How often

The UK home replacement schedule

Typical replace intervals for the things UK households forget. Each page has a sourced “why”, signs it is worn out, and a button to save it on When's It Due. The list stays in this browser. Nothing is emailed.

How often should you replace toothbrush heads?
Every 3 months
How often should you replace electric toothbrush heads?
Every 3 months
How often should you replace a BRITA water filter?
About every 4 weeks
How often should you replace a fridge water filter?
About every 6 months
How often should you replace a smoke alarm battery?
Every 12 months, and test when the clocks change
How often should you replace razor blades?
About every 4–8 weeks
How often should you replace a contact lens case?
With each new bottle of solution, about every 1–2 months
How often should you give a cat flea treatment?
Every 4 weeks for most spot-ons
How often should you restock dog food?
When the bag is low — typically every 3–5 weeks
How often should you replace a hoover filter or bag?
Bags when full; washable filters about every 3 months
How often should you replace kitchen sponges?
About every 1–2 weeks, or after they smell
How often should you replace an air-purifier filter?
About every 3 months for many HEPA cartridges
How often should you replace cat litter?
Clump daily; full refresh about every 2–4 weeks
How often should you replace shampoo?
When the bottle is empty — typically 1–3 months
How often should you replace toothpaste?
When the tube is empty — typically 4–8 weeks
How often should you restock dishwasher tablets?
When the tub is low — typically every 4–8 weeks
How often should you restock bin bags?
When the roll is low — typically every 3–6 weeks
How often should you restock AA batteries?
Keep a spare pack; remotes and toys drain them unpredictably
How often should you restock toilet roll?
When the pack is low — typically every 2–4 weeks
How often should you restock laundry detergent?
When the bottle or box is low — typically every 4–8 weeks
How often should you restock coffee pods?
When the box is low — typically every 2–4 weeks
How often should you replace dental floss?
When the spool is empty — typically every 1–3 months
How often should you replace mop pads?
Washable pads when worn; disposable pads when the pack is empty
How often should you replace deodorant?
When the stick or can is empty — typically every 4–8 weeks
How often should you replace a water-filter jug cartridge?
About every 4 weeks