT
    £19.95 per item
    £19.95 per m²
    ex. VAT
    £23.10 Save £-0.84
    £23.94 per item
    £23.94 per m²
    inc. VAT
    £19.25 Save £-0.70
    £19.95 per item
    £19.95 per m²
    ex. VAT
  • 140mm Thermafleece CosyWool Sheep Wool (3 x 370mm rolls) | Insulation Merchant

    5.0

    COSYWOOL by Thermafleece

    140mm Thermafleece CosyWool Sheep Wool (3 x 370mm rolls)

    £107.63 per item
    £21.06 per m²
    inc. VAT
    £89.69 per item
    £17.55 per m²
    ex. VAT
    Save £-107.63
    £107.63 per item
    £21.06 per m²
    inc. VAT
    £0.00 Save £-89.69
    £89.69 per item
    £17.55 per m²
    ex. VAT
  • SIGA Majcoat® 200 SOB Diffusion Open Roof Breather Membrane - 1.5m x 50m | Insulation Merchant
    MAJCOAT® by SIGA

    SIGA Majcoat® 200 SOB Diffusion Open Roof Breather Membrane - 1.5m x 50m

    £317.65 per item
    £4.23 per m²
    inc. VAT
    £264.71 per item
    £3.53 per m²
    ex. VAT
    Save £-317.65
    £317.65 per item
    £4.23 per m²
    inc. VAT
    £0.00 Save £-264.71
    £264.71 per item
    £3.53 per m²
    ex. VAT
  • SIGA Majrex® 200 (1-directional) Airtight Humidity Vapour Control Layer - 1.5 x 50m (75m²) | Insulation Merchant
    MAJREX® by SIGA

    SIGA Majrex® 200 (1-directional) Airtight Humidity Vapour Control Layer - 1.5 x 50m (75m²)

    £380.90 per item
    £5.07 per m²
    inc. VAT
    £317.42 per item
    £4.23 per m²
    ex. VAT
    Save £-380.90
    £380.90 per item
    £5.07 per m²
    inc. VAT
    £0.00 Save £-317.42
    £317.42 per item
    £4.23 per m²
    ex. VAT
  • 40mm STEICO Therm (wet) - 600mm x 1350mm - per board | Insulation Merchant
    THERM (WET) by Steico

    40mm STEICO Therm (wet) - 600mm x 1350mm - per board

    This product is not available.

    Enquire for more information and advice.

  • 40mm STEICOduo Dry - 600mm x 2230mm | Insulation Merchant

    5.0

    DUO DRY by Steico

    40mm STEICOduo Dry - 600mm x 2230mm

    This product is not available.

    Enquire for more information and advice.

  • SIGA Majpell® 5 Vapour Control Layer - 1.5 x 50m (75m²) | Insulation Merchant
    MAJPELL® by SIGA

    SIGA Majpell® 5 Vapour Control Layer - 1.5 x 50m (75m²)

    £233.70 per item
    £3.11 per m²
    inc. VAT
    £194.75 per item
    £2.60 per m²
    ex. VAT
    Save £-233.70
    £233.70 per item
    £3.11 per m²
    inc. VAT
    £0.00 Save £-194.75
    £194.75 per item
    £2.60 per m²
    ex. VAT
  • 140mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant
    COSYWOOL by Thermafleece

    140mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls)

    £110.32 per item
    £21.05 per m²
    inc. VAT
    £91.93 per item
    £17.54 per m²
    ex. VAT
    Save £-110.32
    £110.32 per item
    £21.05 per m²
    inc. VAT
    £0.00 Save £-91.93
    £91.93 per item
    £17.54 per m²
    ex. VAT
  • 25mm SKANDA Savolit Plus Wood Wool Board - 2400 x 600mm | Insulation Merchant
    SAVOLIT PLUS - 2400MM by Skanda Savolit

    25mm SKANDA Savolit Plus Wood Wool Board - 2400 x 600mm

    £24.90 per item
    £17.29 per m²
    inc. VAT
    £20.75 per item
    £14.41 per m²
    ex. VAT
    Save £-24.90
    £24.90 per item
    £17.29 per m²
    inc. VAT
    £0.00 Save £-20.75
    £20.75 per item
    £14.41 per m²
    ex. VAT
  • STEICO Internal (wet)
    INTERNAL (WET) by Steico

    STEICO Internal (wet)

    From £6.70 per item
    £14.69 per m²
    inc. VAT
    From £5.58 per item
    £12.24 per m²
    ex. VAT
    £0.00 Save £-6.70
    From £6.70 per item
    £14.69 per m²
    inc. VAT
    £0.00 Save £-5.58
    From £5.58 per item
    £12.24 per m²
    ex. VAT
  • SIGA Fentrim® grommet (White) - Internal Airtight Cable & Pipe Sealing | Insulation Merchant
    FENTRIM® by SIGA

    SIGA Fentrim® grommet (White) - Internal Airtight Cable & Pipe Sealing

    From £4.30 per item
    inc. VAT
    From £3.58 per item
    ex. VAT
    Save £-4.30
    From £4.30 per item
    inc. VAT
    £0.00 Save £-3.58
    From £3.58 per item
    ex. VAT
  • SIGA Fentrim® grommet (Black) - External Airtight Cable & Pipe Sealing | Insulation Merchant
    FENTRIM® by SIGA

    SIGA Fentrim® grommet (Black) - External Airtight Cable & Pipe Sealing

    From £4.30 per item
    inc. VAT
    From £3.58 per item
    ex. VAT
    Save £-4.30
    From £4.30 per item
    inc. VAT
    £0.00 Save £-3.58
    From £3.58 per item
    ex. VAT
  • Pro Clima Contega Solido SL-D80 (External Double-sIded Corner Adhesive Tape) - 80mm x 30m | Insulation Merchant
    CONTEGA by Pro Clima

    Pro Clima Contega Solido SL-D80 (External Double-sIded Corner Adhesive Tape) - 80mm x 30m

    £72.68 per item
    £2.42 per LM (linear metre)
    inc. VAT
    £60.57 per item
    £2.02 per LM (linear metre)
    ex. VAT
    Save £-72.68
    £72.68 per item
    £2.42 per LM (linear metre)
    inc. VAT
    £0.00 Save £-60.57
    £60.57 per item
    £2.02 per LM (linear metre)
    ex. VAT