Toilet keeps running in Thornbury? Here's what to do.
A constantly-running toilet wastes 200+ litres of water a day and will eventually push your bill up if you're metered. The fix is one of two parts inside the cistern.
Try this first
Safe steps you can take in the next 10 minutes — in order.
- 1Lift the cistern lid and watch — see whether water is leaking past the flush valve or constantly coming in via the float valve.
- 2Replace the flush valve seal (£8, 20 minutes) if water is bypassing it.
- 3Replace the float valve (£15, 30 minutes) if water is constantly filling.
- 4Descale the flush valve seat with white vinegar and a cloth.
When to stop and call
If you've tried both fixes and the issue continues, the cistern itself may be cracked. Time for a new WC.
Likely causes
Most cases of a toilet that keeps running in Thornbury homes come down to one of these.
- Failed flush valve seal at the bottom of the cistern
- Failed float valve allowing constant fill
- Limescale on the flush valve seat
- Worn dual-flush mechanism (modern toilets)
What it costs to fix in Thornbury
Quick fix
£75
Typical
£130
Worst case
£320
Most repairs are a callout plus parts. Full WC replacement supply-and-fit from around £280.
The service that fixes this
Fast-response emergency plumbing for burst pipes, major leaks, and no hot water — available when you need us most.
See emergency plumber in Thornbury →Quick questions
Can I fix a toilet that keeps running in my Thornbury home myself?
Sometimes yes — the steps above cover the common DIY fixes. If you've tried both fixes and the issue continues, the cistern itself may be cracked. Time for a new WC.
What does fixing a toilet that keeps running typically cost in Thornbury?
Around £130 for the typical repair (range £75–£320). Most repairs are a callout plus parts. Full WC replacement supply-and-fit from around £280.
How quickly can someone come out in Thornbury?
For genuine emergencies in Thornbury we usually attend within 1–3 hours during weekdays. For non-urgent jobs we typically book within 2–5 working days.
Is this an emergency?
Usually no. A toilet that keeps running can normally wait until the next working day, which keeps the cost down. Genuine emergencies are flooding, no water at all, or gas smells.
Toilet keeps running in nearby areas
Need someone out today?
We cover Thornbury and the wider South Gloucestershire area for fast plumbing and bathroom repairs.
Call 07927 593 585From our portfolio in South Gloucestershire
A small sample of South Gloucestershire work. Every job here was managed by the same team that would handle your Thornbury project.
Booking emergency plumber work in Thornbury?
Our diary fills 3–4 weeks ahead in peak season. Get on the list now and we'll confirm a site-visit window inside one working day.
In short
Next step: get a written quote. We travel to Thornbury (and anywhere within 25 miles of Yate) without a callout fee. Bring photos of the room if you have them — it saves a visit.
Local context
Emergency Plumber jobs in Thornbury are scheduled around the realities below — postcode coverage, nearest roads, councils involved, and the named places we travel to from there.
South Gloucestershire Council — covering BS, GL postcode districts.
We reach Thornbury via M4, M5, M48 — and serve sites within roughly 25 miles of here.
- Yate~4 mi
- Chipping Sodbury~6 mi
- Dursley~8 mi
- Bristol~10 mi
Aztec West · Severnside
South Gloucestershire is reached via the M5 J14, typically 35 minutes from our base.