First off, congratulations on the purchase of your new home!
Bathroom exhausts which are poorly vented into the attic are quite common among older homes. As far as fixing the poor ventilation, an insulation company or roofer will need to be called in, however, we are your attic mold removal specialists! Often times an insulation company will need to come in as well to address any other ventilation issues and check out the insulation. If over 30% of the attic is affected with mold than it is recommended to remove and replace the insulation as well. We work with the best insulation companies across the country and offer up to 25 year warranties on our services combined.
The cost differs from job to job and the starting range is $1500, it can go up from there depending on the amount of mold found, the square footage of the attic, fixing the source of the mold and whether or not the insulation needs to be removed or replaced. It is best to have us come in for a free mold inspection of the attic and provide you with a firm estimate on the remediation.