0808 164 1111

The Granny Annexe Building Process

Building a granny annexe is an exciting project for both the homeowner and the person who will move into the annexe. But in addition to excitement, there is bound to be a little bit of stress or worry, especially if you are managing the project yourself or using different contractors for each part of the project.

That isn’t the case when you choose iHUS as your supplier, as we carry out each part of the project for you, meaning you have little to no work and can just wait for the keys to be handed over. Read on for more information on the annexe building process.

Getting Started Building a Granny Annexe

The first steps are often the scariest, but it couldn’t be easier when you use iHUS to build your dream annexe.

Once you have got in touch with us, our tried and tested process is put into motion. One of our consultants will visit you at home to discuss the many options that are available to you.

Our process includes a site survey, design and advice. We review the suitability of your site, listen to your ideas and show you what options are going to be the best options for your family.

Once you have chosen a model from our core annexe range, or even a customised option, the real work can begin.

older couple talking


Annexe Building and Planning Permission

Annexe planning permission is usually considered one of the trickiest aspects of building an annexe but there is no need to worry as we also take care of that for you.

iHUS offer a planning permission service, which is inclusive of the total cost of your project.

Once designs have been finalised and you accept our quote, we start the ball rolling with your Local Planning Authority (LPA), submitting plans and liaising with them on your behalf.

You can read more about our planning service here.

Annexe Building Begins

Once the planning has been submitted, we start work preparing the ground at your property, ready for your brand-new granny annexe. The foundations will be laid and service connections set up for water, gas and electricity.

Meanwhile, your annexe will be constructed in a cassette format, unless we tell you otherwise, in our 2,000 Sq Ft factory in South Yorkshire.

Once the site is ready, your granny annexe will be delivered as a “flat pack” on a Hi-Ab wagon and erected on site. We then fit out your new home both internally and externally to the specification we agreed at the consultation stage.

How Long Does It Take to Build a Granny Annexe?

The process of building a granny annexe, from breaking ground to handing over your keys, will normally take around 6 or 7 weeks.

For small annexes, it may be 5 weeks and for the larger builds, we may need 8 or 9 weeks. As every granny annexe we build is bespoke, the actual timeline will be determined during the first stages.


Contact iHUS

As you can see, the annexe building process is actually quite straight forward – especially when you use a full turnkey service like ours. We take care of each and every part of the project for you, meaning that you can relax and just wait for the keys to your brand-new home.

Feel ready to start your own project?

If you have any questions about our annexe building service or want to book a free consultation, simply get in touch. A member of our team will be happy to answer any questions you may have.

Recent Articles

Quick Links

Find out more...

Check out our planning permission or your money-back pledge
Built to the highest quality with a huge range of options
Book your viewing of an iHus near you

Send for your free iHus granny annexe brochure

Simply add your details below, click send, and we’ll forward your beautiful brochure.

Recent Projects



This 1 bedroom bespoke Annexe is home to a family from South Africa, their Annexe has enabled them to live in an area that they love close to their beloved family and grandchildren. Find out how th...
ihus elf 4


This idyllic annexe is home to Theresa and Austin situated at the bottom of their daughter and son in law’s garden. Having always lived very closely to one another, the family were convinced this w...
Speedwell Annexe


Our customer moved into her Annexe in January and is thoroughly enjoying her lovely new home. She describes her Annexe as 'Warm Sunny Cosy & Comfortable'. Click below to watch an exclusive inte...
Williamson bespoke granny annexe

Jenny Williamson

The Williamsons family moved into their Annexe over 3 years ago. When visiting the family they told us life in their new home exceeded their expectations for many reasons. So much so, they wanted a...

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 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?

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.

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.