Depending on where you live, the cost will vary ie Londoners get charged higher prices than elsewhere. It is feasible to re-cover any soft furniture but the cost may be prohibitive, unless you are prepared to do it yourself. If you do, and need advice, there are lots of youtube videos dealing with this.
The cost will also vary depending on whether you opt ofr removable loose covers, or for a proper re-upholstery job.
I doubt anyone could give you an actual price without looking at the job.