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SEAI grants · cavity · internal · external · checked November 2026

Wall insulation grants: up to €8,000

SEAI pays a fixed grant for one of three wall jobs. For a semi-D it's €1,300 to fill a cavity, €3,500 to insulate the walls on the inside (dry lining) and €6,000 to wrap them on the outside. A detached house gets up to €8,000 (SEAI).

For homes built and lived in before 2011. Check your grant in three taps, then send 4 answers and one SEAI-registered insulation contractor who covers your area rings you to look at the walls and price it in writing.

Get a free quoteCheck my grantFree. Your grant in 3 taps, then 4 questions for a price. One SEAI-registered contractor rings you.

Figures checked against SEAI and Citizens Information on 2 November 2026. wallinsulationgrants.ie is not SEAI or a government body and does not award grants.

The three wall insulation jobs SEAI grants, seen from above Three walls in section, outside on the left and the room on the right. Cavity wall: two leaves of block with the gap between them filled with insulation pumped in through drilled holes. Internal insulation, or dry lining: a solid wall with insulation board, a vapour control layer and plasterboard fixed to the inside face, so the room gets a little smaller. External insulation, or the wrap: a solid wall with insulation slabs fixed to the outside, covered with mesh and render, so nothing changes inside. Seen from above. Our drawing, not to scale. Cavity wallOUTSIDEROOMGap filled throughdrilled holes Internal (dry lining)OUTSIDEROOMBoard, vapour layer,plasterboard inside External (the wrap)OUTSIDEROOMSlabs, mesh andrender outside
The three jobs SEAI grants for walls, as its Homeowner's Guide to Wall Insulation describes them (SEAI). Which one a house can have depends on how its walls were built.
  • €8,000SEAI's fixed external wall grant for a detached house, the biggest of the three
  • €4,500for internal wall insulation (dry lining) on a detached house (SEAI)
  • €2,300the higher cavity grant for a detached house, for certain welfare recipients and HAP or RAS landlords (Citizens Information)
  • 24%of homes on the BER register with a known wall type have solid or hollow block walls: no cavity to fill (SEAI BER register)

FreeNo obligationOne contractor rings you, not fiveSEAI approves the grant before any work

Grant check

Your wall grant and what's left to pay

Three taps: the wall job, your home, and which rate fits you. The answer is SEAI's fixed grant and its own median cost for the job.

Wall job
Your home
Which fits you?

Your SEAI wall insulation grant

€3,500

SEAI median cost, Jan to Jun 2026
€9,843
Left to pay at the median
€6,343

SEAI's fixed internal (dry lining) grant for a semi-d or end of terrace at the standard rate is €3,500 (Citizens Information and SEAI, 2 November 2026). SEAI's median cost for that job on a semi-d or end of terrace, January to June 2026, was €9,843. €9,843 less €3,500 leaves about €6,343. Our sum; your quote can be higher or lower.

Send this for a real price
How this is worked out

The grant is SEAI's fixed amount for that wall job and home type, as SEAI's wall insulation page and Citizens Information (Citizens Information, updated 22 October 2026) list it. The higher rate applies to cavity walls only. The median cost is SEAI's own figure from grant-funded jobs completed between January and June 2026 (SEAI median costs); the PDF doesn't say whether VAT is in. Left to pay is the median less the grant, our sum. The home must have been built and lived in before 2011, every external wall must be done, the contractor must be on SEAI's register, and SEAI must approve the grant before work starts. It's an estimate, never a quote.

The grants

SEAI wall insulation grants by home type

Home typeCavity wallCavity, higher rate*Internal (dry lining)External (wrap)
Detached house€1,800€2,300€4,500€8,000
Semi-D or end of terrace€1,300€1,700€3,500€6,000
Mid-terrace€850€1,100€2,000€3,500
Apartment€700€900€1,500€3,000

* Homeowners on certain welfare payments, and landlords with a tenant on HAP or RAS. There is no higher rate for internal or external insulation, and no first-time buyer rate for walls. Sources: SEAI, Citizens Information (page updated 22 October 2026) and SEAI median costs.

Each grant is a fixed amount, not a share of your price. SEAI approves it before the work and pays it after, once the contractor's paperwork and a new BER are in. On 2 November 2026 one older SEAI page still showed the cavity grant before its February increase (€1,700 for a detached house, seai.ie); the current amounts are above. The 2026 amounts page has the dates.

The cost

What each wall job costs after the grant

JobHome typeMedian costGrantLeft to payGrant covers
Cavity wallDetached house€2,350€1,800€55077%
Semi-D or end of terrace€1,585€1,300€28582%
Mid-terrace€1,250€850€40068%
Apartment€1,036€700€33668%
Internal (dry lining)Detached house€8,600€4,500€4,10052%
Semi-D or end of terrace€9,843€3,500€6,34336%
Mid-terrace€9,804€2,000€7,80420%
Apartment€5,736€1,500€4,23626%
External (the wrap)Detached house€26,500€8,000€18,50030%
Semi-D or end of terrace€23,219€6,000€17,21926%
Mid-terrace€14,000€3,500€10,50025%
Apartment€11,300€3,000€8,30027%

SEAI's median costs and fixed grants, January to June 2026 (SEAI median costs). Left to pay and the share the grant covers are our sums.

The cavity grant covers most of a typical cavity job. Internal and external insulation are bigger jobs, and the grant covers about a third to a half. The cost guide has what moves the price.

Your walls

Which grant fits your walls

67%of homes on the BER register with a known wall type have cavity walls; 6% still show an empty cavity (SEAI BER register)
24%have solid or hollow block walls: no cavity, so internal or external insulation
40%of those solid and hollow block walls already show some insulation
9%are timber frame, usually insulated when built
  • Cavity (filled or not)
  • Solid or hollow block
  • Timber frame

From 549,459 BER certificates for homes built before 2011 where the main wall type is recorded, leaving out BERs done for grant claims (SEAI BER register, our sums).

  • Cavity wall, empty: the cavity grant. It's the lowest-cost job of the three by far. cavitywallinsulation.ie covers it in detail.
  • Solid or hollow block: internal or external. External costs more and gets the bigger grant; internal keeps the outside as it is but takes some room space. Internal vs external compares them.
  • Not sure: your BER certificate's advisory report names the wall type, or the contractor checks when they call. Which wall insulation?

The rules

What every wall grant needs

  • The home was built and lived in before 2011: SEAI goes by the date the electricity meter was installed (seai.ie). It needs an 11-digit MPRN.
  • Every external wall is insulated. SEAI does not grant part of a house.
  • One wall grant per home. A property that already had wall insulation through any government scheme can't get more for walls (seai.ie).
  • The contractor is on SEAI's register for that type of work, and SEAI approves the grant before materials are bought or work starts (Citizens Information).
  • A BER assessor rates the home after the work; SEAI adds €50 towards that BER.
  • If the work changes more than 25% of the home's outer surface, Building Regulations want the home to reach a B2 BER, or to have compliant heating and attic insulation (SEAI).

How to apply has the steps and the deadlines.

How it works

From the form to insulated walls

  1. Check your grant and send 4 answersYour home, the wall job, when it was built, and which rate fits you. Only your number is needed.
  2. One contractor rings youOne SEAI-registered insulation contractor who covers your area. They check how the walls are built and price it in writing.
  3. You apply to SEAIOnline, with your MPRN and the contractor's name. Wait for approval before anything is bought or started.
  4. The work, the BER, the grantAfter the job a BER assessor rates the home, you submit the paperwork and SEAI pays the fixed grant.

Attic, walls, windows

The other SEAI grants on our sister sites

SEAI's individual grants can be combined. atticinsulationgrant.ie covers the attic, cavitywallinsulation.ie the cavity job in depth, housewrap.ie external insulation, and windowgrants.ie windows and doors. All home insulation grants puts them in one table.

Your grant

Your wall grant and a price, in 4 taps

Tap your home, which wall job you think it needs, when it was built and which rate fits you. Then leave your number and one SEAI-registered insulation contractor who covers your area rings you to look at the walls and price it in writing.

What type of home is it?

SEAI pays a fixed amount for each type of home.

By sending, you agree to Wall Insulation Grants passing your details to one SEAI-registered insulation contractor who covers your area, so they can contact you about the job. wallinsulationgrants.ie is not SEAI or a government body and does not award grants. Privacy notice

FAQ

Questions people ask

How much is the SEAI wall insulation grant?

It depends on the job and the home. For a semi-D: €1,300 for cavity wall insulation, €3,500 for internal (dry lining) and €6,000 for external. For a detached house: €1,800, €4,500 and €8,000 (SEAI).

Is there a higher wall insulation grant?

Only for cavity walls: up to €2,300 for a detached house, for homeowners on certain welfare payments and landlords with a HAP or RAS tenant (Citizens Information). Internal and external insulation have one rate.

How much does wall insulation cost after the grant?

At SEAI's median costs for January to June 2026, a semi-D is left with about €285 for cavity, €6,343 for internal and €17,219 for external insulation (SEAI median costs). See the cost guide.

Which wall insulation grant can I get?

The one that fits how your walls are built. A cavity wall that's empty gets the cavity grant. A solid or hollow block wall needs internal or external insulation, and you choose which. See which wall insulation.

Can I get the grant for one room or one wall?

No. SEAI says all external walls must be fully insulated; partial insulation isn't eligible. See one room or one wall.

Are you SEAI?

No. Wall Insulation Grants is an introduction service run by Bartlomiej Standa, trading as Elevate Ireland. We pass your request to one SEAI-registered insulation contractor who covers your area. SEAI decides every grant. wallinsulationgrants.ie is not SEAI or a government body and does not award grants.

Where these numbers come from (5 public sources, checked 2 November 2026)
  1. SEAI, wall insulation grant page
  2. Citizens Information, Better Energy Homes Scheme (page updated 22 October 2026)
  3. SEAI, individual energy upgrades: median costs and fixed grants, January to June 2026, 23,412 upgrades (PDF)
  4. SEAI BER Research Tool, full public file (downloaded 29 October 2026, our sums)
  5. SEAI, insulation grants page