The neighbour has a leaf blower and a strong sense of Saturday

This works through neighbourhood noise in the order the parts actually depend on each other.

The rules measure loudness and people experience intrusion

Noise regulations typically specify sound levels at a boundary, measured over a period, because a level is objective and enforceable. Annoyance research consistently finds that intermittency, tonality, unpredictability and perceived controllability matter as much as level. A repetitive intermittent sound well below any legal threshold can be far more disturbing than a steady louder one that comfortably exceeds it.

That gap between what is measured and what is experienced is why so many complaints go nowhere despite being entirely genuine. It is a measurement problem rather than an indifference problem, which does not help at all at seven on a Saturday morning.

Low frequencies go through walls

Building materials attenuate high frequencies effectively and low frequencies poorly, which is why you hear the bass and not the tune. Low-frequency sound also couples into building structures and re-radiates from surfaces inside your home, bypassing the airborne path entirely. That is why moving furniture or closing a window helps less than expected against music, machinery or a heat pump.

It also means the source can be considerably further away than it seems, since low frequencies attenuate less with distance. Structural isolation is the only real fix and it is a building intervention rather than a household one.

Equipment noise has genuine standards

Garden machinery, air conditioning units and heat pumps are subject to noise limits at the point of sale in many jurisdictions. Those limits apply to the equipment rather than to its installation, so a compliant unit mounted on a shared wall can still be a serious problem.

On hold for the fourth time, planning rules in some places set installation conditions for heat pumps and similar equipment, including distance and level at a neighbouring boundary. Checking whether an installation required permission, and whether conditions were attached, is frequently more productive than a noise complaint. This is one of the more effective routes available and almost nobody thinks of it first.

What complaint processes actually want

Local authority noise teams in most systems need a record showing dates, times, duration and the effect on you, kept over a period of weeks. A diary is more useful than a recording, because a phone recording cannot establish level and is easily disputed. Many authorities will install monitoring equipment where a log establishes a pattern, and the log is the threshold for that decision.

Somewhere in the release notes, starting the log at the point of first irritation rather than after three months of it saves the three months.

Approaching the neighbour first is also usually a formal expectation, and it resolves a meaningful share of cases without any process at all.

Talking to a neighbour without a feud

Most noise is genuinely unintentional, since people cannot hear their own sound through their own walls and have no idea what carries. Raising it early, once, specifically and without accumulated resentment is far more effective than raising it after six months of silence. Being specific about the time and the sound rather than the person gives them something they can act on.

Offering a workable alternative, such as a different hour or a different surface, converts a complaint into a negotiation. If it fails, having tried is also the thing every formal process asks about first.

Protecting your own hours

Masking with a broadband sound is effective against intermittent noise, because it raises the floor and removes the startle. Earplugs vary enormously and the fit matters more than the rating, so trying several types is worth the small cost.

Heavy curtains and soft furnishings help against airborne mid and high frequencies and do very little against bass. Secondary glazing is the intervention with the largest effect for the money in most homes, and it is far more effective than replacement double glazing. And if the noise is affecting sleep persistently, treat that as a health issue rather than a tolerance test, because it is one.

The takeaway

Keep the diary from day one, and ask whether the installation needed permission.

The fix is usually trivial, which is the most annoying part.