On the cooktop, one of the burners (gas) does not turn on.

Douglas requested 3 quotes from Plumbers in Hornsby

Gas cooktop - front right burner does not turn on. Knob is difficult to turn.
Also in shower - sliding door panels are not connected.

ONSHORE PLUMBING GAS & ROOFING -DNC

Sydney Quality Plumbing

Tree roots cleared
Tree roots cleared from a straight drain pipe outside the house / drive way...

Plumbing cistern replaced and pipe leak repair
Old style plastic cistern needs replacing. It is attached to a "L" pipe from...

Fixing dripping taps
Two sets of dripping taps (heads don't have screws) plus four lines of...