Complete autonomy
Full ensuite with shower. Fitted kitchen. Separate entrance. Sleeps up to 6. A standalone home that runs itself from day one — no shared bathroom with the main house, no knocking before the kitchen.
NOOK Double - 19.50m²
NOOK Doble is a 19.5m² self-contained prefab garden room with optional en-suite bathroom and fitted kitchen. Perfect as a guest suite, granny annexe, holiday let, vacation rental or private office with its own facilities. Fully insulated with Energy A certification, double-glazed safety-tempered glazing and 80mm multi-layer rock wool insulation.
Specifications: exterior 5.00 × 3.90m · capacity up to 6 people · installation complete in a single day · reversible helical-pile foundation · 3-year warranty.
Configure online: exterior cladding (heat-treated wood or premium Millboard composite), layout (open plan, with bathroom, with bathroom + kitchen, or with integrated NOOK corner), furniture, pitched roof, terrace, porch, solar power and climate control.
Turnkey delivery: transport, crane, plumbing and electrical pre-wiring all included.
NOOK Double | 19.5m² Prefab Garden Room with Bathroom
Configure your NOOK Double - 19.50m²
NOOK Doble is a 19.5m² self-contained prefab garden room with optional en-suite bathroom and fitted kitchen. Perfect as a guest suite, granny annexe, holiday let, vacation rental or private office with its own facilities. Fully insulated with Energy A certification, double-glazed safety-tempered glazing and 80mm multi-layer rock wool insulation.
Specifications: exterior 5.00 × 3.90m · capacity up to 6 people · installation complete in a single day · reversible helical-pile foundation · 3-year warranty.
Configure online: exterior cladding (heat-treated wood or premium Millboard composite), layout (open plan, with bathroom, with bathroom + kitchen, or with integrated NOOK corner), furniture, pitched roof, terrace, porch, solar power and climate control.
Turnkey delivery: transport, crane, plumbing and electrical pre-wiring all included.
Functional Extras
Upgrades ready to use from day one
Installation & Transport
Complete service to your garden
Transport (Estimated)
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Summary
Base Model—
Options—
Add-ons—
Total Price (excl. tax, excl. transport)—
Deposit
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Got a question? Message us on WhatsApp or book a call. We’ll guide you through every step.
A standalone home, not an extension
19.5 m² of standalone home — full ensuite, fitted kitchen, separate entrance. Installed in one day. The annexe your family actually wants to stay in.
The honest comparison
NOOK vs Traditional Construction
We compare against a professional builder-led extension — not DIY kits.
Category
NOOK
Traditional construction
What the price includes
Fixed price — transport, crane, foundation, plumbing & electrical pre-install, install labour: all in
Variable estimate — transport, crane, permits, trades, contingencies: billed separately
Total timeline
12–16 weeks + half-day install
12–18 months — design, permits, build
Cost certainty
Fixed price before manufacturing
30–40% overrun rate typical
(Houzz UK)
On-site disruption
Half-day install. Minimal foundation.
Weeks of construction: dust in the house, daily trades on-site, timeline slip on 30–40% of projects.
Year-round use
Energy A certified, 80mm insulation, double-glazed safety tempered
Depends on builder and specification
Design & materials
Architect-designed, curated premium materials
Variable, subject to local trades
Warranty & aftercare
3-year NOOK structural warranty + aftercare
Depends on contractor (insolvency risk)
How you'll live it
One space, many lives
Office. Gym. Retreat. Guest room. Your NOOK evolves with you.
Guest suite
Family visits, without the sofa-bed tension.
Full en-suite, fitted kitchenette, separate entrance. Your guests have their own home. You have yours.
Self-contained home
A second home, without the 18-month build.
19.5 m² habitable with bathroom, kitchen, climate control and Energy A certification. For family, for renting, or for yourself.
Short-let rental
Your garden, turned into passive income.
Payback in 2–3 years at 50 nights per year. With bathroom, kitchen and turnkey finish — a luxury short-let product ready to operate.
Private office
A professional office with its own facilities.
Ideal for independent professionals who see clients. Total privacy, without interrupting family life.
The full spec, opened up
Everything included with your NOOK Doble — no hidden extras
A standalone home, turnkey: bathroom, kitchen, transport, crane, foundation, pre-installs and install labour — all inside the price.
What the price includes
- Full factory assembly at our workshop
- Transport to your destination
- Crane hire and offloading
- Helical-pile foundation (where applicable)
- Internal electrical and plumbing pre-install
- Single-day on-site install labour
- Handover and final quality checklist
Full ensuite (optional)
- Shower with tempered-glass screen
- Premium toilet and basin
- Hospitality-grade tiling
- Integrated towel rail and fittings
- Ventilation extractor and LED mirror
Fitted kitchen (optional)
- Worktop with designer tap
- Stainless-steel sink
- Space for undercounter fridge, induction hob and microwave
- Bespoke storage cabinets
- Under-cabinet lighting
Structure & cladding
- Reinforced steel chassis for decades of structural stability
- 50 mm high-density sandwich panel cladding
- Rock-wool partitions for superior fire resistance
- Exterior in thermally-modified timber (black or oak) or premium Millboard composite
- Complies with Spanish fire-safety regulations
Roof & insulation
- 80 mm of under-roof insulation — stable temperature year-round
- 50-year-lifespan EPDM roof membrane
- Double-layer false ceiling — zero thermal bridging
- Integrated aluminium gutters
- Officially Energy A certified
Windows & doors
- High-efficiency PVC exterior joinery
- 2-panel sliding windows (one fixed + one opening)
- Double-glazed safety-tempered glass
- PVC sliding door flush with the floor — no threshold
- Independent entrance with security lock
Warranty & aftercare
- 3-year structural + services warranty
- Aftercare support with defined response times
- Thermally-modified timber: re-lacquer every 5 years
- Millboard composite: zero maintenance
Architecture & craft
A home, specified like the main house.
NOOK Doble is designed to full residential spec: steel chassis, 80 mm rock wool, 50-year EPDM roof, continuous waterproofing under the bathroom, plumbing sized for daily use, certified electrical install. Residential architecture — delivered in a day instead of eighteen months.
— Architecture team · NOOK Prefab
- Thermally-modified timber · exterior
- Millboard composite · premium option
- EPDM roof · 50-year membrane
- 80 mm rock wool · insulation
- Energy A · officially certified
Buy with confidence
Every reason to go ahead, no reason to worry
We take responsibility for the process. You decide if NOOK is right for you.
3-year warranty
Structural warranty covering frame, cladding, glazing and factory-installed components.
Refundable deposit
If our engineers find your site can't host a NOOK, we refund your deposit in full — no questions, no admin, within 7 working days.
Reversible foundation
On helical-pile screws: relocate or remove with no permanent land impact.
Private consultation
30 minutes with our design team. No commitment.
Frequently Asked Questions
Can I put a bathroom and kitchen in a garden room?
Yes — NOOK Double is specifically designed for full bathroom and kitchen integration. The 19.5m² footprint supports a tiled en-suite with shower, toilet and basin, and a fitted kitchen with appliances. Plumbing and electrical pre-installation are included from factory; you connect to the nearest mains water, drainage and electrical points on-site during installation.
Can you put a granny annexe in your garden without planning permission?
In many cases, yes — depending on local rules. A self-contained NOOK Double under 20m² often qualifies under Permitted Development rights or equivalent local permits, especially if it's not the primary dwelling. Rules differ by municipality, so we supply every technical document your local authority needs. Note: overnight residential use may trigger additional regulations in some areas.
How much does a self-contained prefab annexe cost?
A fully-equipped NOOK Double with bathroom, kitchen and 19.5m² of living space is priced at a fraction of a traditional extension or stick-built annexe — and every price is turnkey: foundation, transport, crane, installation, plumbing and electrical pre-wiring all included. Configure online to see your live total based on exact finishes and add-ons.
What's the difference between a granny annexe and a garden room?
A garden room is typically a single insulated space (office, gym, studio) without a bathroom or kitchen. A granny annexe — or what NOOK Double delivers — is a fully self-contained dwelling with en-suite bathroom, kitchenette, sleeping area and living space. Think of NOOK Double as a compact guest house or secondary dwelling, not just extra floor area.
Can I rent out my NOOK Double on Airbnb or as a holiday let?
Yes — many owners monetise NOOK Double as a short-term rental, holiday let or guest suite. At premium nightly rates with 50+ nights booked per year, annual revenue typically lands in the tens of thousands (see our hospitality page for detailed ROI). You'll need to check local short-term-rental regulations and register for tourism licensing where required. NOOK Double's turnkey bathroom, kitchen and premium finish meet guest expectations out of the box.
Can you live permanently in a garden annexe?
NOOK Double has Energy A certification, 80mm rock wool insulation, double-glazed safety-tempered glass and a full bathroom and kitchen — so physically, yes, it's fully habitable year-round. Legal permanent residence depends on your local planning classification (in many jurisdictions a secondary dwelling requires specific permissions for full-time occupancy). We recommend consulting your local authority early.
Can I sleep overnight in a NOOK Double?
Yes. NOOK Double is designed for comfortable overnight stays, with full climate insulation, optional integrated sofa-bed or dedicated bedroom layout, private bathroom, cross-ventilation and warm LED lighting. Ideal for guest accommodation, a self-catered stay, or even as primary accommodation where local rules allow.
Do you pay council tax on a garden annexe?
It depends on the local classification. In the UK, a dependent annexe used by a family member (not rented) typically qualifies for a council tax discount or exemption under the Class W rule. If rented to unrelated occupiers, it becomes a separate taxable unit. Rules vary — ask your local council for a pre-purchase assessment. NOOK Double's reversible foundation is often classified as a moveable structure rather than permanent construction.
How long does it take to install NOOK Double?
Factory production takes 8–10 weeks. The helical-pile foundation is prepped in half a day, about two weeks before delivery. On delivery day, both modules are craned into position and connected to mains water, drainage and electricity — installation is complete in a single day. Total timeline from order to move-in: 8–12 weeks.
Can I customise the layout, cladding and finishes?
Yes — NOOK Double is fully configurable online. Choose exterior cladding (heat-treated wood in black or oak, or premium Millboard composite), interior floor finish (dark, caova or sand laminate), layout (open plan, with bathroom, or with bathroom + kitchen), furniture packages, roof style (flat or pitched), terrace, porch, solar, air conditioning and linen wall coverings. See your live total price update as you build your spec.
