Why a Designed Efficient home means lower energy bills

Energy bills have become one of the biggest pressures on Northern Ireland households, and unlike many other costs, they're not tied to one bad winter or a single market shock. Even with prices easing back from the peaks of recent years, the average NI household is still paying significantly more for electricity than they were before 2021, with rates here typically sitting 10-20% above those in Great Britain.

The reality is that energy efficiency isn't a 'nice-to-have' any more. For most families, it's one of the few levers they can actually pull to bring annual costs down - and it's the single biggest reason we built our Designed Efficient standard into every new Hagan home.

Here's how it works, and what it means for your bills.

What Designed Efficient really means

Designed Efficient is the standard that runs through every new home we build. It isn't a bolt-on, an upgrade, or a premium spec - it's the way we construct as standard. Every home is built to achieve an A or B Energy Performance Certificate (EPC) rating, which puts them in the top tier of energy-efficient housing in Northern Ireland.

The savings come from how the home is designed and built, not from how the homeowner remembers to use it. That's the bit that matters most when energy prices are unpredictable: the efficiency is baked in.

Five things working together to lower your bills

1. Timber frame construction

Every Hagan home is built using timber frame construction, a method that's faster, more sustainable, and significantly more thermally efficient than traditional builds. Homes are wind and watertight within two days, and the insulation built into the frame can deliver heat-loss savings of up to 50% compared to less efficient construction methods.

It's also a greener way to build: timber uses 20% less energy to process than other materials, and every harvested tree is replaced.

2. High-performance insulation

This is where a huge amount of the day-to-day saving happens. Glass mineral wool insulation in the timber walls minimises air movement and cuts heat loss, while a thermo-insulating breather membrane improves thermal performance and protects the external walls. Ground floor and roof insulation exceed building regulations, meaning your home holds onto warmth for longer, and your heating doesn't have to work as hard to maintain a comfortable temperature.

In practical terms: less energy used, lower bills, warmer rooms.

3. Quality windows and doors

Heat loss through glazing and doorways is one of the biggest weak points in older homes. We use double-glazed uPVC windows and composite entrance doors, sustainably manufactured by Munster Joinery using green energy from wind turbines and biomass CHP power. They're built for performance, keeping warmth in, draughts out, and energy bills down.

4. Integrated solar PV panels

Every Designed Efficient home comes with a minimum of five integrated black solar panels (number and orientation are determined to achieve an A energy rating, and exact spec varies by development).

The benefit? Your home generates its own electricity, even on cloudy days, converting it through a Solis Mini Series Inverter for use in the home. Depending on your tariff, this can save up to £500 a year on electricity costs alone.

That's a meaningful number. With NI electricity rates currently sitting around 26–29p per kWh, every kilowatt-hour you generate yourself is one you don't have to buy at peak prices.

5. Smart heating control with the Ember PS system

Heating accounts for the largest share of most household energy bills, so being able to control it precisely makes a real difference. The Ember PS system comes built into every Designed Efficient home, with a free app that lets you control your heating from anywhere, whether you're upstairs, at work, or away on holiday.

Schedule it, boost it, switch to holiday mode when you're away, manage multiple homes from one account. It's the kind of granular control that turns "leaving the heating on by accident" into a thing of the past.

The green mortgage advantage

There's one more financial benefit worth flagging. Because every Hagan home achieves an A or B EPC rating, our buyers are eligible for green mortgages, a growing category of mortgage products that reward energy-efficient homes with lower interest rates, cash-back offers, or other incentives.

It's a saving on top of a saving: lower energy bills and potentially lower mortgage costs, simply because of how the home has been built.

Why this matters now

Energy prices in Northern Ireland are likely to remain elevated for the foreseeable future. The infrastructure costs, the smaller market, the global pressure on wholesale prices, none of that is going to reverse quickly.

What you can control is the home you choose. A Designed Efficient home gives you a head start: better insulation, your own solar generation, smart heating you can manage from your phone, and an EPC rating that opens the door to better mortgage products.

It's not just a more comfortable home. It's a more affordable one to run, year after year.

Find out more

Every Hagan development brochure outlines the specific Designed Efficient details for that site, from solar panel configuration to heating system specifications. Click here to view our current developments.