Why should I bother getting Building Regulation Approval?
Because,when a roof space is converted into a room, the work will need to comply with the Building Regulations to ensure it meets certain health and safety standards for Structural Stability,Fire Safety,Fire Resistance of the Structure,Resistance to Moisture,Ventilation,Stairways and Thermal Insulation.
There are a number of reasons why you should get Building Regulation approval when it is required:
Anyone carrying out building work without approval is breaking the law and can therefore be subject to legal action. This can result in a fine of up to £5,000, administered through the Magistrates Courts (from April 2002).
Building work carried out without approval will not have been checked and may therefore be unsafe.
Most loft conversions do not require Planning Permission which is completely separate from Building Regulations,only need planning permission if you're going to altered the size of the orginal roof.
For example,
Velux windows must have a double roof rafter on each side and be accessible at 1.7m maximum distance from the fascia/gutter.(This is so the fireman can get you out from the ladder).If you have staircase in the lounge,you must have Velux Fire Escape window (This is so if the fire start in the lounge,you can get out of the Velux Fire Escape Window with a rope ladder.)
Are the floor joists or RSJ the correct size? Does the staircase have a correct headroom? and so on.
When you come to sell your property,any building work that you have carried out without approval may lead to, the sale being aborted and a reduction in the property value.
If you are purchasing a property, documentary evidence that any previous building work carried out has approval gives you the reassurance that the work was done properly.
If you know the loft conversion is done correctly according to the building regulations then you have no worry and the local council will give you the approval notice and the Certificate of Completion which give the buyer the confirmation that the work has been carried out correctly and in accordance with the Building Regulations.
Will I need to pull work down?
This can sometimes occur if the person does not have sufficient knowledge of the Building Regulation requirements. This will usually only be required as a last resort if no other solution can be found to remedy the situation,so it not as bad as you think !
I can't speak for the legal side but you could board it up and forget it or get a written agreement from the buyer on the understanding that no building approval was made.
But you should seek further advice from Council Control Section,as you say the council can't do anything about if it was done few years ago.I'm not a legal expert on this one,so if the structure of the building starts giving problems,who's responsible ?
We need GwaiLo on this one,failing that, the estate agent might be able to advise you on this as it's happening all the time !