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Granny annexe costs

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How much does a typical Granny Annexe cost?

An annexe in the garden can be a very cost-effective way of enhancing your property and provide extra living space for relatives. With the typical costs of moving home being over £10,000, building an annexe could be a great option, especially if extra support and care are required as loved ones get older.

Typical annexes we build, start from £72,000 (view our Tiree range), for this, you will get a home that is ready to move into, with deluxe kitchen and shower room all fitted as standard.




The Tiree is a one-bedroom open-plan building, that despite its more compact dimensions, still offers a great deal of space and light due to its clever configuration and large French doors that bring in plenty of light.




Depending on the region you live in you will find that building an annexe is usually a lot cheaper than a comparatively sized flat or bungalow, especially when you take into account all of the other factors that are associated with downsizing, such as stamp duty, legal fees, moving costs. Plus an annexe is cited as being one of the best ways to add value to your property, as many home buyers are looking for an annexe or similar building for elderly care, or the possibility of providing a home office.

Our most popular annexe range is the Islay, a superb building that has character in abundance. Starting from £87,500, the Islay boasts 34m2 of living space, with a separate ensuite shower room, plenty of storage space and a roomy open plan living room kitchen area. The L-shaped layout allows for a greater feeling of space, with wide French doors opening up onto your garden.


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As well as being complete turnkey buildings, we also offer the option of allowing us to take care of the whole planning process. All garden annexes need to go through planning, as they are ancillary to the main house and are to be lived in full-time. Some companies suggest that schemes such as the ‘Caravan Act’ will suffice, but we do not recommend this as it may cause problems down the line if neighbours flag up issues, or if you come to sell the property, our annexes are properly built homes with solid foundations, passing strict building regulations, so are far removed from a moveable building as required in the Caravan Act.

We can submit an application on the client’s behalf at an additional cost of £1954.00 inc VAT.  This includes creating the scaled drawings, planning statement and liaising with the case officer until the decision.

One of the key unique selling points of our annexes is that each annexe we build is bespoke, so while we offer a range of annexe styles as a starting point, each annexe can be modified and designed to meet your unique requirements. This means that we can build annexes that fit into challenging garden spaces, have a more modern or traditional feel, have a range of external finishes, such as cedar cladding, painted render, or cedral cladding, and can be configured internally to meet any mobility issues or preferences. We pride ourselves on the level of customer satisfaction we have provided over the years and love getting stuck into a new project and discussing ideas with clients.


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Care home alternatives.

There can come a time in everybody’s life when they need that extra bit of care and support, whether it is due to old age, economics, or disability. When we talk about old age there is a range of options that are available, with building a Granny Annexe an increasingly popular option.




The care home alternative:

With the recent shock of COVID 19 and the huge impact it has had on all our lives we are finding that a lot of people are considering alternatives to care homes as a way of looking after our elderly loved ones.

Care homes can be an essential decision for a lot of people, where round-the-clock assistance is vital. But for other people who still would like a higher degree of independence, a granny annexe can be a fantastic option.

Granny Annexes bridge the gap, between providing that extra safety blanket of support, while still allowing for a greater degree of independent living. We have found with our customers that this mix is one of the main reasons that they chose annexe living over a traditional care home.

With our annexes, we are building you a home, with your own front door, kitchen, bathroom and all other modern facilities you would expect from a top of the range new build building. With individual access you will be able to invite friends over, have visits from the grand-children and cook your own meals, just as normal. But also have that extra reassurance that your family are nearby whenever necessary or for company. Care homes can be a great way to meet new people and to have that extra level of social support, but we feel with an annexe you will also benefit from similar advantages, especially from those closest to you.


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Carers and Disability:

All of our annexes are bespoke and built to the individual requirements of each individual customer. This means that we listen carefully to your needs before even starting the design process. All of the annexes we build can come with a host of equipment that will make movement and access easier. We can install ramps, handrails, wider doors, walk-in showers and almost all other disabled access equipment in order to make things as easy as possible and to ensure that the annexe is future proof.


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Staying connected:

In this day and age, we understand that staying connected is especially important. All the annexes we build have the possibility to have broadband internet, either shared with the main house or your own line. This way you can always stay connected with old friends, grand-children and other members of the family who might not be living so close. Of course, some of your family will be just next door.


Downsizing compared to a care home:

For many people, the reason to move is that their house is simply too big for them. A once-great family home can become very expensive to maintain, and a large garden difficult to keep on top of. Downsizing can be a very positive experience, decluttering and rearranging your life into a more manageable building can be quite therapeutic. Maybe it could be the opportunity to change your décor style, go shopping for some great new furniture, or a chance to keep the things that mean a lot while getting rid of the mess.  One problem with moving house is the great expenses that are occurred, with legal fees, stamp duty and real estate services. A granny annexe can be a great alternative, with annexes starting from £72,000, the cost of downsizing is greatly reduced.


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The Granny Annexe:

For some, a granny annexe may not have been a consideration, but increasingly people are seeing it as a brilliant way to live a new life, close to their family in a purpose build home. Our annexes are far removed from the old notion of a ‘prefab’, all our buildings are constructed to the tightest building control regulations and are checked and approved throughout the build process. Using structurally insulated panels, our annexe hosts some of the highest U-Values in the class, meaning that you are going to be saving money on heating as well as having a home that stays cool in summer and is warm and cosy in winter.


Click here to book your Free Site Survey

While it’s fresh in your mind why not download a free brochure

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Can a granny annex save me money?

Building a granny annex in the garden is becoming an increasingly popular option for many people wanting to downsize or live closer to their family. An annex is a fantastic way to maintain your independence while also having the security of having family close by for extra support and security. There are also some great financial incentives for building an annex that can help make the move an easy one.



Thermal efficiency

Our granny annex’s are designed and constructed to the same high standards as you would get in a typical new build. Each building is signed off by building regulations and meet strict controls regarding uValues, thermal efficiency and materials. What this means for our customers is that our buildings are very warm and cosy in the winter and therefore quite cheap to heat, especially when compared to a larger, older house that you might be moving from. Typically you might expect to pay no more than £250 per year at current prices for your heating bill.




Our annex’s are constructed using SIPs (structurally insulated panels). SIPs consist of 100mm polystyrene insulation sandwiched between two sheets of OSB board to create a solid structural panel. The rigid integrity of these panels means that the buildings we produce are extremely thermally efficient and strong, with no cold bridging (gaps in the insulation) that is often associated with cheaper methods.

On top of this, we utilise uPVC or aluminium windows and doors with double glazing that provides a real barrier to the elements. Externally our buildings are finished in either red cedar cladding, cedral clading or a render finish, that will provide low maintenance protection for years to come.


Annex costs vs moving house




Moving house can be very expensive. House prices have risen by an average of 14.8% in the last 5 years and many people have found it increasingly difficult to afford a new home. Despite a blip in price growth over Brexit uncertainty – prices in 2020 are set to rise a further predicted 2%. Other costs involved in moving house remain high in the UK, stamp duty, solicitor costs and removal firms all add to the expense, in fact, the average cost of moving home is now estimated to be £8,885.

If you are thinking of downsizing, then an annex could be a much more cost-effective way in which to find yourself in a new home. When moving to an annex there are not the same costs involved, such as stamp duty and solicitor costs. An annex can range in price from around £65,000 to £150,000 depending on the specification and size of the build. In fact, a 2 bedroom annex with 60 m2 can cost as little as £101,000. This is a fraction of the cost of many similar 2 bedroom bungalows in the UK and could represent a huge saving compared to properties in more expensive areas such as London or the South East.


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Care homes costs vs annex living

One of the most popular reasons why people choose to live in an annex is to have family closer together and to have that extra support, while still retaining a level of independence. This can be a great compromise between moving into a care home and staying in your own home. An annex allows you to have family close by if you need them, which can be a great comfort as you reach old age. For some people, a care home might be a necessity, but for others, you might prefer being closer to family.

Care home costs can be extremely high with fees running into the thousands each month, typical care homes cost from £900 per week.

According to, a report by healthcare specialists Laing & Buisson in 2018, care homes costs can range from:

  • £27,000 to £39,000 per year for a residential care home, or.
  • £35,000 to £55,000 per year if nursing is required.


With these types of costs involved, it makes sense that a lot of people are choosing an annexe as an alternative option. After the initial costs of building an annex it is likely you would in-fact see your bills and costs fall as you reap the benefits of downsizing into a brand new highly insulated home.

There are also some other great cost-saving advantages to annex living that arise through living in close proximity to your family. Spending more time with grandchildren is high up there as a reason many people enjoy annex living, and it could also give parents the option of an extra babysitter when required, a win-win for all concerned!

Another nice element of living so close to family is that mealtimes are sometimes shared. While it is delightful to have your own kitchen and have control over your own domain, the chance to pop over to each other homes to share a meal is also very tempting, bringing the family closer together and saving money on cooking and food bills.




Extra costs associated with annex construction

As with all building projects, annex construction does require some extra costs that shouldn’t be overlooked. As an annexe is to be lived in as a home, planning permission is required for all of the annexes that we build. We can submit an application on your behalf for an additional cost of £1954.00 inc VAT. Within this fee we take of everything, this includes preparing your annexe design drawings and submitting these plans to your local planning authority and liaising with your case officer, utilising our breadth of experience in the annex industry. This gives you the best possible chance of success in getting you building through planning.

It is also possible for you to conduct your own planning application at your own expense with the drawings that we provide free of charge, this can be a good way of going about the process if you have some experience in this field.

We are also able to offer a host of services free of charge. Some of these include a free site survey, a free set of drawings that can be altered up to 4 times with no extra charge and up to 20 metres of service connections included in the price. We also offer some optional extras that incur extra charges, such as upgrading to a wetroom, having engineered oak flooring, aluminium windows, or extra service connections. For more details about the optional extras we provide, why not find out more by downloading our free brochure.


While it’s fresh in your mind why not download a free brochure

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What are the expected costs of building a Granny Annexe

Constructing an outdoor building in your home’s garden is often seen as a great investment and a sure way to create added value to your property. An annexe is often created for a very specific need, usually for an elderly relative, or increasingly, for a younger relative who might not yet be able to afford their own home. In both cases, it is a fantastic way to create an independent living solution that will be an asset to your property for years to come.

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All of the buildings that we construct are bespoke and designed especially for each of our customer’s needs. No two annexes are the same. Having said that we can still provide an example of what a typical annexe might cost based on some of the base models that we construct.

Our most compact annexe starts from £55,162.85 inc VAT. The Tiree is a one bedroom annexe with 24 m2 external area (6m x 4m). Comprising of a kitchen-diner and a studio bedroom with en suite. It provides all of the essentials for a comfortable home, while also being small enough to fit into most gardens, either lengthways of longways.


The Tiree, like all of our annexes, comes fully fitted out with a high-end kitchen, shower room and all internal fittings. We offer a complete turnkey service, from design to construction to handing you the keys.

Planning Permission

All of our annexes require planning permission as they are permanent structures designed to be lived in. While a few companies offer annexes built under the ‘Caravan Act’ this is not something we would recommend as if the planning authorities deem the building to not be ‘mobile’ then you might be asked to remove the building. We believe in constructing quality buildings with proper foundations that will last a lifetime.

A full planning service for an additional cost of  £1672.00 inc VAT can reduce many of the stresses of starting a new building project, with us taking care of all or the planning and building regulations you can be sure that your annexe’s planning is in the best hands. Often these initial stages can be some of the most stressful parts of a project, but our team of highly experienced professionals can take the burden out of the process.


Larger Annexes

If you require a bit more space, then an annexe with a separate en suite bedroom normally starts from £59,896.31 inc VAT. With 28 m2 external area, there is capacity for a separate bedroom, kitchen diner and living room. An even larger 2 bedroom annexe with 58 m2 external area might typically start from £100,356.50 inc VAT.


A larger annexe can provide even more space and versatility, it is possible for us to design and construct a 2 bedroom annexe, but it is important to be aware that planning permission might be more difficult to get unless you can provide evidence that 2 bedrooms are required for the purpose of the building.

2 bedroom annexes have a lot of space and can easily accommodate a separate kitchen, study or have an en suite and a bathroom. How you configure your annexe is up to you, we will build your annexe to your specifications and be able to guide you as to what layout and floorplan would work best for you.


A full break down of our prices can be found on our website, with sizes ranging from 24 m2 to 60 m2 external area.


Optional Extras

The size of your chosen annexe, building materials and optional extras, can all affect the price that we send in the quote. Some of the most popular optional extras that we offer are engineered Oak flooring, underfloor heating, ramps and rails and external elements such as decking and lighting. The price for a newly constructed annexe usually varies a little from the list price on our website as many customers would like to make small changes to the shape, size and layout. We have our own team of in-house designers who are able to take care of all the design elements of the project free of charge. After discussing with you your requirements and design ideas we get to work in producing the first drawings, we then send you your quote with a 3-D drawing of your bespoke annexe with a floor plan and a garden aspect plan to help you visualise where everything is going.

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Adding value to your home

It is generally accepted that building an annexe will increase the value of your home at least by the amount that you have spent on its construction. These days many people who are searching for a new home are looking for flexible accommodation, either to accommodate relatives, occasional guests or to use as a home office. An annexe will remain a versatile and useful addition to any home, adding value, space and functionality.

How much does an annexe cost to maintain?

We feel that you will be pleasantly surprised at how little an annexe costs to maintain once it is constructed. We only use the highest quality materials in the construction of our buildings that are built to last. The walls are constructed using structural, thermally insulated panels with either render of wood cladding. This provides excellent protection to the elements and only requires general maintenance in order to keep in lasting order for years to come. Being made from SIPs (Structurally Insulated Panels) means that the cost to heat our annexes is very low compared to a typical house. The excellent thermal performance means that the annexes we build are cheap to heat in the winter yet remain cool in the summer. Modern regulations and building techniques also mean that we only utilise the most modern electrics, with eco-friendly LED lights that cost less to replace in the long term.

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How does the cost of an annexe compare to a similarly sized bungalow?

Costing from between £60,000 – £110,000 for a typical annexe you can expect to make a huge saving compared to the cost of a traditional bungalow, small house or flat in most regional areas. When you build an annexe in most cases the land is already paid for, which can be the most expensive part of a new build project. Utilising your garden to build can be seen as a sure investment with any structure adding value and versatility to your property. With housing in short supply (especially bungalows) it makes increasing sense to build in your garden as the costs of housing is continuing to rise and becoming unaffordable in a lot of areas. When you add this to the practicality and care benefits of having elderly relatives close by then an annexe can make a lot of sense to many families.


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