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
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  • Pro Clima Contega Solido SL-D80 (External Double-sIded Corner Adhesive Tape) - 80mm x 30m | Insulation Merchant Pro Clima Contega Solido SL-D80 (External Double-sIded Corner Adhesive Tape) - 80mm x 30m | Insulation Merchant
    Sale
    CONTEGA SOLIDO SL-D by Pro Clima

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

    £66.40 inc. VAT
    £2.21 per LM (linear metre)
    £55.33 ex. VAT
    £1.84 per LM (linear metre)
    £66.40 inc. VAT
    £2.21 per LM (linear metre)
    £68.16 Save £1.76
    £55.33 ex. VAT
    £1.84 per LM (linear metre)
    £56.80 Save £1.47
  • 60mm STEICO Therm (wet) - 600mm x 1350mm - per board | Insulation Merchant 60mm STEICO Therm (wet) - 600mm x 1350mm - per board | Insulation Merchant
    Sale 9%
    Spring Savings
    THERM WET by Steico

    60mm STEICO Therm (wet) - 600mm x 1350mm - per board

    £13.02 inc. VAT
    £10.85 ex. VAT
    £13.02 inc. VAT
    £14.32 Save £1.30
    £10.85 ex. VAT
    £11.93 Save £1.08
  • Pro Clima Contega Solido SL150 (Internal Single-sIded Corner Adhesive Tape) - 150mm x 30m | Insulation Merchant Pro Clima Contega Solido SL150 (Internal Single-sIded Corner Adhesive Tape) - 150mm x 30m | Insulation Merchant
    Sale
    CONTEGA SOLIDO SL by Pro Clima

    Pro Clima Contega Solido SL150 (Internal Single-sIded Corner Adhesive Tape) - 150mm x 30m

    £88.90 inc. VAT
    £2.96 per LM (linear metre)
    £74.08 ex. VAT
    £2.47 per LM (linear metre)
    £88.90 inc. VAT
    £2.96 per LM (linear metre)
    £91.32 Save £2.42
    £74.08 ex. VAT
    £2.47 per LM (linear metre)
    £76.10 Save £2.02
  • SIGA Fentrim® grommet (Black) - External Airtight Cable & Pipe Sealing | Insulation Merchant SIGA Fentrim® grommet (Black) - External Airtight Cable & Pipe Sealing | Insulation Merchant
    Spring Savings
    FENTRIM® GROMMET by SIGA

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

    From £4.30 inc. VAT
    From £3.58 ex. VAT
    From £4.30 inc. VAT
    Save £-4.30
    From £3.58 ex. VAT
    £0.00 Save £-3.58
  • SIGA Majvest® 700 SOB - Open Facade Membrane (1.5m x 33.4m) | Insulation Merchant SIGA Majvest® 700 SOB - Open Facade Membrane (1.5m x 33.4m) | Insulation Merchant
    Spring Savings
    MAJVEST® 700 SOB by SIGA

    SIGA Majvest® 700 SOB - Open Facade Membrane (1.5m x 33.4m)

    £327.15 inc. VAT
    £6.53 per m²
    £272.63 ex. VAT
    £5.44 per m²
    £327.15 inc. VAT
    £6.53 per m²
    Save £-327.15
    £272.63 ex. VAT
    £5.44 per m²
    £0.00 Save £-272.63
  • 60mm STEICOduo Dry - 600mm x 2230mm | Insulation Merchant
    Sale 9%
    Spring Savings
    DUO DRY by Steico

    60mm STEICOduo Dry - 600mm x 2230mm

    £31.51 inc. VAT
    £23.55 per m²
    £26.26 ex. VAT
    £19.63 per m²
    £31.51 inc. VAT
    £23.55 per m²
    £34.66 Save £3.15
    £26.26 ex. VAT
    £19.63 per m²
    £28.88 Save £2.63
  • 100mm Thermafleece Supasoft Insulation (2 x 590mm rolls) - 5.90m² | Insulation Merchant 100mm Thermafleece Supasoft Insulation (2 x 590mm rolls) - 5.90m² | Insulation Merchant

    5.0

    SUPASOFT by Thermafleece

    100mm Thermafleece Supasoft Insulation (2 x 590mm rolls) - 5.90m²

    £ Looking for a price?

    Add to a quote for our best rate.

  • SIGA Majvest® 200 - Breather Membrane (Particularly for Closed Facade) | Insulation Merchant SIGA Majvest® 200 - Breather Membrane (Particularly for Closed Facade) | Insulation Merchant
    Spring Savings
    MAJVEST® 200 by SIGA

    SIGA Majvest® 200 - Breather Membrane (Particularly for Closed Facade)

    £195.45 inc. VAT
    £2.60 per m²
    £162.88 ex. VAT
    £2.17 per m²
    £195.45 inc. VAT
    £2.60 per m²
    Save £-195.45
    £162.88 ex. VAT
    £2.17 per m²
    £0.00 Save £-162.88
  • SIGA Fentrim® IS 20 (Pre-folded Internal Corner Tape) - All sizes | Insulation Merchant SIGA Fentrim® IS 20 (Pre-folded Internal Corner Tape) - All sizes | Insulation Merchant
    Spring Savings
    Internal Use
    FENTRIM® IS 20 by SIGA

    SIGA Fentrim® IS 20 (Pre-folded Internal Corner Tape) - All sizes

    From £54.05 inc. VAT
    £2.16 per LM (linear metre)
    From £45.04 ex. VAT
    £1.80 per LM (linear metre)
    From £54.05 inc. VAT
    £2.16 per LM (linear metre)
    Save £-54.05
    From £45.04 ex. VAT
    £1.80 per LM (linear metre)
    £0.00 Save £-45.04
  • SIGA Fentrim® grommet (White) - Internal Airtight Cable & Pipe Sealing | Insulation Merchant SIGA Fentrim® grommet (White) - Internal Airtight Cable & Pipe Sealing | Insulation Merchant
    Spring Savings
    FENTRIM® GROMMET by SIGA

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

    From £4.30 inc. VAT
    From £3.58 ex. VAT
    From £4.30 inc. VAT
    Save £-4.30
    From £3.58 ex. VAT
    £0.00 Save £-3.58
  • 120mm STEICO Special Dry 600mm x 1880mm - per board | Insulation Merchant 120mm STEICO Special Dry 600mm x 1880mm - per board | Insulation Merchant
    Sale 9%
    Spring Savings
    SPECIAL DRY by Steico

    120mm STEICO Special Dry 600mm x 1880mm - per board

    £46.84 inc. VAT
    £43.90 per m²
    £39.03 ex. VAT
    £36.58 per m²
    £46.84 inc. VAT
    £43.90 per m²
    £52.04 Save £5.20
    £39.03 ex. VAT
    £36.58 per m²
    £43.37 Save £4.33
  • SIGA Corvum® 12/48 Pre-folded Corner Adhesive Tape (60mm x 25m) | Insulation Merchant SIGA Corvum® 12/48 Pre-folded Corner Adhesive Tape (60mm x 25m) | Insulation Merchant
    Spring Savings
    CORVUM® by SIGA

    SIGA Corvum® 12/48 Pre-folded Corner Adhesive Tape (60mm x 25m)

    £49.25 inc. VAT
    £1.97 per LM (linear metre)
    £41.04 ex. VAT
    £1.64 per LM (linear metre)
    £49.25 inc. VAT
    £1.97 per LM (linear metre)
    Save £-49.25
    £41.04 ex. VAT
    £1.64 per LM (linear metre)
    £0.00 Save £-41.04
  • 100mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant
    COSYWOOL by Thermafleece

    25mm Thermafleece CosyWool Sheep Wool (1 x 370mm roll)

    £22.50 inc. VAT
    £5.07 per m²
    £18.75 ex. VAT
    £4.22 per m²
    £22.50 inc. VAT
    £5.07 per m²
    £22.50 Save £0.00
    £18.75 ex. VAT
    £4.22 per m²
    £18.75 Save £0.00
  • 80mm STEICO Therm (wet) - 600mm x 1350mm - per board | Insulation Merchant 80mm STEICO Therm (wet) - 600mm x 1350mm - per board | Insulation Merchant
    Sale 10%
    Spring Savings

    5.0

    THERM WET by Steico

    80mm STEICO Therm (wet) - 600mm x 1350mm - per board

    £18.59 inc. VAT
    £15.49 ex. VAT
    £18.59 inc. VAT
    £20.66 Save £2.07
    £15.49 ex. VAT
    £17.22 Save £1.73
  • 5mm PROCTOR Spacetherm® A1 Fire Rated Silica Aerogel Blanket - 2400mm x 1200mm (2.88m²) | Insulation Merchant
    SPACETHERM® by A. Proctor Group

    5mm PROCTOR Spacetherm® A1 Fire Rated Silica Aerogel Blanket - 2400mm x 1200mm (2.88m²)

    £214.60 inc. VAT
    £74.51 per m²
    £178.83 ex. VAT
    £62.09 per m²
    £214.60 inc. VAT
    £74.51 per m²
    Save £-214.60
    £178.83 ex. VAT
    £62.09 per m²
    £0.00 Save £-178.83
  • SIGA Corvum® 30/30 - Pre-folded Corner Adhesive Tape (60mm x 25m) | Insulation Merchant SIGA Corvum® 30/30 - Pre-folded Corner Adhesive Tape (60mm x 25m) | Insulation Merchant
    Spring Savings
    CORVUM® by SIGA

    SIGA Corvum® 30/30 - Pre-folded Corner Adhesive Tape (60mm x 25m)

    £49.25 inc. VAT
    £1.97 per LM (linear metre)
    £41.04 ex. VAT
    £1.64 per LM (linear metre)
    £49.25 inc. VAT
    £1.97 per LM (linear metre)
    Save £-49.25
    £41.04 ex. VAT
    £1.64 per LM (linear metre)
    £0.00 Save £-41.04
  • 100mm STEICO Therm (wet)- 600mm x 1350mm - per board | Insulation Merchant 100mm STEICO Therm (wet)- 600mm x 1350mm - per board | Insulation Merchant
    Sale 9%
    Spring Savings
    THERM WET by Steico

    100mm STEICO Therm (wet)- 600mm x 1350mm - per board

    £21.73 inc. VAT
    £18.11 ex. VAT
    £21.73 inc. VAT
    £24.14 Save £2.41
    £18.11 ex. VAT
    £20.12 Save £2.01
  • 100mm Thermafleece CosyWool Sheep Wool (2 x 570mm rolls) | Insulation Merchant
    COSYWOOL by Thermafleece

    25mm Thermafleece CosyWool Sheep Wool (1 x 570mm roll)

    £34.65 inc. VAT
    £5.07 per m²
    £28.88 ex. VAT
    £4.22 per m²
    £34.65 inc. VAT
    £5.07 per m²
    £34.65 Save £0.00
    £28.88 ex. VAT
    £4.22 per m²
    £28.88 Save £0.00
  • SIGA Fentrim® 20 50/85 (Pre-folded Internal Corner Tape) - 25m | Insulation Merchant SIGA Fentrim® 20 50/85 (Pre-folded Internal Corner Tape) - 25m | Insulation Merchant
    Spring Savings
    FENTRIM® 20 by SIGA

    SIGA Fentrim® 20 50/85 (Pre-folded Internal Corner Tape) - 25m

    £87.40 inc. VAT
    £3.49 per LM (linear metre)
    £72.83 ex. VAT
    £2.91 per LM (linear metre)
    £87.40 inc. VAT
    £3.49 per LM (linear metre)
    Save £-87.40
    £72.83 ex. VAT
    £2.91 per LM (linear metre)
    £0.00 Save £-72.83
  • 3m Pro Clima Intello Plus - Vapour Check Membrane (50m) | Insulation Merchant 3m Pro Clima Intello Plus - Vapour Check Membrane (50m) | Insulation Merchant
    Sale 10%
    INTELLO PLUS by Pro Clima

    3m Pro Clima Intello Plus - Vapour Check Membrane (50m)

    £535.90 inc. VAT
    £3.57 per m²
    £446.58 ex. VAT
    £2.98 per m²
    £535.90 inc. VAT
    £3.57 per m²
    £598.20 Save £62.30
    £446.58 ex. VAT
    £2.98 per m²
    £498.50 Save £51.92