Commercial below flat decreases value by how much?

[philv]

If a flat has a commercial premises below it, how much as a percentage is it worth less than a comparable flat without a commercial below?

In this case the comercial is a hairdressers.

Cheers

[philv]

I though the mere fact that many mortgage providers wont touch it would definately mean a decreased value.

[philv]

As were talking percentages and ive already said it is a hairdressers, where is the guessing?

[philv]

DanL said:

Where is it? Central London, Northern England, small village somewhere?

Historic town centre in east midlands

[philv]

In which case, if it is likely to fall quicker, and half of mortgage companies wont touch it, and ithe shop could possibly be converted to an all night kebab and adult sex shop all in one.

Wouldnt that imply the flat must be worth less than a similar fkat without thise risks/problems?
Wont a valuer see it this way?