Dental practice compliance
HTM 01-05: what your decontamination room actually needs to comply
HTM 01-05 is the NHS England technical standard for decontaminating reusable dental instruments in primary care. If you're registering a practice with the CQC, or renewing registration, your decontamination room needs to meet it — and the building constraints it brings are worth understanding before you sign a lease, not after.
The core principle: dirty-to-clean, one direction only
Everything in HTM 01-05 exists to enforce one rule: instruments move from dirty to clean and never back the other way. Once an instrument has passed through disinfection, it cannot re-enter the dirty zone. That single rule is what shapes the room layout, the equipment sequence and the physical barrier between zones.
Two-room split, or a single Instrument Processing Area
Where floor area allows it, HTM 01-05 permits a dedicated dirty room and a separate clean room. Where it doesn't, a single Instrument Processing Area (IPA) is acceptable — as long as there's a clear physical barrier between the dirty and clean sides. That barrier can be a wall or a marked worktop divide; what matters is that instruments never travel back through the dirty side once they're through disinfection. Which option makes sense depends entirely on the floor area you actually have.
The equipment sequence
Instruments follow a fixed sequence from surgery to sterile storage:
1. Transport from surgery
Used instruments are moved from the surgery to the decontamination area in a covered tray or rigid container — never carried loose — to protect staff and other surfaces on the way.
2. Ultrasonic bath or washer-disinfector
Instruments go into an ultrasonic bath (or straight into a washer-disinfector) to remove visible debris and biological material before disinfection. This is the 'dirty' side of the room.
3. Washer-disinfector cycle
A validated washer-disinfector cycle disinfects the instruments. This is the point the workflow crosses from dirty to clean — instruments never travel back through the dirty zone once they're through this step.
4. Inspection
Instruments are inspected, typically under magnification, to confirm they're visibly clean and undamaged before sterilisation. Anything that fails inspection goes back through the cycle, not forward.
5. Autoclave (sterilisation)
A validated autoclave sterilises the inspected instruments.
6. Sterile storage
Sterilised instruments are stored on the clean side, away from the dirty zone, ready for the next patient.
Surfaces and drainage
Worktops need to be non-porous, seamless and chemical-resistant — no joins or grout lines for contamination to sit in. Flooring needs to be impervious and coved up the wall, with no 90-degree corners where dirt and moisture can collect; welded-seam vinyl flooring is the standard specification for both the surgery and the decontamination room. Drainage needs to be positioned correctly for the washer-disinfector and sinks, which is exactly the kind of detail a feasibility survey catches before you've committed to a site.
Where CQC fits in
CQC registration falls under Regulation 15 (Premises and Equipment), and it can take 16 or more weeks. Building constraints — drainage runs, floor loading, ceiling height for X-ray lead lining — can rule out a site after you've already committed to it. A technical feasibility survey (drainage, structure, access) before signing a lease or committing fit-out spend is the way to avoid finding that out too late.
How Maycor approaches this
The decontamination room is designed around the correct sink sequence, equipment run and physical barrier between zones from the start — not adjusted after the build begins. X-ray lead lining and the decontamination layout are signed off with your Radiation Protection Adviser and appointed decontamination lead before we build, not after. One team runs strip-out through to finishing, sequenced around HTM 01-05 workflow and CQC premises requirements — surgery fit-out, decontamination room, X-ray room lead lining, dental chair plumbing and electrics, coordinated together rather than handed between separate trades.
Frequently asked questions
What is HTM 01-05 and does my decontamination room need to comply?
HTM 01-05 is the NHS England technical standard for decontaminating reusable dental instruments in primary care practices. It sets out a strict dirty-to-clean workflow, either as two separate rooms or a single Instrument Processing Area (IPA) with a clear physical barrier between dirty and clean zones, plus specific equipment (ultrasonic bath, washer-disinfector, autoclave), sinks, ventilation and surface requirements. If you're registering with the CQC or renewing registration, your decontamination room needs to meet it.
Can I have a single Instrument Processing Area instead of two separate decontamination rooms?
Yes. Where space doesn't allow a two-room split, a single IPA is acceptable under HTM 01-05, as long as there's a clear physical barrier — a wall or a marked worktop divide — between the dirty and clean sides, and instruments never move back through the dirty zone once sterile. We design the layout either way, depending on your floor area.
What flooring and worktops are required in a dental surgery?
Non-porous, seamless, chemical-resistant worktops, and impervious flooring coved up the wall — no 90-degree corners that trap dirt. We fit welded-seam vinyl flooring, the standard specification for dental surgeries and decontamination rooms.
Do I need CQC approval before starting building work on my practice?
You should get a feasibility survey done before signing a lease or committing fit-out spend. CQC registration (Regulation 15, Premises and Equipment) can take 16+ weeks, and building constraints like drainage runs, floor loading or ceiling height for X-ray lead lining can rule out a site after the fact. We carry out a technical feasibility check — drainage, structure, access — before you commit.
Check your site against HTM 01-05 and CQC Regulation 15 before you commit to it.
Book a Feasibility Survey