Ordering Carpet for self fitting - size??

An excellent fitter will work with a tolerance of about 1% but prefer about 3% or six inches maximum. On your measurements I make that an additional six inches for the 17 foot room. This is because your rooms may not be truly square. I would always add about six inches but no more to that length. I bet your carpet is actually 4 metres wide not 13 feet but 13.1 feet.

If it is a new home and you are working from plans they are often wrong. Do check.

Remember that if you specify sizes you accept responsibility for errors.

Simon, former carpet seller, not a fitter.

As little as possible, ensuring there's enough to cut - you can't easily cut a small margin. 3" oversize but:- *make sure that your measurements are accurate*. Don't forget that for doorways, alcoves etc. you will need the maximum dimension. You also need to take into account any pattern, and the direction of the pile (especially for stairs).

In message , snipped-for-privacy@m.m writes

Thanks for that Simon.

I think I'll measure again to double check.

Would it cause problems if i added 12inches to each length?

(The saving over buying from the local carpet shop is massive, so the extra cost of the waste is neither here nor there).

I have to say, that's what I do. Allows for slight mismeasurements, and screwups when I lay it! Once I'm sure it's in the right place I trim it to a workable size before final cutting.

If it's too big it can damage/mark the wallpaper...really.