External wall insulation being applied to an Irish home

External Wall Insulation
in Ireland

One of the most effective ways to insulate a solid-wall home. Get matched with an experienced local installer and receive a free, no-obligation quote.

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Why External Wall Insulation?

Solid-wall homes, common in Ireland before the 1970s, lose heat at nearly twice the rate of cavity-wall homes. External wall insulation wraps your home in a continuous thermal blanket, stopping heat loss at the source while giving your property a fresh new finish.

Wrap Your Home

External wall insulation creates a continuous thermal envelope around your entire home, eliminating cold spots and draughts that interior methods can miss.

Transform Appearance

Your home gets a completely new rendered finish in the colour of your choice. Many homeowners use external insulation as an opportunity to refresh their home's look.

Eliminate Cold Bridging

Solid walls conduct heat directly from inside to outside. External insulation breaks this thermal bridge completely, keeping your walls warm and dry.

Highest Grant Available

SEAI grants for external wall insulation go up to €8,000 for a detached home and €6,000 for a semi-detached. The higher grant reflects the larger energy savings.

Is External Insulation Right for Your Home?

External wall insulation is particularly effective for older solid-wall homes where cavity fill isn't an option. It's a larger investment, but it delivers the biggest thermal improvement and attracts the highest SEAI grants.

  • Ideal for solid-wall homes (typically pre-1970s construction)
  • No internal space lost. All work is done on the outside
  • Addresses thermal bridging that internal methods cannot
  • New weatherproof render finish protects against Irish rain
  • Can increase property value and kerb appeal

External Wall Insulation Costs in Ireland

External wall insulation is a larger investment, but SEAI grants cover a good portion of the cost. Prices vary based on property size and complexity.

Property Type Typical Cost
Mid-terrace €6,000 – €9,000
Semi-detached €8,000 – €14,000
Detached bungalow €10,000 – €16,000
Large detached €14,000 – €22,000

Internal Dry Lining as an Alternative

If external insulation isn't suitable for your property (for example, due to planning restrictions or shared walls) internal dry lining is an alternative. This involves fixing insulated plasterboard to the inside of your external walls. It typically costs €4,000–€8,000 but does reduce room sizes slightly (30-50mm per wall). It's less disruptive than external insulation but doesn't eliminate thermal bridging as effectively.

Prices are estimates based on typical Irish installations in 2026. Actual costs depend on wall area, insulation thickness, render type, and access. SEAI grants of up to €8,000 may apply for detached homes. Request a quote for an accurate price.

Frequently Asked Questions

Do I need planning permission for external wall insulation?
In most cases, external wall insulation is considered exempt development and does not require planning permission. However, if your home is in an architectural conservation area, is a protected structure, or if the insulation extends significantly beyond the existing building line, you may need permission. Your installer can advise based on your specific property.
How long does external wall insulation take to install?
A typical semi-detached home takes 2-3 weeks from scaffolding to final render. Detached homes may take 3-4 weeks. The timeline depends on property size, weather conditions, and the complexity of details around windows, doors, and soffits. Your home remains fully liveable throughout the process.
Will external insulation change how my house looks?
Yes. Your home will have a new rendered finish. You choose the colour and texture. Many homeowners see this as a benefit, as it gives the house a fresh, modern appearance. The wall thickness increases by 80-100mm, which is noticeable around windows and doors but is neatly detailed with aluminium or PVC trims.
What happens around windows and doors?
Window and door reveals are insulated with thinner boards, and new aluminium or PVC sills and trims are fitted to accommodate the increased wall thickness. This is standard practice and creates a clean, finished look. Existing window sills are typically extended or replaced.
Will external insulation fix my damp problems?
External insulation can help reduce condensation by keeping your internal wall surfaces warmer. It also provides an additional weatherproof layer against driving rain. However, if you have rising damp or structural damp issues, these should be resolved before insulation is applied. A pre-installation survey will identify any damp concerns.

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