The average sofa has a seat depth of at least 60cm, which gives plenty of room to manoeuvre if you have long legs, and allows you to tuck them under if you're shorter. But seat depths do vary, so definitely try out different styles to ensure you get good back support. When it comes to seat height, most designs are between 45cm and 50cm high

it’s also important to consider how you like to lounge. 'For example, if there are two of you and you both like to sit with your legs up, then check that the sofa is deep enough to accommodate you both. Or consider a chaise end or recliner sofa, if you have the space to accommodate one.

'If you prefer to lie down on your sofa, make sure that it’s long enough for you to stretch out. Taller people may also like to consider a sofa with a higher back to offer extra support.'

2. INVEST IN A GOOD FRAME

Spend as much as you can afford on a quality frame – it will see you through many years of lounging. A solid hardwood frame is a good option, but be wary of a particleboard or metal construction. Also, take note of the guarantee before you commit – always opt for manufacturers who offer at least a 10-year guarantee.

3. CHECK THE CUSHIONS

Remember that what's inside a sofa is just as important as what's used on the outside. When it comes to the sofa back and seat, feather-filled cushions are high on comfort but they will need regular plumping, while foam or fibre fillings may flatten out and lose their shape over time

choosing a combination of feather and foam as 'feathers give the squish while the foam provides structure'. Back cushions filled with feathers and seat cushions filled with foam or fibre works well.

4. FOCUS ON FABRIC

Whether you go for a bold colour, pattern or a neutral, your choice of upholstery fabric will have a huge impact on the room, so choose carefully to ensure it fits with your scheme. Natural materials may fade in strong sunlight so go for a synthetic fabric if the sofa will be near a window. It's particularly important in a busy family home, and if you have a dog or cat, opt for a fabric that's easy to spot clean. In this case, loose covers are worth investigating, as they can be removed for cleaning and some are washable too.

5. MEASURE UP

Before you do anything, measure up. Get out the tape measure and make sure you're certain of the maximum sofa dimensions that will fit, and suit, your space.

it’s important to note both the width (the measurement across the back of the sofa) and the depth (the measurement from the back of the sofa, to the front). 'Pay attention to the depth of the sofa if you’re buying for a smaller room, as the depth of the seat rarely changes from the larger to smaller size sofas,' she says. 'And consider the height of the sofa, particularly if your room has radiators or shelving.'