Having an onsite dumpster should be your responsibility if it is something you are going to demand. They aren't cheap. Make suggestions or request a dumpster be included in the bid, but I would never start demanding anything when requesting proposals. They may have their own suggestions. We own a dump trailer and we bring it during demolition to handle the large debris. We have the trailer to avoid having to rent a dumpster on the job. If asked we can share this information, but if you require a dumpster instead we would have to take the time and research getting a dumpster to your house and add in costs we aren't accustomed to adding. That takes time and effort we may just not want to expend to give you a quote. Good contractors are generally very busy.
A punitive approach to what could be unforseen and atypical delays may be a bad idea. I would suggest offering a bonus for the job being completed early rather than a penalty for it being delayed. If material is ordered, we can't make it arrive faster if something delays the shipment. We recently ordered a bathtub requested by a customer. It was promised by our supplier for a Wednesday delivery. Bad weather hit Texas and it just didn't leave the warehouse until the following Monday. It blew up our schedule for the project and it wasn't anyone's fault or mistake. If we have an employee critical to the project get sick or injured, we may not be able to get things done as originally scheduled. Jobs can get off schedule for a lot of reasons outside the contractor's control. Charging them for those things is likely to turn them away.
There are a wide range of costs associated with remodeling a bathroom, including size, the type of materials, its current condition, and the location. Homeonwers spend on average between $15,000 and $25,000 in their bathroom renovation. For example, the average cost of a 100 square foot master bathroom with tile walls and flooring, new fixtures, double vanity, and walk in shower with separate tub is around $20,000.
20% labor price ---out of the question----I'm a Building Contractor, If you are totally remodeling a bathroom, where is the cost for demo of existing???? Demo can easily run an extra 10%- factors: 1) Age of existing---many factors here to adjust price, 2) Accessibility ---Getting materials out of and to the bathroom, and protecting present surroundings of owner. 3) Cost to dispose of debris 4) Where is the Contractor's O & P ???
However, if you plan to add more square footage to your bathroom, that's where the expenses can really add up. Expanding the size of an existing small bathroom increases the total cost of a bathroom renovation project and lengthens the job's timeline. Some expansions may require permits, too, which may cost an additional fee and take time to secure.
I just renovated a 6X12 bathroom. Old cast iron tub removed. Removed and saved existing vanity and vanity top. Removed the toilet and replaced the existing rotten flooring and added on to the existing partially rotten floor joist. Removed the drywall and tile from around the old tub. After the new flooring was in I had to modify the existing plumbing to accommodate the new tub and shower surround. The hot and cold water lines had to be raised to fit the surround because the new tub is taller and the drains had to be installed and moved to fit the new tub. Drywall was finished and painted. New faucets,New tub,Tub Surround, and flooring materials were purchased by the home owner. Labor cost was 4,584.00