What Order to Do a Home Energy Upgrade in Ireland
Insulation, roof, heat pump, then solar. Doing the steps in the right order saves money and stops you undoing work later.
Grant figures confirmed against SEAI
A Home Energy Upgrade Works Best When the Steps Happen in the Right Order
A home energy upgrade in Ireland is rarely one job. It is a sequence, insulation, roof, heat pump and solar, and the order you do them in decides how much you spend and how well the finished home performs. Get it right and each step makes the next one cheaper.
The thread running through all of it is the SEAI grant scheme, which supports insulation, heat pumps and solar as separate measures. You can claim each one as you reach it, so a staged upgrade spreads the cost without losing any grant. What you cannot easily undo is doing things out of order, like fitting solar to a roof that needs replacing, or sizing a heat pump for a house you later insulate.
The Right Order for a Home Energy Upgrade, and Who You Need at Each Step
Four steps, each setting up the next. Every step is a different trade and a different registration, so it helps to know who does what.
Insulate the fabric first
Insulation is step one of any home energy upgrade. A well-sealed home needs less heat, so every system fitted after it can be smaller, cheaper to buy and cheaper to run. Attic and wall insulation is also the core SEAI grant, so it pays back twice.
Start by getting quotes from SEAI-registered insulation contractors.
Sort the roof before roof-mounted solar
If the roof is near the end of its life and you are planning roof-mounted solar, deal with the roof first. Fitting panels onto a roof that needs replacing means lifting them off again a few years later, at your own cost.
The roofers explain the timing in their guide to re-roofing while the scaffold is up.
Fit the heat pump as the main heat source
With the fabric sorted, a heat pump becomes the main heat source, grant-eligible for up to €12,500 (as of July 2026). It runs at a low flow temperature, which is exactly why the insulation had to come first. Commissioning the system and fitting the hot water cylinder is a job for a registered plumber.
Line up an RGI-registered plumber, then compare heat pump installers in your county.
Add solar PV and the electrical connection
Solar panels offset the electricity a heat pump draws, which improves the running-cost case for both. The connection has to be certified and registered with the grid, which is work for a registered electrician who can also handle EV charging at the same time.
The grid connection needs a registered electrician, then compare solar panel installers near you.
Where the SEAI Grants Fit into the Upgrade
Each step carries its own SEAI support. Insulation and the heat pump grant of up to €12,500 (as of July 2026) are the biggest levers, and solar PV has its own grant on top. Because they are separate, the order is about cost and performance, not eligibility.
A registered installer confirms what your home qualifies for during a free survey, and most homes built and lived in before 2021 are eligible. The grant paperwork is handled for you as part of the work.
How the SEAI grants workHome Energy Upgrade Order, Answered
What order should I do a home energy upgrade?
Insulation first, then the roof if it needs replacing before solar, then the heat pump, then solar PV. Getting the fabric right first means the heat pump can be smaller and cheaper to run.
Should I insulate before a heat pump?
Yes, wherever the budget allows. A heat pump runs at a low flow temperature, so a well-insulated, airtight home is what lets it keep you warm cheaply. Many homes upgrade attic and wall insulation first or alongside the heat pump.
Do I need to re-roof before solar panels?
Only if the roof is near the end of its life. Solar panels last around 25 years, so fitting them onto a roof that needs replacing soon means paying to remove and refit them later. If the roof is sound, solar can go straight on.
Does the order affect the SEAI grants?
The grants for insulation, heat pumps and solar are separate, so you can claim each as you go. The order matters for cost and performance rather than eligibility, because good insulation makes the heat pump grant go further.
Can I do it all at once?
You can, and a one-stop-shop route under SEAI bundles measures together. Doing it in stages spreads the cost and still works, as long as you keep the order in mind so earlier work does not have to be undone.
Who do I need for each step?
An insulation contractor for the fabric, a roofer if the roof needs work, an SEAI-registered heat pump installer plus a plumber to commission it, and an electrician for the solar and grid connection. Each is a different registration.
More on Heat Pumps and SEAI Grants
SEAI heat pump grant explained How the grant of up to €12,500 (as of July 2026) works and how to apply. Read guide 
Is my home suitable for a heat pump? Insulation, BER and radiators that decide suitability. Read guide 
Heat pump cost in Ireland What each system costs, before and after grants. Read guide 
Heat pump installers in Ireland SEAI-registered, grant-eligible installers in all 26 counties. Read guide Ready to Start Your Home Energy Upgrade?
Whatever step you are on, a home energy upgrade starts with an SEAI-registered installer. Find one in your county and get the survey that turns the plan into a quote.