Buying a victorian property and there is no proof building regs were met when a low sash window was replaced with upvc patio doors in 1986. What lintel would/should have been fitted & how can I tell

You will probably need to open up the wall above the window (remove the plaster or plasterboard) to see if there is a structural member. This can then be assessed for its structural performance. You should find either a RSJ (a steel member of some sort or style) or a prefabricated lintel (which are normally black in colour), It will however require a competant person (structural engineer) to assess what it is, once you have opened it up, then you can calculate if it is fit for purpose. I hope this helps... rjha architects

If it is a Victorian property, it will have solid 9" brick walls. If the opening was not widened, you will find a timber lintel on the inside and a brick arch on the outside, both of which will be perfectly acceptable. If the opening has been widened, there should be either a single precast concrete 150x100 lintel on the inside and probably a galvanised L-shaped steel lintel supporting the bricks outside, or alternatively, a single combined steel lintel supporting the whole thickness of the wall. Only if the opening has been widened would you need to expose the work to check. Rupert Burrows

hi, firstly building regulations would have been required for such work in 1986. secondly, if the original opening had not been increased then their is no need to replace the lintel. unless its causing cracks or damage to the house,just leave it alone. roy