Loft Conversions Wallington, Carshalton & Purley
The features that will decide the suitability of the roof space for a loft conversion are the available head height, the pitch and the type of structure, as well as any obstacles such as water tanks or chimney stacks. An inspection of the roof space will reveal its structure and physical dimensions.
Take a measurement from the bottom of the ridge timber to the top of the ceiling joist; the useable part of the roof should be greater than 2.2m.
The higher the pitch angle, the higher the central head height is likely to be, and if dormers are used or the roof is redesigned, then the floor area can be increased.
Type of Roof Structure
Two main structures are used for roof construction — namely traditional framed type and truss section type. The traditional framed type is typically found in pre-1960s houses where the rafters and ceiling joists, together with supporting timbers, are cut to size on site and assembled. This type of structure has more structural input, so is often the most suitable type for attic conversions. The space can be easily, and relatively inexpensively, opened up by strengthening the rafters and adding supports as specified by a structural engineer.
Post 1960s, the most popular form of construction used factory-made roof trusses. These utilise thinner – and therefore cheaper timbers – but have structural integrity by the addition of braced diagonal timbers. They allow a house roof to be erected and felted in a day. However, this type of truss suggests that there are no loadbearing structures beneath, and so opening up the space requires a greater added structural input.
This will normally involve 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. This added structural input requires skill, knowledge and equipment that would limit scope as far as DIY is concerned — and a far greater cash outlay. It is advisable to seek advice from specialist firms in this instance.
How Much Will my Loft Conversion Cost?
The cost of your loft conversion will depend on your roof structure, the existing available space and whether any alterations need to be made to the floor below to accommodate the staircase.
Room in Roof Loft Conversion in Wallington, Carshalton & Purley
A basic ‘room in roof’ loft conversion is the cheapest and could start at around £15,000. 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