Katrina’s choice: DORMER WINDOWS

Let in the light and gain more space by installing a dormer window

Adding a dormer window to a loft conversion or extension is the easiest way to increase space, light and ventilation – here’s the lowdown on what you need to know. What is a dormer window; do I need one?

A dormer window is usually seen on a sloping roof (perfect for loft conversions). One reason they’re so popular is that they won’t take up much space as they’re in the roof itself, creating a room that feels bright and spacious. And there is so much choice – whether you have a period property or a new build, there’ll be one for you.

Where is the best place to put a dormer window?

Good question – dormers are usually added to the back of a house but with the correct planning permissions you can incorporate them to the side or front of your property. Try to find a spot that will maximise the light, but somewhere that you can reach easily to open and clean it.

Do I need planning permission?

Converting a loft and/or adding a window shouldn’t require planning permission as it falls under the UK’S ‘permitted development’ rules, but always check with your local authority.

Can I install it myself?

We wouldn’t advise it. Fitting an angled dormer and its frame is a complex task, best undertaken and installed by an insured professional.

What is the difference between a dormer and a Velux window?

A Velux window is easier to install than a dormer as it can be fitted from the inside, so there’s no need for pricey scaffolding or risky walks around the roof. Velux windows tend to offer electric opening and closing mechanisms too. A dormer window requires more structural modifications so it will cost more, but provides more floor space, headroom and, thanks to its wide opening, plenty of ventilation – extra important in a bathroom. Depending on style, size and quality, dormer windows start at around £600 and can go up into the thousands. Research suggests (Nationwide, 2018) that loft conversions and dormers can add around 20% to the value of a three-bedroom home.

‘REMEMBER THAT A DORMER WINDOW NEEDS TO HAVE THE RIGHT SUPPORT AND MUSTN’T ALLOW FIRES TO SPREAD’

SYLVIA JAMES, INTERIOR DESIGNER AT HOMEHOW.CO.UK