A commercial kitchen is a building services problem before it is a joinery problem. Decorative finishes are the visible part, but the things that determine whether the kitchen is approved and whether it remains workable in service are the exhaust arrangement, the make-up air, the drainage and the gas safety controls. These are the points worth getting right at design stage, because correcting them after the hoods are installed is expensive.
Exhaust hood coverage
The single most common issue in kitchen fit-out is the hood not adequately covering the cooking line. The general requirement is that the exhaust hood should extend beyond the outer edge of the worktop, and this rule is applied to the sides and the back of the cooking equipment as well as the front. In practice, this is where the fit-out drawing and the site installation diverge: a hood sized to the equipment line but not to the surrounding worktop leaves uncovered areas, and the extracted air volume is then calculated on the wrong basis.
Any design should show the hood footprint dimensioned against the worktop, not just against the appliance, and should demonstrate that the two align on site.
Extract volume and make-up air
Extraction rate is a function of the hood geometry, the type of cooking, and the temperature of the discharged air. The point that is frequently overlooked is the other side of the equation: a kitchen that extracts without providing make-up air will not achieve the designed performance, and the resulting negative pressure in the kitchen affects combustion, extractor operation and the behaviour of adjacent premises. Make-up air has to be designed in from the start, which often means a dedicated supply or a transfer grille, and sometimes means ductwork that has to be coordinated with the air-conditioning layout.
Services coordination
Kitchen renovation involves gas, water, drainage, power and extraction, all in a confined footprint, often with the highest electrical demand in the building concentrated in one room. The practical risks are:
- Gas and electrical services routed too close together, or inadequately separated
- Insufficient power for the load, particularly where extraction and refrigeration run together
- Drainage falls that cannot be achieved over the required distance, and which must be resolved before the floor is laid
- Fire-rated separations to the extraction ductwork being compromised by later fit-out work
Each of these is straightforward to design and awkward to retrofit. Coordination drawings covering all services in the same plan, rather than separate drawings per trade, is the cheapest way to catch them.
Gas safety interlocks
For any kitchen using gas, the safety arrangements are not optional. Where a kitchen has individual gas appliances, the requirement for a safety device that shuts off the gas supply in the event of flame failure must be addressed, and for larger installations with a central gas supply the applicable requirements are greater again. The interlock needs to be tested and commissioned, and the test record is part of the handover documentation. This is also where regulatory inspection is most likely to look first.
Materials and hygiene
For food preparation areas, material selection is a hygiene matter, not only a durability one. Stainless steel grade matters — 304 stainless is the standard for food preparation surfaces and equipment, with 316 used where chloride exposure is a concern. Beyond grade, the detailing is what determines performance: seamless welding and folded edges rather than open joints, no crevices at the junction of worktop and upstand, and coving at floor-to-wall junctions so that the floor can be cleaned properly. Choosing a lower-grade or poorly detailed alternative saves a modest amount initially and costs in cleaning difficulty and replacement later.
Planned maintenance access
The last point is the one most often left out. Filters, grease traps, and the equipment that must be accessed for cleaning all need space to be removed and serviced, and this space has to be reserved in the layout rather than found afterwards. Access routes that are adequate on the drawing are frequently blocked by a later equipment change, and the result is a kitchen that cannot be maintained to standard — which shows up as a problem at the next licence renewal or inspection.
Working with the right contractor
Because this work touches gas, fire separations and building services, it needs a contractor whose registration covers the relevant scope and who can produce the supporting documents — including the gas safety commissioning records and the fire-rated construction details — when the authority inspects. Prof Team Engineering is registered with the Macau DSSCU for the execution of works (Registration No. 7003/2024, Certificate No. 1648/DIP/2025) and delivers kitchen construction, MEP, ventilation and environmental works as part of an integrated package, so the kitchen is engineered as a system rather than assembled from separate trades.