How much underlay do i need?

I'm mainly asking because I don't understand if I need underlay under everything or just the main floor area? There are wardrobes and odd corners in the room, so I’m not sure if underlay goes wall to wall or only where the flooring will be walked on. Don't think it'll make much impact to the cost, but just trying to get it as close to a pro as a I can!

Asked by Kamil on 3rd Feb 2026
Expert Trade Answers
"Hi ideally you should underlay the hole room area to make sure you get a even finish if ther is wardrobes ther and your flooring up to them and not under them you should be ok to just get underlay to them but I’m the future it will need doing if ther is wardrobes get moved hope this help"
Answered on 3rd Feb 2026 - Member since Dec 2025 - report
"Underlay should be covering the whole floor so you get an even wear on the carpet. Its always best to get the best Underlay you can afford to give a better feel and a longer lasting carpet"
Answered on 3rd Feb 2026 - Member since May 2020 - report
"Remove the wardrobe and any other items and underlay and carpet the whole just in case you want to alter the layout of the bedroom"
Answered on 3rd Feb 2026 - Member since Mar 2019 - report
"You generally lay underlay wall-to-wall, everywhere the flooring will go — not just the main walking areas. That includes wardrobes, odd corners, and alcoves if they’re getting the same flooring.

Even if those spots don’t get much foot traffic, full coverage keeps the floor height consistent, prevents movement at edges, helps with sound/insulation, and avoids future issues if furniture gets moved around. Installers don’t usually try to pick “traffic zones” — they just blanket the whole room.

The only places you’d skip underlay are areas where flooring itself isn’t being installed (like under fixed cabinets that stay on the subfloor)."
Answered on 3rd Feb 2026 - Member since Feb 2021 - report
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