Granny Annexes vs Care Homes in the UK:
Is a granny annexe cheaper than a care home?
Yes – in most cases, a granny annexe is significantly cheaper than a care home. A Green Retreats garden annexe typically costs £77,000–£120,000 as a one-time investment, whereas UK care homes average £44,000–£80,000 per year. Over a 5-year period, a garden annexe can cost around 80% less, while also retaining value as part of your property.
Why families are choosing garden annexes over care homes
As care home fees continue to rise, many UK families are looking for alternatives that support independence, safety, and proximity. At Green Retreats, the UK’s leading garden room company since 2005, we’ve seen a growing shift toward garden annexes as a long-term living solution for older relatives.
A garden annexe offers:
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A comfortable, private, self-contained home
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Independence with family support close by
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A significant long-term financial saving
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A building that adds value to your property
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A warmer, more personalised lifestyle than institutional care
What is a granny annexe?
A garden granny annexe (or garden annexe) is a self-contained living space built in the garden of your existing home, providing privacy and independence for an elderly relative while keeping them close to family.
Typically, a garden annexe includes:
- Bedroom(s)
- Bathroom
- Kitchen or kitchenette
- Living/dining area
Garden annexes can be custom-built to suit your family’s needs, from accessible designs for limited mobility to premium finishes for comfort and style. At Green Retreats, our annexes are designed for year-round use, constructed with sustainable, eco-friendly materials, and come with a turnkey installation service – no hidden costs, no hassle.
Granny Annexe vs Care Home: Cost Comparison
5 Year Cost Comparison: Granny Annex Vs Care Home
Key takeaway:
A Green Retreats annexe can cost £355,000 less than a care home over 5 years. And unlike care fees, an annexe remains a tangible asset within your property.
| Scenario | Year 0 | 5-Year Running Cost | Total Over 5 Years | Asset Retained? |
|
|
£77,220 | £10,000 | £87,220 | ✔️Yes, adds property value |
|
Retirement Apartment (Purchase) |
£300,000 | £35,000 | £335,000 | ✔️Yes, resale value (but subject to exit fees) |
Retirement Village (Rent) |
£0 | £120,000 | £120,000 | ❌ No equity |
|
Care Home |
£0 | £442,000 | £442,000 | ❌ No equity, fees lost |
This comparison highlights just how cost-effective a garden annexe can be. Over five years, a Green Retreats annexe such as The Nest costs around £87,220 in total, a fraction of the £442,000 average cost of care home fees for the same period.
Even when compared with other retirement living options, the annexe offers exceptional long-term value. It’s a one-time investment that adds to your property and provides lasting independence and comfort—without the ongoing costs of renting or care fees.
How long do people typically stay in care homes?
According to Care HQ, the average length of stay in UK care homes is around 2.5 years.
This is important because:
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Care home costs compound quickly
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Most families pay tens of thousands per year
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A one-time annexe investment often pays for itself within this typical stay length
This is one of the strongest reasons families choose an annexe as a long-term alternative.
The Top 5 Lifestyle Benefits of a Garden Annex
Cost is only part of the decision. Many families choose an annexe for the lifestyle and well-being advantages.
5 Annexe benefits at a glance:
- Independence: A private home with autonomy
- Proximity: Family support is just a few steps away
- Quality of life: Familiar, comfortable surroundings
- Customisation: Accessible layouts, dementia-friendly design options
- Future-proofing: Adapts easily as needs change
While care homes offer regulated, professional care, they cannot replicate the connection, comfort, and privacy of a bespoke garden annexe.
Is a Garden Annexe the Right Choice?
A Green Retreats garden annexe is ideal when:
- Your relative is reasonably independent, but you want them nearby
- You prefer long-term financial planning and want to avoid escalating care home fees
- You want a customisable, comfortable home rather than a standardised care facility
When is a care home the better option?
A care home remains most appropriate when someone requires:
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24/7 nursing care
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High-level dementia support
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Continuous medical assistance
Shop The Annex
Granny Annexe Vs Care Home FAQ’s
Granny annexes intended for full-time living will either require planning permission and meet building regulations, or must comply with the Caravan Sites and Control of Development Act. At Green Retreats, we offer 3 garden annexe designs, one of which requires planning permission, and the other two generally do not, built under the Caravan Act.
If you do require planning permission, we have an in-house planning team that manages the entire planning process to ensure everything is compliant and stress-free.
Our granny annexe prices start at £63,090 for a 5m x 3m Building Regulations-compliant annexe, offering a high-quality, permanent living solution. All our annexes come with everything you need to make them move-in ready, including kitchen, bathroom, heating, and electrics, as well as building essentials like foundations, cladding, and plumbing, included in the base price.
Depending on the occupant’s lifestyle and needs, a 1-bedroom annexe can be built as small as 5m x 3m all the way up to 14m x 3.5m. At Green Retreats, our design team recommends a minimum size of 6m x 5m annexe, which requires a separate bedroom, bathroom, and living area.
Yes, a granny annexe adds valuable space to your property, which the use can evolve over time. It is estimated that it can add up to 20-30% to the property value, depending on the size and quality of the building.
Explore the potential of an annexe at our showrooms!
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