What Does a Commercial Deep Clean Include?

Most workplaces have a regular cleaning routine — bins emptied, floors vacuumed, desks wiped, washrooms restocked. It keeps the office looking presentable day to day. But regular cleaning, however consistent, only ever addresses the surface. Behind appliances, inside vents, along grout lines, and in the corners nobody thinks to check, dirt, grease, and bacteria build up steadily over weeks and months, invisible until someone finally looks closely.

A commercial deep clean is an intensive, top-to-bottom sanitization process that targets hidden dirt, stubborn grime, and built-up bacteria in areas regular cleaning routines miss. It’s not a bigger version of your everyday clean — it’s a fundamentally different kind of service, using different techniques, equipment, and time allowances to reach the parts of a workplace that standard cleaning simply isn’t designed to touch.

If you’re considering booking one, it helps to know exactly what’s involved before you get a quote. This guide breaks down what a typical commercial deep clean covers, room by room, so you know what to expect and can judge whether a provider’s checklist actually measures up.

Why a Deep Clean Is Different from Regular Cleaning

Regular office cleaning is maintenance. It’s designed to keep a workplace looking tidy and hygienic between deep cleans, usually on a daily or weekly schedule. Deep cleaning is restorative — it’s designed to reset a space that’s accumulated grime over time, regardless of how well the regular routine has been followed.

A few things set deep cleaning apart:

• Scope. Deep cleans reach areas that aren’t part of a standard checklist at all — inside appliances, behind furniture, up in ceiling fixtures, down in grout lines.
• Equipment. Deep cleans often use specialist tools: steam cleaners, pressure washers, carpet extraction machines, and industrial-grade degreasers that go beyond what’s used in daily cleaning.
• Time. A deep clean takes significantly longer per square foot than a standard visit, because it involves dismantling, scrubbing, and treating areas that aren’t touched day to day.
• Frequency. Most businesses schedule deep cleans quarterly, biannually, or annually — not as a replacement for regular cleaning, but as a periodic reset that regular cleaning can’t achieve on its own.

With that distinction in mind, here’s what’s actually included in a typical commercial deep clean.

Kitchens and Breakrooms

Office kitchens and breakrooms are one of the highest-priority areas in any deep clean, simply because they combine food, moisture, and shared equipment — a combination that builds up grime and bacteria faster than almost anywhere else in a workplace.

Appliance Interiors

Daily cleaning rarely goes further than wiping down the outside of a microwave or fridge. A deep clean goes inside:

• Microwaves are cleaned thoroughly inside, removing baked-on food splatters that accumulate over weeks of shared use
• Refrigerators are emptied, wiped down on every shelf and drawer, and checked for expired items and spills that have gone unnoticed
• Coffee makers are descaled and their internal components cleaned, since these machines are notorious for harbouring mould and bacteria in water reservoirs that aren’t visible from the outside

Dishwashers are cleaned inside — filters, seals, and spray arms — areas that build up food residue and limescale over time

Degreasing

Grease is one of the toughest substances to remove once it’s built up, and it accumulates fast in any kitchen with regular use:

• Stovetops and hobs are degreased to remove baked-on residue that daily wiping doesn’t fully lift
• Exhaust hoods and extractor fans are cleaned of trapped grease, which is both a hygiene issue and, if left unaddressed for long enough, a fire risk
• Sinks and backsplashes are scrubbed to remove grease splatter and mineral buildup around taps and drains

Cabinet Detailing

Cabinets and drawers are emptied out and wiped down both inside and outside — a task that’s almost never part of a regular cleaning routine, since it requires removing contents rather than working around them. Over time, crumbs, spills, and dust settle inside cabinets even when the exterior looks clean, so this step is a genuine reset rather than a cosmetic pass.

Restrooms and Washrooms

Washrooms are cleaned daily in most offices, but a deep clean addresses the buildup that daily cleaning, by design, doesn’t have time to tackle.

Descaling

Hard water is a persistent problem in commercial washrooms, particularly in London where mineral content varies by area:

• Mineral deposits and limescale are removed from faucets, taps, and shower heads where applicable
• Hard water stains around sinks and basins are treated with descaling agents that regular cleaning products aren’t strong enough to shift
• Rust spots on fixtures are addressed before they spread or cause permanent staining

Deep Sanitization

This is where deep cleaning diverges most clearly from a standard wipe-down:

• Floors are steam-cleaned or pressure-washed, lifting grime that mopping alone can’t remove
• Wall tiles and grout lines are treated specifically, since grout is porous and traps mould and bacteria that surface cleaning never reaches
• Partitions between stalls are disinfected thoroughly, including edges and hinges where moisture tends to collect

Fixture Scrubbing

Toilets, urinals, and sinks are scrubbed meticulously, including the hard-to-reach crevices around bases, hinges, and seals that daily cleaning typically skips in the interest of time. This level of detail is one of the clearest differences between a routine wipe-down and an actual deep clean.

Floors and Carpets

Flooring absorbs more daily wear than almost any other surface in a workplace, and it shows the difference between regular maintenance and a genuine deep clean more visibly than most other areas.

Advanced Floor Care

• Hard floors are machine-scrubbed rather than simply mopped, lifting ground-in dirt that standard mopping leaves behind
• Old wax coatings are stripped where applicable, removing built-up layers that dull the floor’s appearance over time
• A new protective coat is applied afterward, both restoring shine and making the floor easier to maintain until the next deep clean

Carpet Restoration

• Hot-water extraction (sometimes called steam cleaning) is used to pull embedded dirt, allergens, and dust mites out of carpet fibres — something vacuuming alone can’t achieve, since vacuuming only removes what’s sitting on the surface
• Deep shampooing treats stubborn or long-standing stains that regular spot-cleaning hasn’t resolved
• This process also significantly improves indoor air quality, since carpets act as a reservoir for dust and allergens that get stirred up by everyday foot traffic

For offices that get heavy footfall, this step alone often makes the most visible and immediate difference of the entire deep clean.

High-Level and Detail Dusting

Dust settles everywhere over time, but it accumulates fastest in places nobody looks — up high, in corners, and along edges that regular cleaning routines rarely reach.

Elevated Surfaces

• High ledges, shelving tops, and crown moldings are dusted and wiped, areas that build up a visible layer of dust within weeks of being missed
• Ceiling fans are cleaned on both sides of each blade, since dust buildup here often goes unnoticed until it’s dislodged and falls onto surfaces below
• Light fixtures are cleaned both for hygiene and because dust buildup gradually dims the amount of light a fixture puts out

HVAC and Vents

• Air vent covers are removed, washed, and sanitized rather than just wiped externally
• Accessible duct areas are cleaned to reduce the dust and allergens being circulated through the office’s air supply
• This step has a direct impact on indoor air quality, which matters for staff comfort and, in some cases, for compliance with workplace ventilation standards

Vertical Surfaces

• Walls are washed to remove scuff marks, fingerprints, and accumulated grime, particularly near light switches, door frames, and high-traffic corridors
• Baseboards and skirting boards are wiped down, an area that collects dust constantly but is rarely part of a daily or even weekly routine
• Window tracks are cleaned of the dirt, dead insects, and debris that build up in the grooves over time — a small detail that makes a noticeable difference to how clean a space actually feels

High-Touch Disinfection

Deep cleaning isn’t only about visible grime — it’s also about reducing the bacterial load on surfaces that get touched constantly throughout the working day.

Shared Hardware

Door handles, light switches, elevator buttons, and handrails are disinfected thoroughly. These surfaces are touched by nearly everyone in a building multiple times a day, and research on workplace hygiene consistently identifies high-touch surfaces as a major factor in how illness spreads through shared spaces. The UK’s Health and Safety Executiveincludes cleanliness of shared surfaces as part of its general workplace welfare guidance for exactly this reason.

Electronics

Shared office equipment — keyboards, phones, touchscreens, photocopier control panels — is sanitized as part of a thorough deep clean. These items are often overlooked in daily cleaning because of the risk of damage from over-application of liquid cleaners, so a deep clean typically uses electronics-safe disinfectants applied correctly to avoid damaging sensitive components.

How Often Should You Book a Commercial Deep Clean?

There’s no single answer that fits every business, but a few general guidelines apply:

• Quarterly, for high-traffic offices, client-facing businesses, or workplaces with shared kitchens used by a large team
• Biannually, for smaller offices with lower footfall and less shared equipment

Annually, as a minimum baseline for almost any commercial space, even one with a strong daily and weekly cleaning routine in place

Some businesses also schedule a deep clean around specific triggers — moving into a new space, after a period of heavy use (renovation work, an office move, a busy event season), or ahead of an important client visit or inspection.

If you’re not sure how your regular cleaning routine should complement a periodic deep clean, our office cleaning checklist for small London businesses breaks down what belongs in daily, weekly, and monthly routines, so you can see clearly where deep cleaning fits into the bigger picture.

Preparing for a Deep Clean

Because deep cleaning is more involved than a standard visit, a bit of preparation on your end helps the team work efficiently and reach everywhere they need to. Much of this overlaps with preparing for any professional cleaning session — clearing desks, securing confidential items, and flagging anything sensitive or fragile in advance. If you haven’t already, our guide on how to prepare an office for professional cleaning walks through exactly what to do before a cleaning team arrives, and it applies just as much to a deep clean as to a routine visit.

A few additional things worth doing specifically before a deep clean:

• Clear out cabinets and drawers that will be cleaned inside and out, since staff belongings shouldn’t be handled by the cleaning team
• Let the provider know about any areas needing extra attention — a kitchen that hasn’t been deep cleaned in over a year, a washroom with persistent limescale, or carpets with long-standing stains
• Flag any electronics or equipment that shouldn’t be disinfected with standard products, particularly specialist machinery or sensitive IT infrastructure

Getting a Tailored Deep-Cleaning Checklist

Every workplace is different, and the right deep-cleaning checklist depends heavily on the type of business and the size of the space involved. A small clinic with strict hygiene requirements needs a different approach than a retail unit with heavy footfall, and a 500-square-foot office needs a very different timeframe than a multi-floor workspace.

If you’d like a more tailored recommendation, it helps to know:

• What type of business or facility you have — office, clinic, retail, hospitality, or something else — since different environments carry different hygiene priorities
• How large the space is — square footage, number of rooms, and whether there are specialist areas like kitchens, labs, or washrooms that need extra attention

With those two details, it’s straightforward to put together an estimated deep-cleaning checklist and a realistic timeframe for your specific space, rather than relying on a generic one-size-fits-all quote.

Frequently Asked Questions

What is included in a professional deep clean?

A professional deep clean covers the areas that regular cleaning routines don’t reach in the course of day-to-day maintenance. This typically includes the interiors of kitchen appliances, degreasing of stovetops and extractor hoods, descaling of washroom fixtures, steam-cleaning or pressure-washing of restroom floors and tiles, carpet extraction to remove embedded dirt and allergens, high-level dusting of ceiling fans and light fixtures, cleaning of HVAC vents and ducts, and thorough disinfection of high-touch surfaces like door handles, light switches, and shared electronics. The exact scope varies between providers, so it’s worth confirming which of these are included before booking.

What’s included in a commercial clean?

“Commercial clean” is a broader term that can refer to either regular maintenance cleaning or a one-off deep clean, depending on context. Regular commercial cleaning typically covers daily and weekly tasks — emptying bins, wiping surfaces, vacuuming, mopping, and restocking washroom supplies. A commercial deep clean, by contrast, is a more intensive service covering everything from appliance interiors and grout lines to carpet extraction and HVAC vent cleaning. When requesting a quote, it’s worth clarifying which type of service you’re being quoted for, since the scope and pricing differ significantly.

How much should I expect to pay for a deep clean?

Deep cleaning costs vary based on the size of the space, the type of business, and how much detail work is required — for example, whether carpets need extraction, how many appliances need interior cleaning, and how extensive the HVAC and vent cleaning needs to be. As a general guide for small to mid-sized commercial spaces in London, deep cleans often range from a few hundred pounds for a smaller office to over a thousand pounds for larger spaces with extensive kitchen, washroom, and carpet work included. The most reliable way to get an accurate figure is to share your business type and square footage with a provider directly, since generic per-square-foot estimates rarely account for the specific areas that need the most attention.

What does deep cleaning actually include?

In practical terms, deep cleaning means going beyond visible surfaces to address buildup that accumulates over weeks or months — inside appliances, behind furniture, in grout lines, up in ceiling fixtures, and within HVAC systems. It combines specialist techniques like steam cleaning, pressure washing, and carpet extraction with detailed manual work like scrubbing fixture crevices and wiping down the interiors of cabinets and drawers. The goal isn’t just visible tidiness, but a genuine reduction in the dirt, grease, and bacteria that accumulate in a workplace over time, in areas that standard cleaning routines are never designed to reach.

Final Thoughts

A commercial deep clean isn’t a bigger version of your regular cleaning routine — it’s a different kind of service altogether, designed to reach the buildup that daily and weekly cleaning simply can’t address. From degreasing kitchen exhaust hoods to steam-cleaning restroom grout, extracting embedded dirt from carpets, and disinfecting every high-touch surface in the building, a proper deep clean resets a workspace in a way that maintenance cleaning alone never fully achieves.

Scheduling one periodically — quarterly, biannually, or at minimum annually — keeps your workplace genuinely clean rather than just tidy on the surface, and it protects both the condition of your space and the health of everyone using it.

If you’d like help figuring out exactly what a deep clean should include for your business, get in touch with details on your business type and the size of your space, and a tailored checklist and timeframe can be put together specifically for you.