From the front, this terraced house in Menai Bridge in Wales looks like any other - just a little smaller than most, perhaps.
Inside, though, it's enormous, thanks to a big surprise at the back. What was once a commercial building attached to the cottage has been incorporated into the property, creating a gigantic living space.
"Blink and you'd miss it, this delightful end terrace house in the very heart of the popular town of Menai Bridge holds a real surprise for someone looking for a private oasis of a home, contemporary, light and designed to maximise the space within," say agents Dafydd Hardy.
As you walk through the front door, all is as you'd expect: straight into a reception room that widens out a little as it goes back.
Behind that though, is a 27-foot kitchen/dining living room that would be more in keeping with a large luxury home.
Owners James and Nerys Owen bought the house four years ago as their first home and set about converting and renovating it, working slowly in stages.
"The back of the house had been added in the early 80s for use as a commercial property before we extended. We moved the stairs from the front lounge to the extension added the first floor with en suite master bedroom and study room," James tells Wales Online.
The huge room at the back has been decorated in Scandi style, with high-gloss white units and stainless steel worktops.
Upstairs, there are two bedrooms, both with en suite bathrooms, as well as a study. Outside there's a garden with garage and off-street parking and it's for sale for £195,000.
As the cottage shows, you should never judge a book by its cover - nor a house by its apparent size.
Earlier this year, for example, we reported on a Shropshire mid-terrace with an even bigger secret inside - a 28-foot by 22-foot cave.
And in Scotland you'll find the house with the narrowest frontage in the world - just wide enough for a slimline front door. Inside, though, it opens up to make room for a bedroom, bathroom, lounge and kitchen area.