What should be decided first in a dental surgery design?

The infrastructure: plant capacity (compressed air and suction), pipework routes, decontamination room layout and X-ray positioning. These are the decisions that are expensive to change after first fix, whereas cabinetry, finishes and furniture can be revisited. Design from the plant room outwards, not from the paint colours inwards.

Does moving an X-ray unit require re-testing?

Relocating or modifying X-ray equipment triggers the critical examination requirement under IRR17, with a report before clinical use resumes. Radiation compliance steps belong in the project plan from the start, and your Radiation Protection Adviser should be involved before the design is fixed.

How big does the compressor need to be for a new surgery?

Cattani, for example, specify that a correctly sized compressor delivers a minimum of 50 litres per minute per chair at 5 bar with surgeries running simultaneously. Size for the practice you are building towards, not the one you have today — adding a surgery later is far cheaper if the plant already supports it.

Can a practice stay open during a surgery refurbishment?

Usually, with sequencing: work is phased so surgeries are taken offline one at a time, noisy or disruptive stages are scheduled around clinical sessions, and shared plant is switched over at planned moments rather than mid-list. It requires the engineering and building work to be coordinated by people who understand both.

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Dental surgery design and refurbishment: what to plan before anyone lifts a tool

Last updated: 19 August 2026 · Written by the Precision Dental Solutions engineering team

Most surgery design conversations start with layouts and finishes. Most surgery design problems start with infrastructure — plant capacity, pipework, and compliance steps discovered after the walls are closed. This guide is about the unglamorous decisions that determine whether a build goes smoothly, in the order they should actually be made.

Design from the plant room outwards

Cabinetry can be re-specified. Finishes can be repainted. What cannot be cheaply changed after first fix is the infrastructure: compressed air and suction pipework, drainage, electrical supply, and the plant that feeds it all. So that is where design should start.

Decision	Why it comes first
Plant capacity	Compressor and suction sized for the surgeries you will have, not just the ones you are building now
Pipework routes	Air, suction and water runs are behind walls and under floors — the definition of expensive to revisit
Plant room location	Needs ventilation, temperature control and access for servicing — and somewhere the noise does not matter
Decontamination flow	Dirty-to-clean workflow is a layout question that cannot be retrofitted with furniture
X-ray positioning	Fixed by radiation protection considerations, not by where looks tidy — involve your RPA at design stage
Chairs & cabinetry	Chosen once the above is settled — the room serves the workflow, not the other way round

Size the plant for the practice you are becoming

The most common infrastructure regret is plant sized for today. As a concrete example of what sizing means: Cattani specify that a correctly specified compressor delivers a minimum of 50 litres per minute per chair at 5 bar with surgeries running simultaneously. A unit that comfortably serves three surgeries does not necessarily serve four.

If there is any realistic prospect of adding a surgery within the life of the plant, the marginal cost of specifying capacity now is small. The cost of replacing an undersized compressor and upsizing pipework later is not. The same logic applies to suction.

Plant rooms also have real environmental requirements — compressors have specified operating temperature ranges and need adequate ventilation, and drying performance falls off in overheated rooms. A cupboard that fits the unit is not necessarily a room that lets it work.

The compliance steps that belong in the project plan

A surgery build or refurbishment touches almost every obligation covered elsewhere in these guides. Sequenced into the plan, they are routine. Discovered afterwards, they are delays.

X-ray equipment moved or installed — triggers the critical examination requirement under IRR17, with a report before clinical use. Your RPA should see the design before it is fixed.
New pressure equipment — a new compressor or autoclave needs bringing onto a Written Scheme of Examination before operation.
New sterilisers and washer-disinfectors — require validation at installation, before first clinical use.
Decontamination room layout — the dirty-to-clean flow is assessed at inspection; it is a design-stage decision.
Amalgam separator — if the suction system is being replaced, the separator specification and paperwork come with it.

The pattern worth noticing: almost every one of these produces a document that must exist before clinical use begins. A build plan that ends with "equipment installed" is a plan that ends two weeks before the surgery can actually open. Sequence the testing, examination and validation into the programme with named owners and dates.

Refurbishing while staying open

Full closures are rarely necessary. What phased refurbishment requires is coordination between the building work and the engineering work:

Surgeries taken offline one at a time, with the running surgeries' air and suction protected throughout.
Shared plant switched over at planned moments — not discovered mid-list when a wall comes down and takes a pipe run with it.
Noisy and dusty stages scheduled around clinical sessions.
Each refurbished surgery recommissioned properly — tested, validated where required, documented — before patients return to it.

This is where having one team responsible for both the equipment and the engineering pays for itself: the interface between "builder's problem" and "engineer's problem" is exactly where projects usually slip.

Refurbish the room or just the equipment?

Not every tired surgery needs a build project. If the workflow is sound and the room works, refurbishing the chair and renewing equipment can transform the space for a fraction of the cost. The build project earns its money when the layout is the problem — when the room fights the way you practise, when decontamination flow cannot be made compliant in the current footprint, or when you are adding capacity.

An honest assessment of which situation you are in is worth having before committing to either.

Planning a build, refurbishment or new surgery? We design, build and equip dental surgeries as well as servicing what goes into them — which means the compliance steps are sequenced into the programme from day one, and the plant is sized by the people who will be maintaining it. Request a site survey and we will look at what you have and what you are trying to do.

Frequently asked

What gets decided first?

Plant capacity, pipework routes, decontamination flow and X-ray positioning. Everything visible comes after.

Does moving an X-ray set trigger re-testing?

Relocation or modification triggers the critical examination requirement, reported before clinical use resumes.

Can we stay open during the work?

Usually, with phased sequencing and coordinated engineering. It needs planning, not luck.

New build or equipment refresh?

If the layout works, refresh the equipment. If the layout is the problem, no amount of new equipment fixes it.

One team for design, build and the equipment inside it

Surgery design and build, equipment supply and installation, and the servicing that follows — from one team, across the UK, with the compliance paperwork sequenced in from the start.

Request a quote or site survey

Related guides

Sources: Cattani UK (compressor output and operating-temperature specifications); IRR17 critical examination requirements as covered in our X-ray guide; HTM 01-05 decontamination layout principles. Confirm project specifics with your RPA and equipment documentation.

New guides on servicing intervals, statutory obligations and the faults that take a surgery offline — sent when we publish something worth your time, not on a schedule.