A loft conversion is among the most popular home improvement projects in the UK for easing space pressure on the rest of the home. It’s a great solution for properties in urban areas or where a two-storey extension doesn’t make financial sense.
Room in Roof Loft Conversion
Prices start at around £15,000 for a room in the roof loft conversion, which is the cheapest and most straight forward option.
This will usually involve:
- the reinforcement of the floor
- a couple of skylights
- added insulation
- a staircase to the loft
- electrics, lighting and heating
- fire safety measures to comply with Building Regulations such as fire doors and smoke alarms.
Dormer Loft Conversion
This is as the above, but with the addition of dormer windows. This will increase the usable floorspace and can be used to add head height which gives you more options when it comes to placement of the stairs.
A dormer loft extension will cost upwards of £20,000. However the average dormer loft conversion with a double bedroom and en suite costs about £35,000–£45,000.
Changing the Roof Structure for a Loft Conversion
This option is the most expensive as it requires the complex removal and rebuild of the existing roof. This could be a hip-to-gable loft conversion or a mansard conversion, for example. You will need to hire a designer and secure planning permission.
This type of work is likely to cost upwards of £40,000.
Ready-made room options will cost around £55,000 for the average home. These are fabricated off-site and then craned into position.
Not always. In most cases, loft conversions tend to be considered Permitted Development (PD), but your design will need to adhere to a number of specified parameters.
If you plan on extending beyond the limits and conditions of PD, or your property is listed or located in a conversation area, then you will need to apply for planning permission. You will also need planning permission if you are altering the roof height or shape (which may be the case if you have to raise it for headroom).
Rooflights and dormers can be installed under PD, but they must not sit forward of the roof plane on the principal elevation, nor must they be higher than the highest part of the existing roof.
Always check with your local planning office before you start any work.
Traditional frame type roof structures are often the most suitable type for loft conversions, allowing the space to be opened up relatively easily and inexpensively. The rafters may need to be strengthened or additional supports added (your structural engineer will advise on what is required).
Trussed roofs require greater structural input, normally involving the insertion of steel beams between loadbearing walls for the new floor joists to hang on and the rafter section to be supported on — together with a steel beam at the ridge.