Cost & value / In-house vs professional
A team clean looks free on paper. The maths changes once you count what an in-house wipe-down cannot reach, cannot measure and cannot certify.
The tempting sum
On paper, an in-house deep clean looks free: you already pay the team, so why hire anyone? The sum only works if the in-house clean and the professional one are the same job. They are not - and the gap is where the real cost hides.
Your staff are the right people for daily cleaning and for the open surfaces of a deep clean. The trouble starts at the parts they cannot reach, cannot measure and cannot certify.
What a wipe-down cannot reach
The extract system is the sticking point. Ductwork is frequently hidden above false ceilings, in roof voids, in plant rooms or running vertically up an external wall - and without proper access, thorough cleaning is impossible. Reaching it safely means access panels at sensible intervals, working at height and sometimes confined-space controls, plus the kit to clean and vacuum the full run.
That is not a criticism of your team; it is simply a different job. Cleaning filters and the visible canopy leaves the grease that matters - the film building through the duct to the fan and discharge - exactly where a fire starts.
The part you cannot sign yourself
Even a thorough in-house effort hits a wall at verification. TR19 Grease now sets a minimum competency: the person measuring grease deposits and issuing the post-clean verification report should hold the BESA Grease Hygiene Technician qualification. That report - before and after photos, grease readings, a TR19 certificate - is what your insurer and fire risk assessment want to see.
An in-house clean cannot produce it. And many insurance policies now require TR19-compliant cleaning at the right intervals; without a valid certificate, a fire claim can be challenged or refused. Set the modest labour saving against that, and the maths tips.
Where the line really falls
The sensible split is not in-house versus professional as rivals - it is each doing what it is for. Your team owns the daily and surface cleaning that keeps standards up between visits. The professional job owns the extract system and the certificate, because that is the only version that is actually compliant.
So an in-house clean is necessary day to day but not sufficient on its own: it cannot reach the sealed duct or produce the qualified certificate, which means it never replaces the professional clean - it sits alongside it.
Questions
They can and should keep on top of daily cleaning, and they can deep-clean open surfaces. What they cannot do is safely reach sealed ductwork or issue the qualified verification an insurer wants.
Extract duct is often hidden above ceilings, in roof voids or running up external walls, and needs access panels and the right kit to clean safely. Reaching it is a working-at-height and confined-space job, not a wipe-down.
TR19 Grease sets a minimum competency - the BESA Grease Hygiene Technician qualification - for the person testing grease levels and signing the verification report. An in-house clean cannot produce that sign-off.
It can. Many policies require TR19-compliant cleaning with a valid certificate; without one, a fire claim can be challenged or denied. The saving on labour is small against that exposure.
For daily and surface cleaning, in-house is the right tool. For the extract system and the certificate, the professional job is not a luxury - it is the only version that is compliant, so the comparison is not like for like.
Phoenix Duct Clean · by the numbers
Keep your team on the daily clean; let us do the deep clean the duct and the certificate need. Ask us where the professional line actually falls for your kitchen.