A deep clean is not the same as your regular cleaning contract, and it isn’t priced the same way either. Whether you’re preparing for an environmental health inspection, resetting a tired workspace, or meeting a landlord’s standards audit, this guide explains what commercial deep cleaning costs in London in 2026, how it’s priced, and what separates a genuine deep clean from an expensive tidy-up.
Quick answer: Crystal’s commercial deep cleaning in London starts from £3.00 per m² (+VAT). It’s priced per square metre because floor area is the main driver, and the final figure is quoted on the actual job against a free site survey — heavily soiled or specialist areas (kitchens, medical, post-incident) take more work and are confirmed after the survey.
Crystal’s deep cleaning rates at a glance
| Service | Starts from | Best for |
|---|---|---|
| Commercial deep cleaning (per m²) | from £3.00 / m² (+VAT) | Offices, retail, larger predictable spaces |
| Specialist / high-risk areas | Quoted per site | Medical, food, post-incident environments |
| Kitchen / extraction deep clean | Quoted per site | TR19-compliant catering environments |
All rates are “from” starting prices, +VAT. Deep cleans are one-off or periodic, not part of your regular contract rate, and the final figure is confirmed after a free site survey.
Why deep cleaning is priced differently to regular cleaning
Your day-to-day contract maintains visible surfaces. A deep clean resets the building to a hygienic baseline — reaching the build-up that routine cleaning never touches: grease in kitchen extraction, limescale in washrooms, soiling in carpets and upholstery, dust on high-level surfaces and ductwork, and the bacterial load on high-touch points.
That means more labour hours per square metre, specialist equipment (steam, rotary machines, high-level access), stronger COSHH-controlled products, and trained, supervised operatives working to method statements and risk assessments. It’s a different job, so it carries a different rate.
What actually drives a deep cleaning price?
- Floor area — the primary driver, which is why per-m² pricing is the fairest basis for most sites.
- Current condition — a lightly used office resets faster than one that’s been neglected for months or had a change of tenant.
- Specialist areas — commercial kitchens, washroom banks, labs and medical suites need higher-spec, compliance-driven cleaning.
- Access and height — high ceilings, ductwork, mezzanines and glass all add time and equipment.
- Compliance and documentation — sites that need RAMS, TR19 kitchen certificates or an audit paper trail carry more admin and supervision.
- Timing — overnight or weekend delivery to avoid disrupting your operation may add an unsociable-hours element.
Crystal’s deep cleaning pricing
We quote against a free site survey rather than a phone estimate, so the price reflects your building’s real condition and requirements. You receive a clear, itemised figure with no hidden fees before any work begins, and we schedule around your hours — overnight, early morning or weekends — so your business keeps running.
When is a deep clean worth it?
A periodic deep clean pays for itself when the cost of not doing it is higher: a failed environmental health or CQC inspection, a landlord dilapidations charge, lost client confidence, or staff sickness from a workspace that only looks clean. Common triggers include seasonal resets, tenant change-overs, post-refurbishment cleans, and preparing for an audit or inspection.
Get a deep cleaning quote based on your actual site
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Frequently asked questions
How much does commercial deep cleaning cost per square metre in London?
Crystal’s commercial deep cleaning starts from £3.00 per m² (+VAT), quoted on the actual job. It’s priced per square metre because floor area is the main driver; kitchens, medical areas or heavily soiled sites take more work and are confirmed after a free site survey.
What’s the difference between a deep clean and regular cleaning?
Regular cleaning maintains visible surfaces day to day. A deep clean is a periodic, intensive reset that reaches build-up routine cleaning never touches — extraction grease, limescale, carpet soiling, high-level dust and high-touch bacterial load — using specialist equipment and stronger, COSHH-controlled products.
Is deep cleaning priced per hour or per square metre?
Larger, predictable spaces are priced per square metre, which is the fairest basis — Crystal’s deep cleaning starts from £3.00 per m² (+VAT). Whatever the site, a good provider will survey it and show you the total before any work begins.
Can a deep clean be done without disrupting our business?
Yes. We schedule deep cleans overnight, early morning or at weekends across London so your operation is never interrupted. Timing is agreed and factored into your quote up front.
How often should a commercial site have a deep clean?
It depends on footfall and sector. Many offices book a deep clean quarterly or twice a year; high-footfall, food or medical environments need them more often, and always ahead of inspections, audits or tenant change-overs.
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