A blocked toilet can overflow quickly. What to do straight away, what not to flush and when to call a drain specialist.
Stop flushing
If the bowl is already high, do not flush again. Turn off the toilet isolation valve if accessible and needed. Keep towels ready for clean water, but treat any wastewater as potentially contaminated.
Local obstruction or bigger problem?
A single blocked toilet may have something caught in its built-in trap. If the shower, bath or downstairs WC also backs up, a branch pipe or underground drain may be obstructed.
Avoid damaging the toilet
Do not pour together chemical drain cleaners and do not use boiling water on a ceramic pan. A suitable toilet plunger may help with a straightforward local blockage, but do not force tools into the pan where they could scratch it or lodge out of reach.
When to get help
Call a suitable drainage specialist if sewage appears in another fixture, the blockage cannot be cleared gently or the problem keeps returning. Describe anything unusual that might have been flushed.
What the repair should establish
Clearing the obstruction is only part of the job if the same toilet blocks repeatedly. The contractor should consider whether the problem lies in the pan, connecting pipe or main drain.
Need a drainage specialist?
You can describe your drainage problem and request quotes from local tradespeople through MyJobQuote. Ask the person you choose to explain the cause, price and scope of any proposed work.