PrefabX Flip Annexe exterior
PrefabX Flip / Annexe

A two bedroom home, your way, delivered finished in 2 to 3 days.

The Annexe is a complete two bedroom home with a family bathroom, finished and unfolded on your site in 2 to 3 days. Choose Layout A for a separate kitchen with an open living and dining space, or Layout B to open the kitchen and living room into one bright, social heart. The same engineered shell, your choice of how to live in it.

4.9/5 from 336 reviews
From £30,000 £195/mo, fixed price
01743 491181

Prefer to see one first? Book a show home visit

2

Bedrooms

39.9 m²

Floor area

2-3 Days

Installation

50 Year

Lifespan

Owner reviews

112 reviews of the Annexe.

Part of 336 verified owner reviews across the PrefabX range, rated 4.9 out of 5.

4.9

Excellent

Based on 336 verified reviews

PrefabX Owner Reviews

Independently verified
Verified
“I went in expecting the usual sales patter and got straight answers instead. The lead time was a few weeks, not the better part of a year. The attention to detail in the joinery and the kitchen really stood out.”
M

Martin

6 Apr 2026 · Flip Annexe · Ludlow

Verified
“We had looked at every prefab option in the country before we found PrefabX. The nightly rate it commands has made the numbers stack up brilliantly. It is genuinely the warmest, most comfortable space we have ever had. We could not be happier and would do it all again tomorrow.”
A

Adam

27 Mar 2026 · Flip Annexe · Ruthin

Verified
“I will be honest, I was sceptical about prefab until the Annexe turned up. The quality is indistinguishable from a build costing three times as much. There were no hidden extras, the bathroom, electrics and plumbing were all included. If you are on the fence, go and visit the show home, it will make your mind up.”
DV

Dewi Vaughan

20 Mar 2026 · Flip Annexe · Barnstaple

Verified
“We needed somewhere for my mum to live close by but still have her independence. The team answered every question, however daft, and never once rushed us. Our family finally has the room we needed without moving house. Thank you to the whole team, you have been brilliant.”
SM

Simon and Sophie Marsh

10 Mar 2026 · Flip Annexe · Sevenoaks

Verified
“We had a tight deadline and PrefabX hit it without any drama. The attention to detail in the joinery and the kitchen really stood out. The fixed price meant we could actually plan our budget for once.”
HR

Helen and Dewi Ross

27 Feb 2026 · Flip Annexe · Bude

Verified
“Our family had outgrown the house and a normal extension was going to take a year. The fixed price meant we could actually plan our budget for once. The bedrooms are a good size and the living space is brighter than we expected. If you are on the fence, go and visit the show home, it will make your mind up.”
RH

Ruth Holt

23 Feb 2026 · Flip Annexe · Tetbury

Verified
“From the first phone call to the day it was finished, the whole thing was painless. It arrived completely finished, right down to the bathroom and the lighting. It is so well insulated that the heating is barely on, even in winter. I only wish we had done it sooner.”
RM

Rhys Mitchell

22 Feb 2026 · Flip Annexe · Lymington

Verified
“Honestly the best decision we have made in a long time. Delivery and installation were handled start to finish, we did not lift a finger. My mother loves having her own front door and her own space. I would have liked a few more finish options to choose from, but the quality is spot on.”
DS

Donna S.

12 Feb 2026 · Flip Annexe · Oban

Verified
“We needed somewhere for my mum to live close by but still have her independence. The double glazing and thick walls make it warmer than our actual house. The nightly rate it commands has made the numbers stack up brilliantly.”
DR

Donna and Paul Reid

10 Feb 2026 · Flip Annexe · Wells

Verified
“I did not think a building this good could go up this fast. As an Airbnb it photographs beautifully, which is exactly what wins bookings. It is warm, calm and quiet, exactly what we wanted from a home. If you are on the fence, go and visit the show home, it will make your mind up.”
MG

Megan and Laura Grant

7 Jan 2026 · Flip Annexe · Rye

Verified
“I had been quoted a fortune for a normal build, so the Annexe felt almost too good to be true. Walking into the show home is what convinced us, it feels like a real building.”
IG

Iona Gibson

4 Jan 2026 · Flip Annexe · Oban

Verified
“A friend recommended PrefabX and I am so glad they did. There were no hidden extras, the bathroom, electrics and plumbing were all included. The whole site was left clean and tidy when they finished. Best money we have ever spent, no question.”
H

Helen

29 Dec 2025 · Flip Annexe · Buxton

Two bedrooms, two layouts. One engineered shell.

Is the Annexe right for you?

Ideal for: Family home, holiday let, annexe, rental.

The Annexe is for you if:

  • You want a complete two bedroom home without a 12 month build
  • You want to choose between a separate kitchen or an open plan living heart
  • You are adding a holiday let or rental that needs to feel like a real home
  • You value a fixed price with no overruns

The layout

Two layouts. The same engineered shell.

The Annexe comes in two floor plans at the same fixed price. Pick the kitchen that suits how you live. The shell, the dimensions and the specification below are identical.

Annexe Layout A floor plan, Separate kitchen

Layout A

Separate kitchen

A defined kitchen area with a generous open living and dining space alongside. The classic two bedroom plan for those who like a kitchen of its own.

  • Master bedroom
  • Second bedroom
  • Bathroom
  • Kitchen
  • Living and dining room
  • Front door
Annexe Layout B floor plan, Open plan

Layout B

Open plan

The kitchen and living room open into one bright, social space. The same two bedrooms and bathroom, a more connected way to live and a layout that photographs beautifully for lets.

  • Master bedroom
  • Second bedroom
  • Bathroom
  • Open plan kitchen and living
  • Front door

The same size and specification, whichever layout you choose

Model L20
Unfold (L × W × H) 5960 × 6700 × 2548mm
Fold (L × W × H) 5960 × 2300 × 2548mm
Interior ceiling height 2350mm
Floor area 39.9 m²
Net indoor area 37.1 m²
Exterior wall thickness 85mm
Roof thickness 90mm
R value 20
Windows and doors Triple glazed aluminium, blinds fitted free
Packaging 2 sets in 40HC

The offer

Everything you get. And what it is worth.

Every Annexe arrives complete and guaranteed. The home, the full fit out, the installation and the guarantees that remove your risk are all included in one fixed price. Bought separately, here is what each part would cost you.

  • Engineered steel shell and structure, 50 year lifespan £30,000
  • Super insulated walls, roof and triple glazed aluminium windows and doors £13,000
  • Premium blinds fitted to every window and door, included free £1,500
  • Complete fitted bathroom and kitchen, separate or open plan £13,000
  • Full electrics, plumbing and heating, installed £9,000
  • Delivery and 2 to 3 day professional installation £6,500
  • Fixed Price Guarantee, we absorb every overrun £6,000
  • On Time Guarantee, £100 a day credit if we are late £3,500
  • 10 year insurance backed structural warranty £5,000
  • Walk a finished home before you pay a penny £2,000
Total value if purchased separately £89,500+

The Annexe, from

£30,000

All inclusive. £195/mo.

Price anchor

A traditional build of comparable size and spec costs £90,000 to £140,000 and takes 8 to 14 months. You get the same space, a higher build standard, and you save tens of thousands and the better part of a year.

An upgrade most charge extra for

Triple glazed aluminium windows.
With blinds fitted free.

Most prefab buildings, and most new builds, ship with double glazing. Your Annexe comes with triple glazed aluminium framed windows and doors as standard. Quieter rooms, warmer winters and lower energy bills, built in. We also fit premium blinds to every window and door before it leaves the factory. No upgrade fee. No catch.

  • Triple glazed as standard

    Aluminium framed glazing on every window and door, never a paid upgrade.

  • Blinds fitted free

    Premium blinds on every window and door, included in your fixed price.

  • Warmer and quieter

    Three panes cut heat loss and outside noise, so running costs stay low.

  • Built to last 50 years

    Aluminium frames will not warp, rot or rust for the life of the building.

Return on investment

Got some extra room? Fancy some extra income?

Run the Annexe as a holiday let or Airbnb and it can recover its cost around 10 months. Two real bedrooms and a proper bathroom, with the open plan layout that photographs beautifully and wins bookings on Airbnb and Booking.com. Demand for distinctive accommodation on Airbnb and Booking.com keeps these units busy all year.

£150

Nightly rate

68%

Occupancy

£37,230

Annual turnover

around 10 months

Pays for itself in

Model your own return.

Adjust the nightly rate and occupancy for your location to see what the Annexe could earn.

The lowest entry cost in the range, so a compact glamping cabin or one bed let recovers its outlay fast.

£110
£60£350
68%
30%90%

Estimated annual turnover

£27,302

Per month

£2,275

Pays for itself in

12 months

Based on an all in cost of £26,250 for the Studio, VAT included.

*Illustrative example only. Actual income depends on location, season and how you run the let.

Figures are an illustrative example, not a guarantee. Actual income depends on your location, season and how the let is run. Every PrefabX building can be financed, so you can spread the cost while the bookings come in.

Case studies

The Annexe, out in the real world.

Recent Annexe projects, delivered finished and put to work in very different ways.

Their own space on the family farm, up in weeks, On a working farm, mid Wales, a PrefabX Flip Annexe
Home

On a working farm, mid Wales

Their own space on the family farm, up in weeks

A home of their own in weeks

Wanting to stay close for the farm and family but still have a place of their own, this customer went looking for a housing solution after living in a static caravan. They viewed the show home, said yes, and a few weeks later their new two bedroom home was finished, to a far higher standard than anything comparable they had seen.

  • Two true bedrooms and a family bathroom
  • A finish well above a static caravan
  • Viewed and chosen from the show home
  • Delivered and finished in a few weeks
“Definitely a better option than a static caravan, which I have lived in before, and the standard of finish is much higher than anything similar on the market. A few weeks later my new home was up and it was everything I had hoped for.” A farm family home

Installed in 2 to 3 days

A two bed holiday let booked solid by month two, Keswick, Cumbria, a PrefabX Flip Annexe
Home

Keswick, Cumbria

A two bed holiday let booked solid by month two

Booked solid by month two

An investor wanted a year round holiday let that felt like a real home, not a caravan. The Annexe gave guests two proper bedrooms, a separate bathroom and a warm open living space. With its low running costs and strong nightly rate, it paid back faster than expected.

  • Two bedrooms, separate bathroom, kitchen
  • Warm enough to let through winter
  • Fixed price, financed against the bookings
  • Listed on Airbnb within the month
“Guests leave reviews about how warm and well finished it is. The bookings have covered the cost far quicker than I dared to hope.” A holiday let investor

Installed in 2 to 3 days

A grown up annexe, not a converted garage, Tetbury, Gloucestershire, a PrefabX Flip Annexe
Home

Tetbury, Gloucestershire

A grown up annexe, not a converted garage

A real home, not a stopgap

This family needed somewhere for their eldest to live independently while saving for a deposit. The Annexe gave a complete two bedroom home in the garden, with its own kitchen and bathroom, so it worked as a real home rather than a stopgap.

  • Complete two bedroom home in the garden
  • Own kitchen, bathroom and front door
  • Warm, quiet and properly insulated
  • No planning headache, no wet trades
“It is a proper home, not a converted garage. Our son has independence and we still see him for Sunday lunch. Best thing we have done.” A multi generational family

Installed in 2 to 3 days

An open plan home built around the people in it, Aldeburgh, Suffolk, a PrefabX Flip Annexe
Home

Aldeburgh, Suffolk

An open plan home built around the people in it

One bright, social space

This couple wanted two bedrooms but an open, social heart to the home. The Annexe opens the kitchen and living room into one bright space, so cooking and entertaining happen together. The same engineered shell, a more open way to live.

  • Two bedrooms with an open plan living heart
  • Bright, connected kitchen and lounge
  • Premium finish throughout
  • No on site building work
“We can cook and still be part of the room. The open layout is everything we wanted and the light through it in the evenings is gorgeous.” A couple who love to entertain

Installed in 2 to 3 days

A photogenic let that wins the booking, Salcombe, Devon, a PrefabX Flip Annexe
Home

Salcombe, Devon

A photogenic let that wins the booking

Higher rate, more bookings

On a coast full of competition, this owner needed a let that stood out in the listing photos. The open plan Annexe photographs beautifully, which is exactly what wins bookings. Two bedrooms sleep a family while the bright living space carries the gallery.

  • Open plan layout that photographs well
  • Two bedrooms, sleeps a family
  • Warm year round for off season lets
  • Listed across Airbnb and Booking.com
“The photos do the selling for me. It looks far more expensive than it was, and it has not had an empty weekend since the spring.” A premium holiday let owner

Installed in 2 to 3 days

A finished home on a plot that fought every builder, Bakewell, Derbyshire, a PrefabX Flip Annexe
Home

Bakewell, Derbyshire

A finished home on a plot that fought every builder

A home where a build could not go

Access to this rural plot had put off every traditional builder they approached. The Annexe shipped folded, unfolded on the prepared base and was finished without a convoy of trades grinding up the lane. A complete home where a site build was nearly impossible.

  • Two bedrooms with open plan living
  • Delivered folded to a tricky rural plot
  • Finished without a site full of trades
  • Fixed price agreed up front
“Three builders told us the access was the problem. PrefabX folded it down, brought it in and unfolded it. We still cannot quite believe it.” A rural self build family

Installed in 2 to 3 days

Zero risk

We take the risk. You take the building.

Fixed Price Guarantee

The price we quote is the price you pay. If anything costs more than we quoted, we cover it. Not you. Written into every contract.

On Time Guarantee

We give you a delivery date. We hit it. If we are late, you receive £100 credit for every day of delay. We have never paid out.

Quality Guarantee

Walk through a finished Flip before you commit a single penny. Open every cupboard. Check every joint. If it does not meet your standards, walk away.

10 Year Structural Warranty

2 year full coverage on all systems. 5 year structural. 10 year envelope warranty on roofing, thermal boundary and waterproofing. All backed by third party insurance.

Limited production slots

Production is allocated month by month. Current lead time is 4 to 6 weeks.

Each Annexe is built to order on the line and shipped to your slot. When a month fills, it fills. If you want yours installed this summer, the time to lock in your fixed price is now.

Popular uses

What people build with the Annexe.

More in the range

Explore the other layouts.

Finance available on every building, from £160 a month. Spread the cost and let the bookings pay it back. See finance options

Free download

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Floor plans, pricing, full specifications, and real project photos. Everything you need to start planning your build.

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PrefabX Flip brochure front cover
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