Safety & Compliance
A flue rarely fails suddenly. It degrades gradually, you adapt to it without noticing, and one day the fire is difficult to light and you cannot say when that started.
These are the signs we see most often, roughly in order of urgency.
Stop using the appliance if you see these
A small number of signs mean the flue is not safely carrying combustion gases away, and continuing to use it risks carbon monoxide exposure or a chimney fire.
- Smoke entering the room during normal operation rather than just at lighting
- A carbon monoxide alarm sounding, at any level, at any time
- Roaring or crackling from inside the stack, which can indicate a flue fire
- Large quantities of debris or tar falling into the grate or firebox
- Birds audible in the chimney, which usually means a nest is present
Book a sweep soon if you notice these
The everyday signs are less dramatic and easy to explain away, which is exactly why they get ignored until autumn.
- The fire is harder to light than it used to be and needs coaxing
- Glass blackens within an evening rather than staying reasonably clear
- A smoky smell in the room when the appliance is not lit
- Visible soot around the appliance door or on the hearth
- It has simply been more than a year, regardless of how it seems to be running
The signs that are really about fuel
Black glass, sluggish burning and heavy deposits often mean wet wood rather than a neglected flue. Sweeping will clear the result, but unless the fuel changes it comes straight back.
We will tell you when that is what we are seeing, because a second sweep in six months is not a business model we want and is not what you need.
Timing it well
The ideal time is late summer, before the first fire of the season. It catches summer nests, clears deposits before they absorb autumn damp, and gets you a date of your choosing rather than a wait in November.
Frequently asked questions
How do I know if I have had a small chimney fire?
Signs include a roaring noise during use, unusually hot brickwork, tar or debris falling afterwards, and cracked or displaced pot or flaunching. If you suspect one, stop using the appliance and have the flue camera surveyed before it is lit again.
Is once a year enough?
For most households burning moderately, yes. Heavy wood use through a full winter usually justifies twice a year, and a hard-worked commercial appliance may need more.
My fire seems fine, do I still need a sweep?
Yes. A flue can be substantially restricted and still appear to work acceptably on a still day. Sweeping is preventative, and it is also what produces the certificate your insurer may want.
Does a gas or oil appliance flue need sweeping?
Those flues still need checking and cleaning. Deposits and blockages, including nests, affect them too, and the consequences of a blocked flue are the same.
What if the chimney has not been used for years?
Do not simply light it. Have it swept and camera surveyed first. Disused flues collect nests and shed mortar, and their condition is unknown until somebody looks.
Book before the season starts
NVQ qualified sweeps, APICS and Guild members, certificate issued every visit. Late summer slots go quickly.