What is an unofficial loft conversion?
An unofficial loft conversion is a conversion that is not up to building regulations and has not been approved by the Building Control Department. Loft conversion turns a typically unused or under-used attic into a more useful space such as an office, study or extra bedroom.
Conversions should be sanctioned by Building Control to confirm structural safety, engineering quality and compliance with the necessary building standards and laws. Unofficial conversions can negatively affect both the safety and the valuation of the property.
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Why might a converted loft not count as a bedroom?
Investigations often find that a loft has been converted into a room in appearance but is not a liveable bedroom. These spaces may be well finished and able to work as a study or office, yet be unsuitable for living in.
- No compartmentation: there are no distinct, separated sections, which can raise fire hazards.
- Sloped ceilings: prominent sloping ceilings make the space less suitable for living in.
- No visible steel beams: where none can be seen, this may indicate a lack of necessary support for this kind of construction.
- No certificate: there is nothing to show that the conversion was inspected and approved.
What should a survey of a loft conversion check?
A survey should look carefully at the roof structure and the visible timbers for deficiencies such as rot and woodworm.
The roof structure of converted lofts is typically pitched, with purlins (horizontal beams supporting the rafters) and rafters. In unofficial conversions it is common to find that struts have been removed.
Even where no timber defects are found in the roof, the condition of the wall plate, the timber on top of the wall that the rafters sit on, can be difficult to assess if it cannot be accessed.
How can an unofficial loft conversion be made compliant?
The first step is Building Control approval; the conversion may then need compartmentation, roof and dormer changes and added structural support.
- Building Control approval: without a completion certificate, the loft should be inspected by the Building Control Department to confirm it meets the required safety standards.
- Add compartmentation: creating distinct sections or rooms within the loft can improve its functionality and might reduce potential fire hazards.
- Change the roof structure and dormer: replacing the hip, the sloping end of the roof, with a new roof and installing a larger dormer, a window projecting beyond the roof slope, can give more natural light and better ventilation, making the loft more comfortable and habitable.
- Provide structural support: the absence of a steel beam raises concerns about structural support and might require a steel beam or alternative support to be added.
All changes must be approved by Building Control, and ideally carried out by an experienced builder or structural engineer. Planning permission may also be required before construction changes are made.
What to look for when viewing a loft conversion
- Whether a completion certificate from Building Control is available.
- Whether steel beams are visible.
- Whether the loft has distinct sections or compartmentation.
- The extent of sloping ceilings and the usable space.
- Whether the room is presented as a bedroom when it may only suit a study or office.
What a survey can — and cannot — tell you
A building survey provides an informed assessment of the visible condition of a property. Inspections are non-intrusive and limited to areas that are accessible at the time of inspection.
For a loft conversion, a survey helps identify signs that the conversion may not be compliant or habitable, and the visible condition of the roof timbers.
- Visible roof timbers, inspected for rot and woodworm, including from the hatch.
- Whether struts appear to have been removed.
- Whether steel beams are visible.
- The absence of compartmentation and the extent of sloping ceilings.
However, there are limitations to what a survey can determine without intrusive investigation.
- The condition of the wall plate where it cannot be accessed.
- Structural support hidden within the obscured parts of the loft.
- Whether the conversion meets building regulations, which requires Building Control inspection.
Where higher-risk indicators are identified, further specialist or intrusive investigation may be recommended.
Frequently asked questions
Can a loft conversion without a certificate be called a bedroom?
Not necessarily. Investigations often find that a converted loft works as a study or office but is not a liveable bedroom, for example because it lacks compartmentation or has prominent sloping ceilings.
What happens if there is no completion certificate?
The loft should be inspected by the Building Control Department to confirm it meets the required safety standards.
Why do missing steel beams matter?
If no steel beams are visible, this may indicate a lack of necessary support, and a steel beam or alternative support might need to be added.
Who should carry out the remedial work?
Ideally an experienced builder or structural engineer, with all changes approved by Building Control.
Do unofficial loft conversions affect value?
They can. Conversions that are not up to building regulations can negatively affect the safety and valuation of a property.
