Planning a home office next to the living room, or turning the garage into a playroom? A new room can look completely separate on the plans and still let every word of a video call through the wall. If quiet matters to you, the time to think about sound is before the walls go up, not once the decorating’s finished.

Sound is one of those things that’s far easier to plan for at the start than to put right later. Here’s what we’d talk through with you, so the rooms work the way you need them to, both together and apart.

Start with who needs quiet, and when

Different noises need different answers. Voices from a video call, the TV in the next room, footsteps on the floor above, a washing machine on spin, and a teenager’s music practice all travel in their own ways. So start by naming the noise, the room it comes from, and the room that needs to be quieter.

Timing matters too. If someone works from home while the rest of the family is out, the needs are different from a household where everyone’s in at once. A bedroom used by a shift worker during the day is a different brief from one only used at night.

Set a realistic goal. Not being able to make out what’s said next door is a sensible aim for a home office. Hearing nothing at all from a busy family room is a much bigger ask. If you need real privacy for confidential work, tell us early, as that may need input from an acoustic specialist as well as the building work.

How sound gets around

There are two main types of sound to think about. Airborne sound, like voices and music, travels through the air and sets walls vibrating. Impact sound, like footsteps and dropped toys, goes straight into the structure. A floor that keeps out voices well can still let footsteps through, and the other way round.

Sound also takes the long way round. It can travel through the ceiling void above a wall, along a timber floor that runs under it, or through the walls either side. This is called flanking, and it’s why improving one wall on its own sometimes makes less difference than people hope.

Gaps are the other big leak. A gap under a door, a poorly sealed edge where a wall meets the ceiling, or sockets placed back to back on either side of a thin wall can let a surprising amount of sound through.

It’s also worth knowing the difference between echo and separation. Soft furnishings and acoustic panels can make a room sound less echoey, but they don’t do much to stop sound passing into the next room.

Use the layout first

The easiest wall to soundproof is often the one you don’t need to build. Placing a hallway, a cupboard, or a run of wardrobes between two rooms gives you a natural buffer. Putting the utility room away from bedrooms, or the home office away from the TV, does a similar job.

Think about doors as well. Two doors facing each other across a short landing can let sound straight from one room into the other when they’re open. If a room will mostly be used with the door shut, a solid door and good seals help. If it’ll usually stay open, the layout matters more than the wall.

Open-plan living is a trade-off. A big, connected space is great for family time, but it gives you nowhere to go when one person needs quiet. If you’re opening up the ground floor, it may be worth keeping one smaller room that can be closed off.

Build the whole boundary

When a wall or floor does need to keep sound out, the whole construction matters, not just one product. Heavier boards, more than one layer, insulation in the cavity, and details that stop the two sides being rigidly connected can all help. Which combination suits your home is a design decision, based on the noise you’re dealing with and the space available.

The edges count as much as the middle. Where the wall meets the floor, the ceiling, and the outside walls should be sealed and detailed properly. Plan sockets, switches, and pipework so they don’t leave holes straight through the wall.

Doors are usually the weak spot. A solid door with seals will do more than a lightweight hollow one. Some internal doors have a gap underneath on purpose, to let air move around the house, so don’t seal it up without checking it isn’t needed for ventilation.

For floors between storeys, footsteps are often the main complaint. Carpet and a good underlay help above, while the ceiling construction below matters too. Recessed lights cut into the ceiling can weaken it, so plan lighting with sound in mind.

Pipes and ducts can carry sound between rooms as well. A waste pipe from an upstairs bathroom running through a ceiling void, or a shared duct between two rooms, can be surprisingly noisy. Boxing them in properly with insulation helps, and it’s much easier to do while the walls and ceilings are open.

Converted spaces need the same thinking. If you’re turning a garage conversion into a study or a playroom, the wall it shares with the house is worth planning from the start.

Building regulations and sound

England’s Approved Document E covers resistance to sound. It applies to walls and floors between separate homes, and to some internal walls and floors in new homes and in buildings being converted into homes. Whether any of it applies to your renovation depends on the work, so your designer or building control will confirm it.

Planning Portal’s guide to building regulations for internal walls is a useful starting point for new partitions. For many alterations to an existing house, there may be no sound requirement at all, even though you still want a quiet room.

So treat the regulations as a minimum where they apply, not a description of what you want. If you need a particular level of quiet, say so, and ask how it’ll be achieved. Our article on building control and regulations explains more about how inspections fit into a renovation.

Agree it, and keep to it

Write the sound requirement into the scope of work, so it doesn’t get lost among everything else. If you’re comparing builders, check that each quote describes the wall, floor, and door construction in the same detail. Our guide to reading a building quote shows what to look for.

Small changes during the job can undo a good plan. Moving a door, adding a socket, or cutting in a downlight all affect the boundary, so check them against what was agreed before they go ahead.

Questions about sound in a renovation

Will a thicker wall solve the problem?

Not on its own. If sound is getting round the wall through the ceiling void, the floor, or a door, a thicker wall won’t stop it. The whole route needs looking at, not just one surface.

Does insulation in a stud wall stop sound?

It helps, especially with voices, but it’s only one part. The boards, the number of layers, how the wall is fixed, and the gaps around it all make a difference too.

Can you soundproof against my neighbours?

Noise from next door is a separate issue from sound between your own rooms. Work on a shared wall can involve your neighbour and the Party Wall etc. Act 1996, and may need specialist advice, so raise it early and we’ll talk through what’s realistic.

Will acoustic panels stop sound getting into the next room?

Not really. They reduce echo inside a room, which can make it sound calmer, but they don’t do much to block sound passing through a wall or floor.

Should I mention future plans for a room?

Yes. If a spare room might one day hold a drum kit, a home gym, or a home cinema, tell us now. It’s much easier to build the right wall or floor at the start than to add to it later.

Is complete soundproofing realistic in a normal house?

Be wary of that promise. Almost every home lets some sound through somewhere. A clear, sensible target, like not hearing speech clearly through a wall, is more useful than a promise of total silence.