In some regions, fire brigades offer smoke alarm installation services, however this is normally targeting vulnerable demographics or those at higher risk of fire incidents. Ultimately, availability and eligibility criteria can vary, so it isn’t always a good idea to rely on them alone.
It's advisable to contact your local fire brigade or visit their website for information on whether they provide smoke alarm fitting services; although if you want a fast response with fire alarm maintenance ASAP, you should go through a fire safety company, like Kiasu Fire & Security.