The One Bedroom Annexe
From £110,000
Or from £917/month
Complete and ready to move in. Zero VAT under the Caravan Act.
Our most popular size. A separate double bedroom plus an open-plan living and kitchen area, all in 550 sq ft. Suits couples or individuals who want more room than a studio.
Inside the One Bedroom
Practical Layout
At approximately 550 sq ft, the One Bedroom has a separate double bedroom plus an open-plan living and kitchen area. It works well for couples or individuals who want a proper bedroom separate from the living space.
25ft × 22ft
Internal footprint
550 sq ft
Living space
2.4m
Internal ceiling height
1 Bedroom
Separate from living area
Room Breakdown
Everything Included
The One Bedroom price includes everything listed below. No hidden extras. The annexe is ready to move into on handover.
WarmWall 250mm Insulation
250mm thick walls with double insulation. U-value of 0.15 W/m2K, well above Building Regulations requirements. Keeps heating bills low and the annexe warm in winter, cool in summer.
Separate Bedroom
A double bedroom with space for wardrobes, completely separate from the living area. Window positioned for natural light.
Fully Fitted Kitchen
Base and wall units, worktops, sink, integrated oven, hob, extractor, and space for a full-size fridge/freezer.
Bathroom
Walk-in shower (level access, no step), WC, vanity basin, heated towel rail, and chrome fixtures.
Heating System
Energy-efficient electric heating throughout, designed to work with our WarmWall insulation for minimal running costs. Each room has individual thermostatic control.
Complete Electrics
Full electrical installation with consumer unit, ample sockets throughout, LED lighting, smoke and CO detectors. Ready for TV, phone, and internet from day one.
Double Glazing
High-quality uPVC double-glazed windows and French doors. Energy-efficient, secure, and maintenance-free with a 10-year guarantee.
Interior Finish
Plastered and painted walls in your choice of colours, quality flooring throughout, skirting boards, architraves, and interior doors. Move-in ready.
External Finish
Insulated steel panel exterior with a choice of cladding finishes. Low-maintenance construction built to last 30+ years.
Why Families Choose This Design
The One Bedroom is our best seller. Here's why most families pick it over the Studio or Two Bedroom.
Works for Couples
Enough space for two people to live together without feeling cramped. The separate bedroom keeps the living area clear during the day.
Good Value per Square Foot
150 sq ft more than the Studio for £20,000 more. That's a separate bedroom and noticeably more living space for a relatively small step up in price.
Room for Visitors
The living area is big enough for family visits. There's room for a proper dining table, so grandchildren or other family can come round for meals.
Adapts Over Time
If care needs change, there's room for mobility equipment or a visiting carer. The extra space gives you options that a studio doesn't.
How It Works
From first call to move-in, the One Bedroom annexe takes approximately 10 to 12 weeks.
Week 1-2
Site Visit & Quote
We visit your garden, discuss what you need, and give you a fixed-price quote.
Week 3-4
Design & Order
Finalise the spec, sign off the design, and manufacturing begins.
Week 5-8
Manufacturing
Your annexe is built in our workshop.
Week 9-10
Site Preparation
Groundworks and foundations prepared while we finish manufacturing.
Week 10-12
Installation
Annexe delivered, assembled, connected, and handed over.
Technical Specifications
| External Dimensions | Approx. 7.6m × 6.7m (25ft × 22ft) |
| Internal Floor Area | Approx. 51 sqm (550 sq ft) |
| Internal Height | 2.4m (7ft 10in) |
| Bedrooms | 1 double bedroom (separate from living area) |
| Wall Insulation | WarmWall 250mm system (U-value 0.15 W/m²K) |
| Floor Insulation | 150mm insulation (U-value 0.18 W/m²K) |
| Roof Insulation | 200mm insulation (U-value 0.16 W/m²K) |
| Windows & Doors | uPVC double-glazed (U-value 1.4 W/m²K) |
| Compliance | Caravan Act 1968 compliant (BS 3632) |
| Planning Permission | Not typically required (we'll guide you) |
| VAT | Zero rated (0%) |
| Guarantee | 10-year structural warranty |
| Life Expectancy | 30+ years with minimal maintenance |
Frequently Asked Questions
Common questions about the One Bedroom annexe. Can't find your answer?Our team is here to help.
"From the initial design consultation, to planning and construction, the journey has been smooth and stress-free. Mum's new home is beyond our expectations and we're so thankful for making our dream a reality."
The Williams Family, Sevenoaks
Flexible Payment Options
A granny annexe is a significant purchase. Here are the most common ways our customers pay for theirs.
Equity Release
Use equity in your property with no monthly repayments
Remortgage
Add to your existing mortgage
Family Contribution
Split the cost between family members
Savings or Inheritance
Pay outright from savings
Example Monthly Payment
One Bedroom Annexe
£917/month
Over 10 years (120 months)
Representative example only. Actual rates and terms may vary based on your circumstances. We can discuss finance options during your free consultation.
Explore Our Annexe Range
Not sure which size is right? All three use the same build quality and WarmWall insulation.
Studio
From £90,000
From £750/month
400 sq ft • Open Plan
Explore →
One Bedroom
From £110,000
From £917/month
550 sq ft • Separate Bedroom
Currently Viewing
Two Bedroom
From £130,000
From £1,083/month
720 sq ft • Two Bedrooms
Explore →
Get a Free Quote
Book a free, no-obligation site visit. We'll look at your garden, talk through your requirements, and give you a fixed price for the One Bedroom annexe.
Speak to our team
01689 818400Or email us at info@grannexe.co.uk