Knocking two rooms together sounds simple until you notice that one floor sits a few centimetres higher than the other. It’s common in older houses, and even more common where an extension, a converted garage, or earlier alterations meet the original house. Taking the wall out doesn’t make the step disappear. So before the design is fixed, it pays to work out why the levels are different and how you want to move through the finished space.
We come across this a lot on full house renovations around Widnes and the North West. Here’s how we’d approach it with you, so the step gets sorted on paper rather than halfway through the build.
- Find out whether the difference is in the floor coverings or the structure underneath.
- Decide which routes through the house really need to be level.
- Keeping a step, raising a floor, and lowering one all have knock-on effects.
- Check damp protection, structure, and services before any floor is changed.
- Fix the finished floor levels on the drawings before doors and flooring are ordered.
Why the floors don’t match
Sometimes the difference is only skin deep. Tiles on a screed in one room and carpet on boards in the next can leave a noticeable lip, even when the floors underneath line up. Other times the floors themselves are built differently. A suspended timber floor in the front room and a solid concrete floor in the back, for example, are rarely at exactly the same height.
Extensions and conversions are a common cause. A rear extension may have been built to a slightly different level from the house, and garages are often lower than the rooms beside them. Older houses can also have floors that have settled or been patched up over the years in ways nobody wrote down.
Knowing the cause matters, because each one points to a different fix. A difference in floor finishes might be solved with the right build-up. A difference in the structure might need a much bigger decision. We’ll look at what’s there, measure the levels properly, and where needed lift a board or two to see what’s underneath, rather than guessing from the surface.
If you’ve noticed cracks, a floor that feels springy, or a slope that seems to be getting worse, mention it early. That’s something to investigate on its own terms before anyone plans to cover it with a new floor.
Think about how you’ll move through the space
Before choosing a fix, think about the everyday journeys. Carrying a tray from the kitchen to the table, pushing a pram or a vacuum, or helping an older relative through the house all feel different with a step in the way. A small change in level that looks harmless on a drawing can be a trip hazard right where people turn a corner or come through a door.
Work out which routes really need to be level. The main route from the kitchen into the living area might be a priority, while a step down into a quieter snug might be perfectly acceptable. Being clear about this helps us put the effort where it counts.
Where a step or slope stays, it needs to be designed properly, not left as an afterthought with a strip of trim. The government’s Approved Document K covers stairs, ramps, and protection from falling in England. Your designer or building control can confirm what applies to your layout.
Your options
There’s rarely a single right answer. These are the main routes we’d talk through with you:
- Keep a step, but plan it. A single, clearly visible step in a sensible place can be fine, and it avoids bigger work. It works well away from doorways and tight corners.
- Raise the lower floor. This can bring two rooms level, but it takes height from the room and affects doors, skirting, sockets, and radiators. The build-up has to suit the existing floor, including its damp protection.
- Lower the higher floor. This is usually the bigger job. It can involve digging out, new damp protection, and checks on foundations and services, so it needs proper investigation and design first.
- Use a gentle transition. Over a longer distance, a shallow slope can sometimes replace a step. It needs enough room and careful detailing so it doesn’t become a trip hazard of its own.
- Change the layout. Moving the opening, or keeping part of the old wall, can shift the change in level to where it causes the least trouble.
Damp, structure, and services
Changing a floor can affect how it keeps moisture out. Solid ground floors rely on a damp-proof membrane, and suspended timber floors rely on ventilation underneath, usually through airbricks. England’s Approved Document C covers resistance to moisture in floors. Raising a floor or covering an airbrick without thinking this through can cause problems that only show up later.
If the wall between the rooms is load-bearing, the opening and the floor need planning together. A structural engineer designs the beam and its supports, building control approves it, and we build to that design. Our article on removing load-bearing walls explains how that side of the job works.
Pipes, heating, and cables often run in or under floors. They need finding before any floor is lifted or dug out, and moving by qualified trades where necessary. Please don’t dig or cut into a floor yourself to find out what’s there.
Extensions and conversions
If you’re adding an extension, agree how its floor will meet the existing house before the foundations go in. The drawings should show the structural floor level and the finished floor level, including the thickness of insulation, screed, and flooring. Our single storey extension guide covers how floor levels fit into the wider build.
The same applies when converting a garage or joining an older extension to new work. It’s much easier to set the right level at the start than to deal with a step once the floor is laid.
Pin down the levels on paper
Before doors, skirting, and flooring are ordered, the finished floor level for each room should be agreed and written on the drawings. Include the flooring you’ve chosen, because a thick tile and a thin vinyl give very different finished heights.
If the level changes once work starts, the doors, thresholds, and joinery that depend on it need checking too. Keep the updated drawing with the job so everyone works from the same version.
It’s worth planning how you’ll live in the house while the floors are being done, too. If the only route to the kitchen or the back door runs across the area being worked on, we’ll need to agree a safe way round for a few days. Sorting that out before the start saves a lot of hassle once the floor is up.
Questions about joining rooms at different levels
Will using the same flooring throughout hide the step?
It’ll make the rooms look joined up, but the step will still be there. Matching flooring works well once the levels underneath have been sorted, so treat it as the finish rather than the fix.
Can a garage conversion floor be brought up to the house level?
Often, yes. The floor is usually built up with damp protection, insulation, and a new finish, which can close the gap with the house. The exact build-up needs building control approval, so it’s designed as part of the conversion.
Is a single step inside a house allowed?
There’s no general rule that every floor in an existing house must be level. A lone step can catch people out, though, so if one stays it should be clearly visible and away from doorways and tight turns where possible.
Will raising a floor affect my doors?
Usually. Doors may need trimming or replacing, and skirting, sockets, and radiators may need moving. Check the ceiling height too, especially under beams or in older rooms with lower ceilings.
What if you find something unexpected under the floor?
The work should pause while it’s looked at, and you should be shown what’s been found and talked through the options before anything carries on. Any change to the work or the price should be agreed in writing, as we explain in our guide to agreeing changes mid-build.
Does an uneven floor mean there’s a structural problem?
Not always. It can come from old finishes, previous repairs, or how the floor was built. The cause shouldn’t be guessed, though, so tell us about any cracks, movement, or recent changes and we’ll look into it properly.
Get the levels right from the start
If you’re planning to open up two rooms and there’s a step in the way, get in touch with TD Property Renovations and tell us how you’d like to use the space. We’ll look at the floors, the wall, and the route through with you, and explain the options before any work is agreed.