Offering one stop shop services

Turn your home into an EnergyHaus.

Your all-in-one design-build retrofit specialists, delivering full-scope home retrofit upgrades from concept to completion.

Our promise

One stop shop home retrofit, end to end.

From first survey to final sign-off, we handle design, grants, installation and certification, all under one roof across the North East and Dublin.

  • One stop shop service

    SEAI grant scheme

  • In partnership with REIL

    SEAI-registered provider

  • Part of the Lennon Group

    Local family business since 1981

  • RECI registered

    Registered electrical contractor

  • NSAI standards

    National Standards Authority of Ireland

What we do

Our services

  • Installer injecting cavity wall insulation through a brick wall

    Cavity Wall Insulation

    *Assessed & included when relevant

    Grants up to €1,800 for detached houses

  • Roof-mounted solar PV panels against a blue sky

    Solar PV

    *Assessed & included when relevant

    Grants up to €1,800 depending on system size

  • Roof & Attic Insulation

    *Assessed & included when relevant

    Attic up to €2,000 / Rafter up to €3,000 for detached houses

  • Windows & Doors

    *Assessed & included when relevant

    Grants up to €4,000 for detached houses

  • Air source heat pump unit installed beside a home

    Heat Pumps

    *Assessed & included when relevant

    Grants up to €10,500 for houses

  • External wall insulation being installed mid-retrofit

    External Wall Insulation

    *Assessed & included when relevant

    Grants up to €8,000 for detached houses

Retrofit Options

Where every measure goes on your house

Tap any glow on the house to see what we install there.

Solar PV

Roof-mounted panels that turn daylight into your electricity. A 4 kW system is the common spec, enough to cover most of a heat-pump household's daytime use, with the surplus exporting back to the grid.

Get a quote →

Reviews

What our customers say

★★★★★

"As a retired tradesman myself, I was very impressed by the standard of work and the attention to detail. Any snags were very minor and swiftly dealt with, and the whole project completed well ahead of the estimated finishing date. We have no hesitation in recommending Chris and all the crew to anybody considering getting this work done."

Adrian & Olivia McCarthy, Drogheda, Co. Louth
C1BER before A1BER after

★★★★★

"I highly recommend the Lennon company. The work was finished very well, with a high standard maintained throughout. I used them for the vacant property grant, and I am delighted with the finished work."

Sandra Judge, Drogheda, Co. Louth
FBER before BBER after

★★★★★

"The external wall insulation and new heat pump have already made a noticeable difference to the comfort and energy efficiency of our home. Ours is an older terrace dating back to 1925, and a number of challenges arose along the way, but the team's professionalism and attention to detail saw every issue solved and the work finished to a high standard. We are delighted with the result and would have no hesitation in recommending EnergyHaus."

MF, Sandymount, Dublin 4
FBER before B1BER after

Our work

Our latest projects

  • Adrian and Olivia's two-storey semi-detached home in Drogheda after its retrofit

    Drogheda, Co. Louth

    BER C1 → A1

    Adrian & Olivia's deep retrofit

    Solar PV with battery storage, triple-glazed windows and doors, and a Mitsubishi air-to-water heat pump.

    Completed May 2026

    Read more →
  • Sandra's brick bungalow in Drogheda after its retrofit

    Drogheda, Co. Louth

    BER F → B

    Sandra's vacant-home retrofit

    All-black solar PV, triple-glazed windows and doors, and external and internal wall insulation.

    Completed April 2026

    Read more →
  • A 1920s mid-terrace home in Sandymount, Dublin 4 after its retrofit

    Sandymount, Dublin 4

    BER F → B1

    A 1925 terrace, warm at last

    Wall insulation inside and out, an air source heat pump, attic and ceiling insulation, and passive ventilation.

    Completed May 2026

    Read more →
  • Gerry's detached home in Ardee, Co. Louth, where an oil system was replaced with a heat pump

    Ardee, Co. Louth

    BER B → A

    Gerry's heat pump upgrade

    A 16kW Daikin air-to-water heat pump in place of the oil system, with a new cylinder, manifold upgrade and digital controls.

    Completed August 2026

    Read more →

Inquire now →

Get a quote

Interested in starting your own retrofit?

Tell us a bit about your home and we'll come back to you within a working day.

How it works

From inquiry to sign-off, in seven clear steps.

No surprises. Here's what happens between us shaking hands and you turning the new heating on.

  1. Step 01 / 07

    Get in touch

    Fill in the short form. We'll be back to you within a working day.

  2. Step 02 / 07

    Quick online chat

    A 15-minute call to talk through your home, your priorities, and the rough budget.

  3. Step 03 / 07

    Home visit & proposal

    We visit, take measurements, then come back with a clear plan and a fixed price.

  4. Step 04 / 07

    Grants & design

    We handle the SEAI grant paperwork and design the system around your house.

  5. Step 05 / 07

    Contract & schedule

    A written contract, a start date, and a step-by-step work plan you can hold us to.

  6. Step 06 / 07

    The works

    Our team carries out the retrofit upgrades. Everything is signed off against SEAI standards, and we arrange a post-works survey to confirm the install has been completed as planned.

  7. Step 07 / 07

    Sign-off

    You get a Homeowner Manual covering what we installed, how to run it, and what to do if anything plays up.

Get in touch

Interested in starting your own retrofit?

Contact us today to get started.

Contact us