Planning on building a granny annexe or any other type of ancillary accommodation? Read on for more information on what ancillary accommodation is, how it is related to granny annexes and how we can help with planning.

What Does Ancillary Accommodation Mean?

Ancillary accommodation or an ancillary dwelling is a small self-contained residence, situated on the same property as another house. Ancillary accommodation can either be a separate building from the man home or attached to a house as an extension.

In the United Kingdom, ancillary accommodation is referred to by several other names; a separate self-contained building is a ‘granny annexe’, or ‘granny flat’. If the accommodation is physically attached to a property it would generally be referred to as an extension.

Ancillary homes are ‘self-contained’, this means that they will usually have all the facilities found inside an ordinary home; bathroom, kitchen and an area to sleep in. This would allow any occupant to live independent of the main house.

There is so much law concerning what constitutes ancillary buildings but to sum it up; ancillary accommodation generally needs planning permission and is a dwelling where you would be able to do anything you would in a normal home; eat, sleep, wash etc.

In contrast to ancillary buildings is incidental building; these are usually built using Permitted Development and include small extensions, outdoor storage and summer houses.

image shows a kitchen in ancillary accommodation


What is Ancillary Accommodation Used For?

Ancillary accommodation is used as an additional living space that is close to, but independent from the main property. The accommodation must be subordinate to the main dwelling and can’t be sold or let, independent of the main property.

Most commonly used to house elderly parents, this is how ancillary accommodation became referred to by the more familiar granny annexe or granny flat.

Elderly parents can be a worry for many people; with rising care costs and the fact that many people don’t want to see their parents in nursing homes, providing a space for ageing parents at home is a popular solution.

Some elderly folk may not want to live on their own, may miss being near their family or need help with daily tasks – another reason ancillary accommodation or granny annexes are a good solution. Grannies may be the term most associated with ancillary accommodation but there are lots of reasons people may need extra living space on their property.

Annexes and extensions can be used as accommodation for disabled family members who have a degree of independence but may still need help in some areas. There has even been a recent trend in the UK of would-be first-time buyers living in ancillary dwellings and annexes on a parent’s property.

Ancillary Accommodation Planning

Ancillary accommodation is a planning or legal term. In addition to being a bit of a mouthful, the term is only really used when it comes down to thinking about planning additional living space on your property.

Whether you call it a granny annexe or granny flat, your ancillary building will likely need planning permission from your Local Planning Authority.

This can be a stressful part of the process for many people when it comes to building additional accommodation. You just want to know the costs and provide a home for a relative, but it can become easy to get bogged down with the ins and outs of planning law.

That’s why here at iHUS, we provide a full planning service for our customers. Choosing us to build your granny annexe means that you don’t have to deal with the paperwork and can get on with your life while we do the work in the background.

image shows an older lady who is on the telephone


Granny annexe planning can be complex so we aim to make it simple.

For more information or if you have any questions, please get in touch.



View Our Annexes

The Cantley is the smallest annexe in our Core range and is one of our most popular models for independent living. The floorplan is designed to maximise space and fits comfortably into most back gardens.
As one of our most popular one-bedroom annexes, the Bawtry is the perfect choice for elderly care or an independent young adult looking for their first home.
The Ravenscroft is a spacious one-bedroom annexe, designed for those with a larger garden plot. All three footprints utilise a central shower room to separate the bedroom and the open-plan kitchen/living area to maximise living space.

Recent Projects

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 interview with the owner and watch their Annexe walk through!
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 another iHus building! Click view to find out more about their story and take a look around their Annexe.

Wendy Hamm

In Autumn 2020 Wendy Hamm and her family approached iHus as they were contemplating an annexe build in their back garden to house Wendy’s mother. Wendy’s mother Jane, 82, was living over an hours drive away from the family. Wendy’s day to day responsibilities meant that visits to Jane were a lot less frequent then they would have wished. Read their story here.

Shelagh Booker

All of our iHus annexe are customised to meet the want’s and needs of their owners. Take a look around Mrs Bookers annexe and listen to what her and her daughter have to say about their iHus annexe journey below.

Download Your Free Annexe Brochure

Simply fill in the form and you will be emailed a link to download our 32 page annexe brochure.

    Simply fill in the form and you will be emailed a link to download our 32 page annexe brochure. Please check your Junk mail if your brochure doesn’t appear in your inbox

    Request A Hard Copy?:

    Download Your Free Annexe Brochure

      Simply fill in the form and you will be emailed a link to download our 32 page annexe brochure. Please check your Junk mail if your brochure doesn’t appear in your inbox

      Request A Hard Copy?:

      Talk to a Consultant

      We know that building an annexe can seem daunting which is why we created our Signature Move process.

      It all starts with a conversation where we want to get to know you better, understand what you need and give you an opportunity to ask any questions you might have.

      To get started complete the form and a member of our team will get in touch to book you an appointment with a consultant…