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The average cost to replace a toilet fill valve is around $100, and prices range from $50 up to $150, depending on your location, the experience of the plumber, and how accessible your toilet is. In most cases, a professional plumber can replace your fill valve in under an hour, although it might take longer if they also need to fix or replace other components at the same time.

If you don’t replace a toilet flapper, your toilet tank will continue to empty and fill repeatedly, wasting water and running up your utility bills. Checking the flapper is a good first guess when dealing with a constantly running toilet. However, if these problems continue after replacing the flapper, you may need to hire a plumber to check and fix any bigger problems. 

You can DIY your toilet flapper replacement if you’re up for a small plumbing project. Turn off the water to the toilet, open the tank lid, remove the chain from the lever, and unhook the flapper. For a new, adjustable flapper, adjust it to the right setting according to your toilet's gallons per flush rating. Hook the flapper in place and install the chain with 1/2 inch of slack.

Yes, frozen pipes can prevent a toilet from working correctly. If the pipes are frozen, water cannot flow, which means your toilet tank won't be able to refill after a flush. This will prevent the toilet from flushing again. Depending on which lines are frozen, the ice can also block the drain pipe, preventing water from flushing away.

As a temporary workaround, you can manually add water to the tank for each flush. To clear a frozen drain pipe, you can try filling the toilet bowl or tank with warm water and flushing to help thaw the ice. However, the best long-term solution is to unfreeze the pipes to get your toilet back in working order.