Energy efficient Annexe home design

Welcome to the home of energy-efficient home builders.

Providing an eco-friendly process and service is equally important to us as providing the highest quality annexe homes. 

If you’re looking for an energy-efficient builder, look no further. The many materials that go into creating each of our unique annexes have been carefully selected for their green qualities and optimal performance to guarantee the most energy-efficient solution for our customers. Our Annexe homes are indeed 20% more thermally efficient than other builders. 

From using several recycled products and FSC-stamped timber, from the foundations to the finishing touches, our annexes are built with the environment at the forefront of our minds. This culture flows through our entire business model, not just our products. From our delivery methods, waste recycling, and quality management accreditations, iHus is an energy-efficient Annexe builder you can trust to put our customers and the environment first. 

Don’t just take it from us. Visit an Annexe in the flesh to discover the high-quality build and efficient performance with our unique Open Hus show home offer.  Or, if you don’t fancy the trip out, chat with one of our customers about their Annexe home over the phone…find out everything you want to know about Annexe living from the Annexe owners themselves. 

Energy efficient building materials

At iHus, we use only the highest-quality materials to construct each of our Annexe homes. This means you won't have to worry about poor insulation or energy wastage throughout your home, as our carefully selected products are designed for maximum energy efficiency.

Here are just a handful of the products, suppliers, and methods we use to build each iHus;

  • Doors & Windows: ‘A Rated’ PVCU doors and 22mm double-glazed energy-efficient windows are fitted as standard.
  • Timber Frames: Part L-compliant super-insulation and traditional FSC-compliant timber frame. 
  • Roofing: Flat EDPM rubber recycled roofing as standard, with a pitched design upgrade option available. 
  • Flooring: Sustainable quick-step laminate & vinyl flooring. Our wooden and laminate flooring contains only recovered wood, which is wood collected from sawmills, sustainable forest management processes and roadside maintenance that would otherwise be burned or discarded. 
  • Decking: Saige composite decking made from 100% recycled materials.
  • Heating and Boiler Systems: Rionte radiators and water heaters are one of the most energy-efficient electric systems on the market and are installed as standard in each of our annexes, keeping your water hotter for longer. With each rionte heating product, trees are contributed to reforestation efforts which help reduce C02 emissions, help rebuild habitats for flora and funa, and more.
  • Lighting: LED efficient lighting is installed throughout each room.
  • Cladding: Our durable, hard-wearing cladding materials are built to last and are fully recyclable after use. 
  • Solar Panels: We are always looking for new ways to improve the energy efficiency of our annexes; that’s why we offer solar panel packages on our annexe homes.
  • Ventilation: Our unique build process exceeds current building regulations, meaning our annexes are warm in the winter, comfortable in the summer, and well-ventilated all year round.

View a real customer show home, designed and built by an energy-efficient builder and loved by a real customer. Discover the high-quality furnishings and cosy warm buildings we produce up and down the country, with a visit guided by one of our real Annexe owners.

What Goes into Making our Annexes?

Only carefully selected products are used to create our annexes. Each has a traditional solid timber frame, all FSC or PEFC Certified from the world's most trusted sustainable forestry standard. We use Saige composite decking created with recycled plastics and wood fibres. We also use almost no concrete (the world's second most significant contributor of carbon emissions), and instead, we use screw piles for our foundations. We use rubber made from recycled products to form the roofs of our annexes, along with cladding that has a long life span and is fully recyclable after use.

Our Recycling Process

Although we keep our waste production to a minimum, the waste we produce from our warehouse and office facilities is recycled using Biffa. This means our waste is removed and recycled sustainably via an efficient and reliable local service.

What's more, the insulation of each of our annexes is installed in our on-site warehouse so that all waste is used and recycled in the next job that leaves the factory.

ihus - energy efficient home builders

Eco-Friendly Delivery Procedure

Using a more sustainable delivery process, we have reduced our carbon emissions by approximately 60%. We use local supplier branches for each of our jobs up and down the country instead of having each one delivered from our local branches, this reduces emissions and limits the number of vehicles we require on Britain's roads.

What's more, we have further reduced our carbon footprint by upgrading part of our fleet of vehicles to fifth-generation hybrid electric power.

Off-Site Preparation

Because we construct most of our homes in our on-site purpose-built premises, we reduce greenhouse gasses by up to 30%. We also use off-site machinery, reducing these gasses by approximately 50%.

Our Commitment to Part L

The Energy Efficiency Part L includes an assessment based on the heat loss in our annexes and raises the overall energy performance of the homes that we build.

We have achieved a lower U value to comply with Part L, meaning that our customers receive more insulation to limit heat loss in their homes, lowering heating costs and in turn, the environmental impact of our annexes.

Theresa McCoy
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''Our iHus is so comfortable and warm all year-round. We would definitely recommend this way of life to anybody. Our advice is don't think about it, just speak to somebody at iHus!''
Carolyn Massey
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"It is no exaggeration to say that iHus has changed our lives. The beautiful annexe they have built for us has enabled our family to stay together with peace of mind and comfort into the future. From start to finish; planning, design, build - to the handover of keys, the process was managed with both professionalism and with warmth and understanding of our needs. Our annexe is efficient with running costs, we couldn't be happier!''
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"We had an annexe built by iHus next to our home in Stafford for my mum in late 2021. We had a ramp added in Feb 2022. My mum is very settled in the annexe (it's always a big hit with visitors!) and it's proved warm and cosy during the cold months."
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"'The workmanship is excellent, I felt looked after throughout the whole building process. Everything seemed to run like clockwork from beginning to end. Thank you for my new home - I love it."
J Foster
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"'We are delighted with the house - everything is up to our expectations and more. The workmanship is superb. Thanks to all concerned, we are very happy and comfortable living here."
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"'I just want to pass on my sincere thanks for the recent completion of my annexe. I am extremely pleased with not only the finished build but also the way Chris and his team were so helpful and professional."
Harley & Stuart
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"iHus have just completed an annexe for my daughter, to enable her to live sem independently. She and I are absolutely delighted with the result. The modern finishes and systems-such as an underfloor heating & smart shower have made the transition possible and enjoyable."
J Haughton
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"The whole team from the office, to planning experts, to the tradesman on site could not have been more accommodating and professional. My mums new home is beyond our expectations and we are so thankful for iHus for making our dream a reality. "
L Brown
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"iHus has been a problem free build from looking in the brochure, making the order throughout the build and to completion. Queries we have had have been dealt with effectively and in a friendly manner all the workmen on site were amazing! We now have an annexe for my mother in law to live close by and that she could plan and choose the build and interior of."
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''I cannot fault the professionalism, speed and dedication of iHus through our process. They make you feel you are in safe hands, and having visited a couple of projects, I know we would be. I would highly recommend iHus. The planning aspect of such project would be impossible on your own, they make everything possible. They can turn dreams into reality. Thank you Wane, you have been brilliant. Thank you iHus.''

Our Solar Panel Offering

Whether it’s a first step on the property ladder, alternative care option for retirees or simply a spare guest room in the garden, we’re constantly looking for ways to enhance our provision of custom-built annexes . That’s why, we’re thrilled to announce, we now offer a solar panel service for our custom-built annexe homes. From reducing energy bills to turning your property into a small-scale energy supplier, here’s everything you need to know about granny annexe solar panels…

Our Annexes

Over the past two decades, we’ve brought the freedom of independence to individuals across every part of the UK with our stunning collection of detached homes. Better still, we’ve enabled families to enjoy all the benefits of true multigenerational living.

iHus annexes - welcome home to quality

To date, we’ve planned and built over 400 high-quality annexes, so you can trust us to deliver a place you’ll be proud to call your home.

Built around you

Everyone’s needs and wish lists differ, so we offer a multitude of choices at every stage to ensure your new home is perfect. Indeed, each annexe design in our stylish collection really is just the starting point, which is why no two iHus homes are ever identical.

Quality and choice

For the ultimate flexibility, each iHus is available in three different sizes and with one or two-bedroom options – and you can select from a flat or pitched roof across our entire collection. But the choices don’t end there. We also give you the opportunity to fully customise your iHus to reflect your needs and individual style. And our experts will be by your side to help you choose from our generous menu of options and finishes.

The Wheatley is our most popular two-bedroom granny annexe, providing plenty of living space and two good sized bedrooms. This model is a product o...
The Hatfield is a spacious L-shaped annexe with two great sized bedrooms. All three footprints look stunning and are ideal for large corner plots.
All three footprints offer an alternative layout with a central living space and bedrooms at adjacent sides of the annexe. If you love large open-p...
The Melton is designed with a master bedroom and a smaller second bedroom that can be used as a home study if preferred. The ‘Extra Plus’ provides ...

Pamela, 71

From Devon

Next steps

Your iHus journey begins with an initial call to get to know you a little better and to understand your needs.

Talking to one of our iHus Annexe Experts we can answer any questions you might have and lay the groundwork for your perfect iHus Annexe.

We begin by getting to know you personally. chatting to you via zoom in your free virtual consultation will help us to understand your personal family situation and your needs so that we can build an iHus that is perfect for you.

We’ll also get to know about the plot of garden land you have in mind to situate the annexe. Its size, shape and orientation – as well as your available budget so that we can plan ahead.

Next, we’ll chat through the best size and layouts for your new home to perfectly match your unique requirements and personal preferences. This includes whether you would prefer one or two bedrooms, as well as how we can design your iHus in a way that reflects your lifestyle.

Talk to our experts

Whatever your current situation or plans for the future, it is always good to talk to someone. To discuss your options with one of our experts, complete the form below, and we will get in touch.

Book your Free Open Hus Visit

If you would like to view an annexe show home, please complete the form below. Have any further questions, why not request one of our team get in touch?


    Download our iHus annexe brochure

    Download our iHus annexe brochure

    If you would like to download our annexe brochure, please complete the form below. You can also request for a hard copy to be posted to your home address. Have any further questions, why not request one of our team get in touch?

    If you would like to download our annexe brochure, please complete the form below. You can also request for a hard copy to be posted to your home address. Have any further questions, why not request one of our team get in touch?


      Talk to an expert

      Whether you’re looking to build a garden annexe, or just have a quick question, get in touch with us today and one of our friendly team will get back to you.

        Download our iHus annexe brochure

        If you would like to download our annexe brochure please complete the form below. You can also request for a copy to be posted to your home address. Have any further questions, why not request one of our team get in touch?


          Get in touch with iHus

          If you want to speak to one of the team about how Multi-Generational Living can be achieved by building an annexe. Complete the form below.

            Is an Annexe right for you?

            Save time scrolling and speak with one of our annexe experts to find out if an annexe would work for you and your family.

              Download our Annexe Financial Guide

              If you would like to download our annexe finance guide please complete the form below. Have any further questions, why not request one of our team get in touch?

              Download our iHus annexe brochure

              If you would like to download our annexe brochure please complete the form below. You call also request for a copy to be posted to your home address. Have any further questions, why not request one of our team get in touch?

              Download Your Free Annexe Brochure