Woodend of Glassel: The Story Behind Our First Development
Mature trees, red squirrels and the plot I'd pick for myself. Director Clare Booth on our Woodend of Glassel Passivhaus development. [2 Min Read Time]
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Passivhaus: How To Insulate Your Home Against Soaring Heating Bills
Read Time: 5 minutes
Author. Clare Booth
Director
Author. Clare Booth
Director
Read Time: 5 minutes
•
Heating oil prices more than doubled in early 2026, and Scotland's homeowners are feeling the pressure. Here's how the Passivhaus Standard offers a long-term solution.
Scottish homeowners are bearing the brunt of the current energy crisis. 42% of homes in Aberdeenshire, 31% in Moray and 62% in the Highlands aren't connected to the national gas grid. That means they rely on alternative fuels like heating oil, and after the outbreak of the US-Israeli war with Iran, the price of that oil more than doubled in a month.
Government financial support has helped, but it doesn't address the wider issue. It's not only the price of energy that matters. The way our homes are designed and built has a huge impact on how much energy they need in the first place.
Average home heating oil prices in Scotland, 2026. Source: BoilerJuice
The Homes That Don’t Feel the Energy Crisis
For some households, record heating bills are a problem they've never had. These are the people living in Passivhaus homes.
Passivhaus is a building standard that keeps homes comfortable all year round while using as little energy as possible.
Compared to homes built to current Scottish Building Regulations, a Passivhaus cuts heating demand by 79%. It does this by making the most of free heat: sunlight, the body heat of the people inside, and even the warmth from everyday appliances like a boiling kettle or a running TV.
In a typical home, most of that heat escapes. A Passivhaus keeps it in.
It's no surprise more people are taking notice. By March 2026, there were more than 2,250 certified Passivhaus homes in the UK, and Google searches for "Passivhaus" had risen 86% in just three months. Channel 4's Guy Martin's House Without Bills has also brought the building standard into the mainstream, with one episode following a Manchester home's upgrade to the Passivhaus retrofit standard.
The Scottish Government is paying attention, too. It has set out its ambition for homes to be built to a "Scottish equivalent" of the Passivhaus Standard in the coming years.
Trending Passivhaus keywords in 2026. Source: Google
How Does a Passivhaus Work?
Every Passivhaus, whether new build or retrofit, takes a "fabric first" approach. This means the home's materials and components [the building fabric] do the hard work to reduce the amount of heating needed to keep it comfy.
It's built on eight principles: five building principles and three principles of approach.
01. Continuous amounts of high-performance insulation:
Generous amounts of insulation are firmly packed in, far more than in an average new build. Like a giant woolly jumper, it curbs heat loss in winter and keeps your home cool in summer. The thick insulation also acts as a barrier against outside noise, so your home stays calm and quiet.
02. Airtight construction:
A continuous, high-performance airtight layer is formed around your home. Then any gaps around doors, windows, electrical outlets, pipes and lights are taped and sealed. This stops heat escaping, cuts down on energy use and keeps your home comfortable with no draughts. Two airtightness tests are carried out, one during construction and one after, to make sure your home hits the strict Passivhaus airtightness target.
03. Triple-glazed windows:
Triple glazing keeps the heat in, doesn't feel cold to the touch, and cuts outside noise.
04. Mechanical ventilation with heat recovery [MVHR]:
The lungs of your home, quietly delivering fresh, filtered air 24/7 while recovering heat from outgoing air. Continuous air circulation means your bathroom doesn't steam up, cooking smells vanish and laundry dries faster. If you've got allergies or asthma, the MVHR's filters remove dust, pollen and pollutants, keeping your home healthy.
05. Eliminate thermal bridges:
These are weak spots in a home's outer shell where heat leaks out, often at corners and where different materials meet [e.g. a steel beam passing through insulation]. They become cold spots, which can lead to condensation, damp, mould and even structural decay. A Passivhaus is designed to avoid them from the start, which is cheaper and easier than fixing them on site.
Certified Passivhaus designers and tradespeople will make sure these five building principles are built into your home. However, these alone don't reliably deliver Passivhaus performance. The following three principles of approach are also essential.
The 3 Passivhaus Principles of Approach
01. Strict Performance and Comfort Criteria:
Your home must meet strict targets for heating, overall energy use, summer temperatures, airtightness, fresh air and noise.
02. Passivhaus Planning Package Modelling:
The Passivhaus Planning Package [PHPP] is powerful, physics-based design software. A certified Passivhaus designer uses it to calculate, model and optimise your home's year-round energy use and comfort. It's proven to give accurate predictions of the energy a finished home will actually use.
PHPP is used early, before the big decisions are fixed, like how many storeys your home has and which way it faces. It tests different design options, shows the effect of each one, and flags problems such as overheating or high bills before anything is built. That way, you get the best value for money.
03. Quality Assurance/Passivhaus Certification:
Passivhaus certification is an independent, third-party quality-assurance process that protects your interests. A qualified Passivhaus Certifier reviews the technical drawings and the PHPP energy model, checks detailed construction evidence at key stages of the build and verifies test results [e.g. airtightness]. When all criteria are met, your home is certified and receives the official Passivhaus plaque. Certification gives you confidence that you're living in a genuinely low-energy, high-comfort home.
It's the combination of all eight principles, building and approach, that delivers the Passivhaus Standard. Skip one and overall performance can be compromised.
The Argyle Passivhaus • Angus
Interested in a Passivhaus home?
We've taken everything that makes the Passivhaus Standard so effective and applied it to our range of pre-designed Passivhaus homes, ready to build. It's the fastest, most straightforward route to a home that's comfortable, quiet and costs a fraction of the average heating bill to run.
Author.
Clare Booth
• Director
A trained communicator, Clare co-founded Coldwells Build with the aim of improving consumer experience within the construction process. Working previously as a television director and journalist, she understands more than most, about the power of detail, organisation and timing.
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