AECB Design for Low-Energy Homes

A simpler path to a better-performing home

We help homeowners create healthier, more efficient spaces using the AECB low-energy design standard—a flexible, fabric-first approach rooted in building science.

Minimalist living room with natural materials, soft light, and sculptural details

Little Venice Townhouse - EnerPHit retrofit

A Practical Standard for Real Homes

We use AECB design principles to help homeowners make meaningful improvements to energy use, comfort and air quality—without over-complication.
It’s based on the same science as Passivhaus, but tailored to fit real homes, real budgets, and the character of existing buildings.

Natural insulation materials used in low-energy retrofits: wood fibre, cork, hemp and recycled wool

What this means for your home

  • Energy Modelling: We use PHPP to understand your home’s performance and guide decisions

  • Airtightness Strategy: Careful detailing to reduce drafts and heat loss

  • Ventilation Design: Fresh air in, stale air out—without wasting energy

  • Fabric-first Upgrades: Natural, breathable materials that protect the building and those who live in it

  • Phased Planning: If needed, we can break the work into manageable stages

Which is Right for Your Project?

AECB Standard EnerPHit (Retrofit) Passivhaus (New Build)
Space Heating Demand ≤ 40 kWh/m²/yr ≤ 25 kWh/m²/yr ≤ 15 kWh/m²/yr
Airtightness ≤ 1.5 ach@50Pa ≤ 1.0 ach@50Pa ≤ 0.6 ach@50Pa
Primary Energy Demand ≤ 120 kWh/m²/yr ≤ 120 kWh/m²/yr ≤ 120 kWh/m²/yr
Certification Optional Required Required
Best For Upgrades to existing homes, phased retrofits Deep retrofit of existing homes High-performance new builds

Read more about EnerPHit or Passivhaus design

Let’s Talk

We’ve helped London homeowners make smart, confident retrofit decisions — from light-touch upgrades to full EnerPHit overhauls.
We’d love to help you do the same.

Book a call to talk through your project.

No pressure. Just useful, honest advice from a team who cares about homes that work — and last.

Our latest articles.

Sustainable Architecture Blog
How To Insulate A Period London Home

Insulating your home has many benefits, not just for the environment but also for your wallet. Achieving appropriate levels of insulation with the right materials not only helps lower greenhouse gas emissions but also minimises heat loss and reduces overall energy consumption.

Insulating your home is a win-win situation for all. 

In this article, we will delve deep and discuss the importance of a holistic approach and best sustainable practices for both internal and external insulation.

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The Case For Daylight

Have you ever wondered how natural light can transform a space, bringing warmth and vitality into your home? Conversely, have you thought about the potential challenges it can create? Striking the right balance between embracing daylight and managing its drawbacks is essential in residential design.

Daylight has advantages and disadvantages. An outstanding design should consider both.

This article outlines the aspects to consider, giving tips and creative design solutions for drawing daylight in to your new or refurbished home.

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How To Improve Indoor Air Quality

The subject of indoor air quality is about more than just stuffy air; it is about air pollution inside your home.

Indoor air quality is a hidden concern that affects our health, comfort, and overall well-being. With modern homes becoming tighter and more energy-efficient, the very things that keep our homes cozy could also be trapping pollutants inside. From dust and pet dander to volatile organic compounds (VOCs) emitted from furniture and cleaning products, the sources of indoor air pollution are plentiful and often unnoticed.

Improving your indoor air quality isn’t just a noble endeavour; it's essential for creating a healthy environment for you and your loved ones. Understanding the key aspects contributing to poor air quality is the first step, and implementing effective strategies can transform your living space into a sanctuary of freshness. In this article, we'll explore the key factors affecting indoor air quality and unveil the best design solutions that will help you breathe easier in your own home.

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