Bedroom extensions in Nottingham
A bedroom extension gives you one more room to sleep in, often with its own en-suite, without moving house. In most homes there are three ways to get it: a two-storey extension with the bedroom on the first floor, a new room built over a garage, or a loft conversion.
This page helps you choose between those routes and covers what makes a bedroom work in practice: room size, a safe way out in a fire, heating and en-suite drainage. We survey the house, compare the options with you, then design and build the one that suits.
- Two-storey, over-garage and loft routes compared
- Room size, escape windows and heating planned from the start
- En-suite drainage checked before the layout is fixed
Three ways to add a bedroom
The best route depends on what else the house needs, how much garden you are willing to use and what the roof and existing structure allow.
A two-storey extension puts the bedroom on the first floor above new ground floor space. It is the right choice when the kitchen or living area is also too small, because one build solves both. Our guide to the double storey rear extension covers boundary distances and how the new room joins the landing, and the double storey extensions overview compares rear, side and combined layouts.
A room over a garage uses a footprint that already exists, so it can suit a detached or semi-detached house with an attached garage at the side. The catch is that garage walls and foundations are rarely built to carry a bedroom above. An engineer has to check them, and strengthening or new foundations are common. A side garage with a room above usually needs a planning application. If you would rather use the garage itself as living space, see garage conversion.
A loft conversion uses no garden and leaves the ground floor alone. It works when there is enough head height under the ridge and room for a new staircase above the existing one. A dormer loft conversion adds the most standing room.
Questions that decide it
- Do you also need more ground floor space?
- How much garden can you give up?
- Is there an attached garage at the side?
- How much height is there in the loft?
- Where could a new staircase or corridor go?
Typical time on site
Around 10 to 16 weeks on site for most bedroom extensions, as an indicative guide, depending on size and whether an en-suite is included. Design and approvals come first.
How the routes compare
A general comparison. Your property needs to be checked, because house type, location and past changes all affect the answer.
| Route | Uses garden? | Planning position | Main thing to check |
|---|---|---|---|
| Two-storey rear extension | Yes | May be permitted development within the 3m depth and 7m rear boundary limits; otherwise an application | Distance to the back boundary and neighbours’ light |
| Two-storey side extension | Side strip only | Always needs a planning application | Gap to the side boundary |
| Room over a garage | No | Usually needs a planning application at the side | Whether the garage walls and foundations can take the load |
| Loft conversion | No | May be permitted development within 40m³ (terraced) or 50m³ (semi-detached and detached) of added roof volume | Head height and stair position |
Two-storey extensions and loft conversions are not permitted development in conservation areas or on other Article 2(3) land, and Article 4 directions, listed status or earlier planning conditions can remove it. Building Regulations approval is needed for every route.
How big should the new bedroom be?
There is no Building Regulations minimum size for a bedroom in your own home, but the room still has to take a bed, storage and space to move around. A useful yardstick is the Nationally Described Space Standard, which many councils apply to new homes: 7.5m² for a single bedroom and 11.5m² for a double. It is not a legal requirement for an extension to an existing house.
Plan the furniture before the walls. A double bed needs clear space on both sides, and wardrobes need depth that is easy to forget on a drawing. If an en-suite goes into the same footprint, it takes floor area from the bedroom, so check both still work.
On a two-storey extension the new room is reached from the existing landing, which sometimes means giving up part of another room for a corridor. In a loft, sloping ceilings reduce the usable floor area, so the space where you can stand matters more than the total.
Space checks at design stage
- Bed position and clearance on each side
- Wardrobe or built-in storage depth
- Door swing and radiator position
- Window position relative to the bed
- En-suite size if one is included
What makes a new bedroom work
Escape windows and smoke alarms
A new first-floor bedroom normally needs an escape window. Under Approved Document B, the openable part should give at least 0.33m² of clear opening, at least 450mm high and 450mm wide, with the bottom of the opening no more than 1100mm above the floor. Mains-powered, interlinked smoke alarms on the escape route are normally required too.
A loft conversion is different, because it adds a floor above the first floor. Rather than relying on windows, it usually needs a protected stair route down to an exit, with fire doors onto the stair. That can affect the existing first floor as well.
Heating, insulation and ventilation
The new room has to meet current insulation standards, which usually makes it warmer than the rest of the house. Adding one or two radiators is often straightforward, but we check that the boiler has capacity for the extra rooms, and for another shower if an en-suite is added. Ventilation is part of Building Regulations too, through trickle vents or similar in the bedroom and an extractor fan in any en-suite.
En-suite drainage
The position of the en-suite is usually decided by the drains. A toilet needs to connect to a soil pipe with enough fall, so the easiest layouts sit near an existing soil stack or where a new one can run down the outside of the extension. Where that is not possible, a macerator pump can help, but it is a fallback rather than a first choice. We check the drain route before fixing the layout.
Planning and Building Regulations
These are separate. Planning permission, or confirmation that the work is permitted development, covers what the extension looks like and its effect on neighbours. Building Regulations approval covers structure, fire safety, insulation, ventilation and drainage, and is needed on every route.
Party walls
On semi-detached and terraced homes, new foundations near the boundary or work to a shared wall may bring in the Party Wall etc. Act 1996, which sets out when neighbours must be given notice.
Bedroom extension costs
Indicative 2026 guide ranges for Nottingham, not a quotation. After a free survey you get a written, itemised quotation.
| Type of bedroom extension | Guide cost |
|---|---|
| Single bedroom over garage | £35,000 to £55,000 |
| Double storey rear with bedroom above | £55,000 to £90,000 |
| Master bedroom with en-suite | £45,000 to £75,000 |
| Two-bedroom double storey addition | £80,000 to £130,000+ |
For a bedroom, the cost moves most with any strengthening needed under a garage, the en-suite fit-out and drain route, heating changes, the amount of rework to the existing landing and the finish you choose. For loft conversion costs, see our loft conversions page.
See the work before you decide
Photos and past customers tell you more than a sales page can.
Browse the project gallery
Completed extensions and loft conversions grouped by type.
How we check reviews
We only publish feedback once it has been matched to a real job.
Ask for a reference
At your survey, ask to speak to a past customer who added a bedroom in a similar way.
Bedroom extensions across the area
Not sure if we cover your street? Call 0115 990 2782 and we will let you know.
Bedroom extension questions
If the bedroom is all you need and the roof has enough head height, a loft conversion often makes sense because it uses no garden. If the kitchen or living area is also too small, a two-storey extension adds space on both floors in one build. A survey shows which is realistic for your house.
Often, but garage walls and foundations are rarely built to carry a room above. A structural engineer checks them first, and strengthening or new foundations are common. A room over a side garage usually needs a planning application, and Building Regulations approval is always required.
It depends on the route. A two-storey rear extension or a loft conversion may fall under permitted development if it meets the national limits and your property has no restrictions. Two-storey side extensions and most rooms over a side garage need an application. Building Regulations approval is needed in every case.
Normally, yes. The window needs a clear openable area of at least 0.33m², at least 450mm high and 450mm wide, with the bottom of the opening no more than 1100mm above the floor. Interlinked smoke alarms are normally needed too. Loft rooms usually rely on a protected stair instead.
Usually, as long as the toilet can connect to a soil pipe with enough fall. Layouts near an existing soil stack, or where a new one can run down the outside wall, are simplest. The en-suite also needs an extractor fan and takes floor area from the bedroom, so we check both rooms still work.
As an indicative 2026 guide, a single bedroom over a garage is around £35,000 to £55,000, a double storey rear extension with a bedroom above around £55,000 to £90,000, and a two-bedroom double storey addition £80,000 to £130,000 or more. You get a written, itemised quotation after a free survey.
Most take around 10 to 16 weeks on site as an indicative guide, depending on size and whether an en-suite is included. Design, any planning application and Building Regulations approval come first, and these stages do not run to fixed dates.
Find the right route to your extra bedroom
A free site survey looks at the garden, the garage, the loft and the drains, so you can compare the realistic options for your house. You then get a written, itemised quotation.