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Home energy guide

Home energy upgrade costs in Ireland

A gross-cost planning reference for energy upgrades and the wider renovation work that may sit beside them.

Last reviewed: October 2026

What these figures mean

Start with the gross cost of the complete project, then consider potential grants separately. These figures reproduce the existing DanannIQ dataset; they are not new market research or contractor quotations. Location, specification, access, dwelling condition and the exact scope can change the final price.

  • Published benchmark: where the existing record identifies SEAI completed-project medians for January–December 2025, those medians are shown separately. They describe completed projects, not the price of your home.
  • DanannIQ planning assumption: low/high spreads around those medians, retained market ranges, area rates and renovation tiers. The spreads are not SEAI published percentiles. Generic market-source labels in the existing record do not provide a publication-level audit trail.
  • User-entered quote: an actual itemised contractor price for the scope you agree. The calculator accepts a separate installed battery quote to override its battery assumption. Other reference figures shown here remain planning ranges.

House-type ranges are reference cases, not minimum or maximum budgets. Solar PV sizing, window count, work area and battery capacity can adjust the calculator result. Do not sum every range on this page: include only your selected scope and check shared or overlapping work.

Source-period note: the retained DanannIQ record attributes its benchmark figures to January–December 2025. The SEAI current individual-upgrade median costs PDF (January–June 2026) now reports January–June 2026 and contains different medians. This page preserves the stored figures used by the calculator; it does not present them as the latest SEAI publication or silently replace them with the newer sample.

Energy upgrade planning ranges

Ceiling-level attic insulation

DanannIQ planning assumption · January to December 2025. Range modelled around the published benchmark below.

  • Detached: €2,300–€2,800. Published benchmark median: €2,519.
  • Semi-detached / end-of-terrace: €1,800–€2,200. Published benchmark median: €2,000.
  • Mid-terrace: €1,800–€2,200. Published benchmark median: €2,000.
  • Apartment: €1,700–€2,100. Published benchmark median: €1,894.

Main cost drivers: Roof-space area, existing insulation, access, ventilation detailing and raised storage or walkway requirements.

Published 2025 completed-project medians for conventional attic insulation at ceiling level.

Read the ceiling-level attic insulation guide.

Rafter insulation

DanannIQ planning assumption · 2026 planning range. Retained planning range; not an official or published median.

€100–€180/m² of the relevant work area.

Main cost drivers: Insulated roof area, roof geometry, lining and finishing, ventilation and access.

Planning range for rigid rafter-level insulation including typical lining/finishing. Roof geometry, ventilation detailing, access and existing finishes can materially change the price.

Read the rafter insulation guide.

Cavity wall insulation

DanannIQ planning assumption · January to December 2025. Range modelled around the published benchmark below.

  • Detached: €2,000–€2,500. Published benchmark median: €2,250.
  • Semi-detached / end-of-terrace: €1,400–€1,700. Published benchmark median: €1,550.
  • Mid-terrace: €1,000–€1,200. Published benchmark median: €1,100.
  • Apartment: €900–€1,100. Published benchmark median: €950.

Main cost drivers: Wall area, cavity condition, survey findings and access around the building.

Published 2025 completed-project medians. A survey is required to confirm that the cavity is present, clear and suitable for filling.

Read the cavity wall insulation guide.

External wall insulation

DanannIQ planning assumption · January to December 2025. Range modelled around the published benchmark below.

  • Detached: €22,500–€28,000. Published benchmark median: €24,980.
  • Semi-detached / end-of-terrace: €20,900–€26,000. Published benchmark median: €23,247.
  • Mid-terrace: €12,800–€16,000. Published benchmark median: €14,244.
  • Apartment: €15,700–€19,500. Published benchmark median: €17,450.

Main cost drivers: Wall area, scaffolding, render specification and detailing at eaves, openings and services.

SEAI published completed-project median cost. The low/high planning range is modelled around that median and is not an SEAI published percentile range.

Read the external wall insulation guide.

Internal wall insulation

DanannIQ planning assumption · January to December 2025. Range modelled around the published benchmark below.

  • Detached: €7,900–€10,400. Published benchmark median: €9,000.
  • Semi-detached / end-of-terrace: €9,200–€12,000. Published benchmark median: €10,420.
  • Mid-terrace: €5,500–€7,200. Published benchmark median: €6,303.
  • Apartment: €3,200–€4,200. Published benchmark median: €3,640.

Main cost drivers: Wall area, moisture-compatible design and reinstatement of sockets, radiators, skirtings and finishes.

Published 2025 completed-project medians. Internal dry lining can also require significant reinstatement of skirtings, sockets, radiators and finishes.

Read the internal wall insulation guide.

Floor insulation

DanannIQ planning assumption · 2026 planning range. Retained planning range; not an official or published median.

  • Suspended timber: €30–€60/m².
  • Solid floor: €40–€80/m².
  • Unknown floor type: €30–€80/m².

Main cost drivers: Floor type, accessible area and whether the floor can be insulated without excavation and reconstruction.

Installed per-square-metre planning range. Solid-floor work can become much more expensive if floors must be excavated and rebuilt; that scenario is not assumed here.

Read the floor insulation guide.

Windows

DanannIQ planning assumption · 2026 planning range. Retained planning range; not an official or published median.

€10,000–€16,000 for the reference 10-window project.

Main cost drivers: Window count and dimensions, frame and glazing specification, large openings and making good.

Reference range is normalised around a typical 10-window replacement project. Number of windows, dimensions, glazing, frame material and large openings can materially affect the quotation.

Read the windows guide.

External doors

DanannIQ planning assumption · 2026 planning range. Retained planning range; not an official or published median.

€1,400–€3,000 per door.

Main cost drivers: Door count, material, glazing, side panels and opening repairs.

Per-door planning range. Door material, glazing, side panels, oversized openings and remedial work can materially affect the final price.

Read the external doors guide.

Heating controls

DanannIQ planning assumption · January to December 2025. Range modelled around the published benchmark below.

  • Detached: €3,200–€3,900. Published benchmark median: €3,500.
  • Semi-detached / end-of-terrace: €3,200–€3,900. Published benchmark median: €3,500.
  • Mid-terrace: €2,700–€3,400. Published benchmark median: €3,054.
  • Apartment: €4,200–€5,200. Published benchmark median: €4,646.

Main cost drivers: Number of zones, existing wiring, valves, plumbing changes and compatibility with the current system.

SEAI published completed-project median cost. The low/high planning range is modelled around that median.

Read the heating controls guide.

Heat pump

DanannIQ planning assumption · January to December 2025. Range modelled around the published benchmark below.

  • Detached: €14,500–€19,000. Published benchmark median: €16,500.
  • Semi-detached / end-of-terrace: €14,800–€19,400. Published benchmark median: €16,832.
  • Mid-terrace: €13,200–€17,300. Published benchmark median: €15,000.
  • Apartment: €8,900–€11,600. Published benchmark median: €10,067.

Main cost drivers: Heat-loss design, system specification, distribution changes, cylinder and electrical work.

SEAI published completed-project median cost. Radiator, underfloor-heating, hot-water cylinder and other system upgrades may add to the final cost.

Read the heat pump guide.

Solar PV

DanannIQ planning assumption · January to December 2025. Range modelled around the published benchmark below.

  • Detached: €9,900–€11,800. Published benchmark median: €10,730.
  • Semi-detached / end-of-terrace: €8,600–€10,300. Published benchmark median: €9,400.
  • Mid-terrace: €8,100–€9,600. Published benchmark median: €8,750.
  • Apartment: €6,500–€7,800. Published benchmark median: €7,100.

Main cost drivers: System size, roof access, shading and layout, inverter specification and separately priced storage.

SEAI published completed-project median cost. System size, battery storage, roof layout and equipment specification can materially change the final price.

Read the Solar PV guide.

Solar thermal

DanannIQ planning assumption · 2026 planning range. Retained planning range; not an official or published median.

€3,200–€4,800 for the reference project.

Main cost drivers: Collector specification, roof access, cylinder changes and plumbing routes.

Planning range for a typical domestic solar-hot-water system. Collector type, cylinder changes, roof access and plumbing layout can move the final price.

Read the solar thermal guide.

Battery storage

DanannIQ planning assumption · October 2026. Retained planning range; not an official or published median.

€3,000–€6,000 installed for 5 kWh.

Main cost drivers: Capacity, inverter compatibility, usable storage specification and electrical installation scope.

€3,000–€6,000 installed for 5 kWh, scaled linearly by capacity for planning only. Optional separate battery quote overrides the range. Unknown capacity visibly assumes 5 kWh; no published median is claimed. Confirm equipment, inverter compatibility and installation scope with quotes.

Read the battery storage guide.

Budgeting wider renovation work

Extensions, conversions, kitchens and bathrooms can share access, services and finishing work with energy upgrades. They do not themselves receive SEAI energy grants. Keep the general renovation budget separate and ask quotes to show any supported energy measures explicitly.

Extension

DanannIQ planning assumption · 2026 planning range; retained market guidance, not an official median.

€2,200–€3,200/m² of the relevant work area.

Planning range, not a quote. Specification, glazing, structure, access, groundworks and services materially affect cost. Dublin/high-spec work may exceed the upper range; professional/design/statutory fees are additional unless explicitly included.

Attic conversion

DanannIQ planning assumption · 2026 planning range; retained market guidance, not an official median.

€1,200–€1,800/m² of the relevant work area.

Planning range based on usable conversion area. Dormers, structural steel, trussed roofs, staircase complexity, fire-safety work, ensuite/bathroom, fitted storage and finishes may exceed the base range.

Kitchen renovation

DanannIQ planning assumption · 2026 planning range; retained market guidance, not an official median.

  • budget: €10,000–€15,000.
  • mid-range: €15,000–€40,000.
  • high-end: €40,000–€60,000.

Planning range, not a ceiling: high-end kitchens may exceed EUR 60,000 with bespoke cabinetry, premium appliances, stone/quartz worktops, large islands, structural alterations and plumbing/electrical relocation.

Bathroom renovation

DanannIQ planning assumption · 2026 planning range; retained market guidance, not an official median.

  • budget: €5,000–€8,000.
  • mid-range: €8,000–€15,000.
  • high-end: €15,000–€25,000.

Planning range per bathroom. Layout changes increase plumbing costs; premium fittings/tiling and hidden water damage/substrate work increase costs. Dublin and large/high-spec bathrooms may exceed these ranges.

Grants are separate from gross project costs

Use the SEAI grants guide to identify potential support, then compare grant routes. Do not assume every measure qualifies or that a maximum award can exceed the eligible cost of that work. Rafter and floor supports are OSS measures in DanannIQ, not standalone Individual Grants.

Turn a reference range into a budget

  1. Confirm quantities: insulated area, window and door count, usable renovation area, PV size and battery capacity.
  2. Ask what the quote includes: ventilation, scaffolding, electrical work, heating distribution, cylinders, finishes, VAT and waste removal.
  3. Check roof, wall, moisture and floor condition before relying on the base scope. Keep an explicit allowance for unresolved work rather than assuming the high range covers every defect.
  4. List design, assessment, statutory and professional fees separately where excluded. Check payment timing against grant drawdown.

The methodology describes the maintained dataset and modelling limits. For a newly purchased home, the buyer planning guide helps sequence surveys, applications and renovation decisions.

Build your home energy upgrade plan

Compare indicative project costs and potential SEAI support for your home. Planning eligibility is not final SEAI approval; confirm the scheme rules and obtain written quotes before committing.

Open the DanannIQ calculator

Have an Advisory Report? Start a BER-guided plan.

Official sources

Official grant information checked on 7 October 2026. Follow the measure-specific rules and your grant offer; announcements may precede detailed implementation guidance.

Read our Methodology & data sources or view all guides for the assumptions behind DanannIQ estimates.