Energy and insulation

External wall insulation

Insulating and rendering the outside of a solid-wall house.

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Whether this needs a licence in Ireland

Ireland

No licence required

SEAI Registered Contractor (needed only for grant-funded work)

Taken from the statute below; not yet reviewed by a lawyer

Sustainable Energy Authority of Irelandwww.seai.ieChecked 11/10/2026

External wall insulation: what the job involves

Wrapping the outside of a house in insulation boards and a new render finish, so solid or hollow-block walls stop losing heat without touching the rooms inside. Often called the external wrap, it is the biggest single fabric upgrade for an older home.

Also asked for as: external insulation grant · house wrap · external wrap · EWI · insulate outside walls

How the job is usually done

Survey the walls, sills, eaves, downpipes, meter boxes and anything fixed to the walls, and check for damp, cracks and asbestos.
Agree the board thickness, the finish and colour, and how window sills, eaves and the ground level will be detailed.
Erect scaffolding and take down downpipes, lights, satellite dishes, alarm boxes and gates.
Fit starter tracks and fix the insulation boards with adhesive and mechanical fixings, including the window reveals.
Apply a base coat with reinforcing mesh, then fit extended sills and corner beads.
Apply the primer and the finished render in the agreed colour.
Refix downpipes, lights and fixtures on extended brackets, and strike the scaffolding.
Record the work for the system certificate, the grant and the BER.

External wall insulation: what is included

Usually included

Scaffolding for the duration of the works
Insulation boards, mesh, base coat and finish render
Extended sills and corner beads
Taking down and refixing downpipes and fixtures on the walls

Usually not included — agree it separately

Extending the roof eaves or fascia if the overhang is too short
New windows, which should ideally go in first
Moving gas meters or ESB meter boxes, which need the utility
Electrical work on outside lights, which needs a registered electrician
Ventilation upgrades inside the house

Materials and who supplies them

EPS, mineral wool or phenolic boards from a certified system
Adhesive, fixings, mesh, base coat and render from the same system
Extended aluminium sills and trims
Scaffolding, hired by the contractor

How long it takes

Usually two to four weeks with scaffolding up; longer in wet weather, because render cannot go on in rain or frost.

When to book

Book for late spring to early autumn, because render needs dry weather above about five degrees to cure.

External wall insulation: the rules in Ireland

What the official sources say, checked against them on the date shown. A summary, not legal advice — follow the link to read the rule itself.

For the grant, the work must be done by a contractor on SEAI’s register for that measure, and only after the grant offer is accepted — work started before approval is not grant-aided.
Applies to: the homeowner and the contractor
Sustainable Energy Authority of Ireland · hes.seai.ie · Checked 9 October 2026
The grant must be claimed within eight months of the offer, and a BER by a registered assessor is needed after the works before SEAI pays.
Applies to: the homeowner
Sustainable Energy Authority of Ireland · seai.ie · Checked 9 October 2026
Building work on a home is charged at the reduced VAT rate of 13.5% by a VAT-registered business, unless materials make up more than two-thirds of the price.
Applies to: the contractor
Revenue · revenue.ie · Checked 9 October 2026
Since 27 July 2026, external wall insulation up to 15 cm thick is exempt from planning permission on a house; protected structures and Architectural Conservation Areas still need the council’s advice.
Applies to: the homeowner
Planning and Development (Exempted Development) Regulations 2026 (S.I. 338 of 2026) · gov.ie · Checked 9 October 2026
Where more than 25% of the surface of the building envelope is renovated, it is a major renovation and the whole home should be brought up to the cost-optimal energy standard where technically, functionally and economically feasible.
Applies to: the homeowner and the designer
Building Regulations Part L (Department of Housing) · gov.ie · Checked 9 October 2026
Scaffolding and work at height must be planned, inspected and done by competent people; a homeowner must appoint competent contractors.
Applies to: the contractor and the homeowner
Health and Safety Authority — Construction Regulations 2013 · hsa.ie · Checked 9 October 2026

Grants

SEAI external wall insulation grant
€8,000 for a detached house, €6,000 for a semi-detached or end-of-terrace house, €3,500 for a mid-terrace house and €3,000 for an apartment.
Who qualifies: Owners of homes built and occupied before 31 December 2010, using an SEAI-registered contractor, with approval before work starts.
seai.ie · Checked 9 October 2026
Enhanced rates and the Warmer Homes Scheme
Higher “enhanced” grant rates apply to first-time buyers who bought on or after 1 January 2025, people on qualifying welfare payments, and homes with a HAP or RAS tenancy. Homeowners on certain welfare payments in homes built and occupied before 2006 may get a fully funded upgrade instead.
Who qualifies: Owners who meet the scheme’s conditions; the fully funded route has a waiting list SEAI quotes at about 15 months.
seai.ie · Checked 9 October 2026
SEAI One Stop Shop
A registered One Stop Shop manages a whole-house upgrade to at least a B BER, handles the grants and deducts them from the price up front.
Who qualifies: Homeowners planning several upgrades together that bring the home to at least a B BER.
seai.ie · Checked 9 October 2026

What external wall insulation costs, and why

What jobs on Talqero came to

Not enough comparable jobs yet to publish a range here. Talqero shows a price range only once at least five comparable jobs, agreed prices or offers exist — a range from fewer would describe a handful of jobs, not the market. Post your job and compare the offers you get.

What affects the price

Wall area and the number of corners, windows and doors
Board thickness and material
Scaffolding and access, especially on terraces and tight sites
Eaves, sills, meters and fixtures that need detailing or moving
Finish: standard render, brick-slip or a decorative finish
Repairs to the existing walls before boards go on
VAT: building work on a home is charged at the reduced rate of 13.5% by a VAT-registered business — unless the materials come to more than two-thirds of the price, when Revenue’s two-thirds rule applies the goods rate to the whole job. Ask whether a quote includes VAT.

Paperwork to ask for at the end

The system manufacturer’s certificate or guarantee and its NSAI Agrément or European Technical Assessment
Scaffolding handover and inspection records, on request
An itemised invoice and the SEAI declaration of works
A post-works BER for the grant

Safety

Scaffolding goes up around the whole house; keep children away and agree how doors and the driveway stay usable.
The house becomes more airtight, so rooms need working ventilation afterwards to avoid condensation and mould.
Old fibre-cement sills, soffits or panels may contain asbestos and must be checked before they are cut or removed.

External wall insulation: before you hire

Questions to ask a tradesperson

Are you on SEAI’s register for external wall insulation?
Which certified system will you use, and what thickness?
How will you detail the eaves, sills and ground level?
What guarantee comes with the render?
Does the price include scaffolding and refixing everything on the walls?

What you can do yourself

Not a DIY job: it needs scaffolding, a certified system and trained applicators, and grant work must be done by a registered contractor.

What to put in your task

What type of home is it?
What are the walls built from?
Do the roof eaves overhang the walls by more than a hand’s width?
Are you replacing windows in the next few years?
What finish would you like?
Are you applying for the SEAI grant or a One Stop Shop upgrade?

Photos that help

Every side of the house, whole walls in frame
The eaves and the gable ends
Windows and sills, close up
Meter boxes, flues, outside lights and anything fixed to the walls
Access along each side, including the neighbours’ boundary

External wall insulation by county

Choose your county for external wall insulation close to home.

Energy and insulation

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Questions about external wall insulation

Does external wall insulation need a licence in Ireland?

No licence is required for this work in Ireland (source: www.seai.ie). Ask instead for references and photographs of similar jobs.

Do I need planning permission for external insulation?

Since 27 July 2026, external wall insulation up to 15 cm thick on a house is exempt from planning permission. A protected structure, a house in an Architectural Conservation Area or a thicker system should be checked with the county council first.

Can I live in the house during the work?

Yes. The work is all outside, though windows may be covered for a few days and scaffolding will be up for some weeks.

Will the house need extra ventilation?

Usually yes. Wrapping the walls makes the house more airtight, so rooms need trickle vents, wall vents or mechanical extraction to keep condensation down. A good contractor checks this before starting.

Is a mid-terrace house worth wrapping?

Often, because only the front and back walls lose heat and the work is smaller. The edges against the neighbours need careful detailing to avoid cold bridges and disputes.

Often booked with external wall insulation

Insulation installers