The comparison between managed, serviced, and leased office space is usually framed in per-desk-per-month terms. That framing flips the answer. London managed offices now command roughly 40% more per desk than serviced, but both formats bundle costs that a conventional lease unbundles: rent, business rates, service charge, fit-out, FM, dilapidations. Compare on the wrong basis and you hide where the money actually goes. This article works the true cost of each format for 30, 100, and 250-person teams over 3 and 5 years, and names where each one wins.

The format decision sits inside the wider exercise of cutting office property costs, which maps total occupancy cost across every line a UK tenant pays. The format you pick changes which lines you control directly and which the operator bundles into a single invoice, and whether the cheaper headline figure stays cheaper once every line is included.

The three formats, in finance terms

The market vocabulary is muddled. Operator websites use "flex," "serviced," "coworking," "managed," and "managed solution" interchangeably. Pinning each down comes first.

Leased / conventional office. A direct head lease with the landlord, typically 5–10 years FRI, or 18 months to 3 years on a short-form. The tenant pays rent, business rates, service charge, utilities, FM, and the Cat B fit-out separately. The lease carries 1954 Act security of tenure, rent reviews, alienation rights, and break clauses unless explicitly contracted out.

Serviced office. A licence (legally not a lease) for a private suite inside a building operated by a flex provider. Operators include IWG/Regus, Fora, Workspace, WeWork, Landmark, Argyll, Halkin, Mindspace, LABS, Clockwise, Work.Life, and x+why. Pricing is per desk per month, all-inclusive: rent, rates, service charge, utilities, cleaning, reception, Wi-Fi, basic furniture, and a shared meeting-room allowance. Term: 1 month minimum rolling, up to 24 months fixed for sharper rates.

Managed office. A bespoke whole-floor or whole-building space, designed to the occupier's specification, fitted out by the provider, and operated by the provider on a single all-inclusive monthly fee. Pricing is per sq ft rather than per desk, because density is bespoke. Term: typically 18–36 months. Setup: 4–12 weeks. Major operators include Kitt, Knotel, Areaworks, Fora's managed product, and a growing landlord-led segment under management agreements.

One structural shift inside the managed segment matters for any tenant signing in 2026. By Q3 2025, 53% of UK operator transactions used a management agreement deal structure with the landlord, the highest proportion in five years; 78% of operators now prefer that model for expansion, up from 45% in 2023 (Savills, Spotlight: UK Flexible Offices 2025). Under a management agreement the landlord retains the underlying real estate risk rather than the operator. That changes the operator's incentives and the durability of the rate you sign.

Why this comparison matters in 2026

Four data points anchor the moment. Each one carries a specific number and a specific source.

The flex market is growing fast. The UK flexible office market was valued at USD 3.84bn in 2025 and is projected to reach USD 6.48bn by 2031, a 9.15% CAGR (Mordor Intelligence). Managed has surged within that: London managed supply is up 66% since 2022 and up 895% since 2019, across 750+ buildings and 101 operators. 98% of UK managed supply sits in London (Valve / BeNews via Allwork.Space, March 2026).

The premium for managed is real and widening. London managed averages £828 per desk per month against £590 for serviced, a 40% gap, or roughly £230 per desk more (Rubberdesk Q3 2025, reported via Property Week, February 2026). The premium varies sharply by submarket: 13% in Holborn, 96% in Mayfair, where managed desks averaged £1,787 per month after a 47.4% year-on-year increase on the arrival of ultra-premium stock.

Managed is taking share because of speed. A sub-10,000 sq ft managed office lets in roughly 5 months in London. The equivalent fitted (Cat B) conventional office takes 19 months. A Cat A shell takes 28 months (Valve / BeNews). Constrained Cat A+ supply is pushing mid-sized occupiers who would historically have signed a conventional lease toward managed alternatives. CBRE's Q1 2026 London Flex Market Update names TMT and AI occupiers as the dominant drivers, and its UK Real Estate Market Outlook 2026 attributes 2025's below-average take-up to occupiers renewing or re-gearing rather than signing new leases.

Hybrid working has reset the density question. The BCO's long-standing benchmark of 80% utilisation (1 person per 10m²) no longer matches reality. The post-hybrid empirical average is roughly 66%, or 15m² per person. AWA's Hybrid Working Index 4 finds UK offices now provide 56 desks per 100 employees, down from 79 in 2022. For the full data, see the BCO workstation utilisation benchmark. The density reset matters because it changes the denominator: a conventional building costs the same regardless of attendance, while serviced and managed price closer to actual occupancy.

What each format costs per desk per month

Headline figures for Q3/Q4 2025 into Q1 2026:

*Conventional figure: City Grade A all-in (rent £65–£105/sq ft, rates £44–£73/sq ft at 48p–50.8p multipliers under the 2026 business rates revaluation, service charge £8–£18/sq ft, utilities £4–£8/sq ft, FM £3–£7/sq ft), plus Cat B fit-out amortised over 5 years at £18/sq ft/year, at 100 sq ft per desk legacy density. Sources: Rubberdesk Q3 2025; Flexioffices 2026 pricing guide; LSH Total Office Cost Survey 2025.

Two things the headlines hide.

Serviced and managed bundle six cost lines into one. Rent, rates, service charge, utilities, FM, and reception all sit inside the per-desk fee. Compare serviced at £590 against a conventional rent of £165/sq ft × 100 sq ft / 12 = £1,375 per desk per month, and serviced looks 57% cheaper. It is not. The conventional figure is rent only. Add the other five lines and the gap narrows substantially. Compare the wrong way and the answer is wrong before you start.

Conventional carries two costs flex avoids, and one tax shield flex cannot capture. Cat B fit-out runs £58–£200/sq ft for London mid-spec (Turner & Townsend, 2025; Cushman & Wakefield, 2026). Dilapidations at exit run £15–£35/sq ft, with typical settled costs at £15–£25/sq ft for modern customised offices (London Dilapidations Ltd, 2026). Both lines sit on the conventional side only. Against them, capital allowances on plant and machinery in the fit-out flow to the conventional tenant; under serviced and most managed structures, the operator captures those allowances because the fit-out is theirs. For a tax-paying corporate, the after-tax position changes materially.

The worked comparison: 30, 100, and 250 people over 3 and 5 years

The methodology is set once and applied consistently across all three scenarios. Density: 15m² (150 sq ft) per person, BCO post-hybrid. Location: City of London Grade A throughout. Cat B fit-out: £90/sq ft mid-spec, with a £40/sq ft landlord contribution, leaving £50/sq ft net to the tenant. Dilapidations provision: £20/sq ft. Serviced: £700/desk/month City average. Managed: £980/desk/month City average. Conventional rent: £165/sq ft/year all-in (the mid-point of the Grade A range), before fit-out amortisation. Discount rate: 0% nominal for the headline figures; NPV refinement noted at the end.

Scenario A: 30 people, 3-year horizon

Serviced wins by a wide margin at this size and horizon. The conventional case carries the full fit-out and dilapidations across only three years, which is the structural reason it loses badly here. Extend the conventional case to a 10-year lease and the per-desk economics shift; on a clean 3-year comparison at 30 people, serviced is the right answer.

Scenario B: 100 people, 5-year horizon

Serviced still wins on raw cost. Managed wins on branded customisation at a moderate premium. Conventional improves materially if the lease runs 10 years rather than 5 because fit-out amortises over more years, but on a clean 5-year horizon at 100 people the per-desk gap is wide. The conventional case at this size is driven by control, balance-sheet treatment, and capital allowances, not headline cost.

Scenario C: 250 people, 5-year horizon

The conventional case here assumes 18 months rent-free and a £60/sq ft landlord contribution on a 10-year lease (both standard for a quality letting at this size), and nets capital allowances on the fit-out. After those adjustments the per-desk gap narrows, but conventional remains roughly twice serviced. The premium buys control, branding, balance-sheet treatment, and a tax shield. Whether that is worth 2× per desk depends on how much each of those four lines is worth to the business.

What flips each comparison

Five sensitivities worth modelling before any decision lands:

One methodological point deserves stating directly. The right metric is cost per person all-in, not cost per desk. Hybrid utilisation runs at 56 desks per 100 employees (AWA, Q2 2024). A conventional building charges for the whole floor regardless of attendance; serviced and managed price closer to actual occupancy. The per-desk comparison overstates the conventional disadvantage if you measure desks at hybrid density and understates it if you measure at pre-hybrid density. Standardise on per-person and the answer stops swinging on a density assumption you control.

A second framing matters here. On a per-sq-ft basis, conventional and managed are far closer than the per-desk tables suggest. City Grade A all-in sits at £165/sq ft/year. London managed averages around £153/sq ft/year, with best-in-class managed reaching £220–£270/sq ft. The per-desk comparison looks like a 3–4× gap because the conventional scenarios use real-world post-hybrid density of 150 sq ft per person, while flex operators build their per-desk price on an internal allocation of roughly 60–80 sq ft per desk. Both figures are accurate; they measure different things. When the business genuinely needs 150 sq ft per person — for acoustic zoning, collaboration space, and a physical environment that supports wellbeing — conventional and managed are competing on broadly equivalent per-sq-ft economics. The gap narrows to 10–30% for comparable quality in the same submarket, and the conventional case recovers much of the ground the per-desk headline takes from it.

What the cost tables cannot capture

Six factors sit outside any spreadsheet but should sit inside the decision.

Option value of exit. A serviced licence with 30 days' notice is, in option-pricing terms, a rolling call on the right to terminate. A 36-month managed contract removes that option for 3 years. A 10-year conventional lease with a 5-year break removes it for 5. The 40% premium for managed over serviced is largely the option to walk on short notice. For a PE-backed scale-up, a pre-IPO business, or a market-entry case, that option is worth paying for. Whether it is worth 40% is a business question, not a property one.

Balance sheet treatment. Under IFRS 16 and FRS 102, most leases (and managed contracts beyond 12 months) sit on balance sheet as a right-of-use asset and a lease liability. Rolling monthly serviced contracts stay off. For listed or PE-owned businesses with covenants tied to lease liabilities, format selection has accounting consequences worth modelling alongside cost.

Customisation and brand. A managed office can be fitted to brand, palette, density, and operational requirements: labs, secure rooms, video studios, branded reception. A serviced office cannot. A conventional lease offers full control. For a business where the physical environment is part of the brand promise, the comparison stops being cost-driven, and managed is usually the answer.

Workspace quality and employee wellbeing. The per-desk comparison assumes all three formats deliver equivalent value per desk. They do not. A conventional FRI lease allows the occupier to plan at 150 sq ft per person: genuine collaboration zones, quiet rooms, acoustic partitioning, sit-stand desks, biophilic design, and circulation space that does not feel compressed. Flex operators price on 60–80 sq ft per desk. That density difference is visible and felt daily. For businesses where the physical environment directly influences recruitment, retention, and output quality, the additional 70–90 sq ft per person that conventional density provides is not a cost item in the spreadsheet; it is the working environment. The per-desk comparison treats that space as waste. For occupiers who view workplace quality as a competitive tool, it is the point of the exercise.

Speed of occupation. Serviced: days to two weeks. Managed: 4–12 weeks. Conventional: 3–6 months from heads of terms to occupation. For an acquisition closing, a regulatory deadline, or a new product launch, serviced is the only viable answer. Cost is secondary to time.

Procurement and operational overhead. The bundled fee replaces 10–12 procurement contracts (cleaning, security, FM, utilities, telecoms, basic IT) with a single invoice. For a finance function with thin operational capacity that is real value. For a business with mature in-house FM, the saving is illusory and the bundling premium is just a premium.

Operator credit risk. A conventional landlord rarely interrupts a tenant's occupation when it changes hands or runs into financial difficulty. A flex operator can. WeWork's UK contraction from 55 to 34 locations during its 2023–24 restructuring forced tenants in closed locations to relocate at short notice. Run operator credit checks before signing any managed or serviced contract: parent guarantees, Companies House filings, and the underlying head-lease structure where the operator does not own the building.

Where each format wins

The recommendation is a function of three variables: team size, commitment horizon, and certainty of headcount. Hold those three constant and the right answer falls out.

Serviced wins when:
- Headcount is under 50 and uncertain.
- The horizon is under 24 months, by plan or by inability to commit.
- The team needs to be operational in under four weeks.
- Fit-out capex is structurally unaffordable.
- Location matters more than the brand of the space.
- The team is a tail requirement: project, satellite, regional sales.

Managed wins when:
- Headcount is 30–150 and reasonably predictable for 2–3 years.
- Brand expression is part of the workplace's purpose.
- The horizon is 18–36 months with genuine willingness to commit.
- Fit-out capex is moderately constrained and you would rather pay a premium to avoid it.
- Speed to occupation matters, but design control matters more.
- The alternative is waiting 18 months for fitted conventional product.

Conventional / leased wins when:
- Headcount is above 100 and predictable for 5+ years.
- Capital is available for Cat B fit-out at £58–£200/sq ft.
- Capital allowances are valuable (tax-paying corporate, large fit-out).
- Branding and operational control are required end-to-end.
- Procurement and FM capacity is in-house.
- The business is comfortable with dilapidations exposure at exit.
- Workplace quality is a deliberate business tool: the organisation needs more space per person than an operator will provide, and the physical environment is designed for wellbeing, focus, and retention rather than density optimisation.

Three edge cases sit between the clean categories:

The managed-as-paid-option-on-downsize play. An organisation considering a footprint reduction takes an 18-month managed contract to test the smaller footprint before committing to a 5-year conventional renewal. The managed contract is, in effect, a paid option on the downsize. The alternative, staying in the existing building and reducing space within the current lease, is to re-gear an office lease.

The serviced-overflow play. An organisation on a long conventional lease that has run out of footprint takes incremental headcount into a nearby serviced facility for 12 months while it negotiates an expansion option or a re-gear with the landlord. Serviced is the cheapest form of immediate scale.

The downsize-into-managed play. A tenant with a 50,000 sq ft lease and 30,000 sq ft of actual utilisation negotiates an exit (see lease assignment vs sublet vs surrender) and moves into 18,000 sq ft of managed at hybrid density. Total cost falls, capital exposure falls, optionality rises.

The errors the comparison usually makes

Ten analytical traps appear in almost every CFO-level format comparison. Any model that runs without checking against this list is exposed:

1. Comparing serviced per-desk to conventional rent only. Conventional rent is one of five cost lines.
2. Ignoring fit-out capex on the conventional side. The single largest distortion in any like-for-like model.
3. Ignoring landlord contributions (£30–£60/sq ft on current Grade A lettings) and rent-free periods (typically 12–24 months) when computing net effective rent.
4. Ignoring capital allowances. The tax shield is captured only by the conventional tenant.
5. Ignoring dilapidations provision. £15–£35/sq ft at exit, paid in cash, not a notional charge.
6. Ignoring annual indexation on multi-year flex contracts. RPI or fixed; rarely flat.
7. Comparing different qualities of space. Mayfair managed at £1,787/desk against Stratford serviced at £400/desk is not a like-for-like number.
8. Using maximum desk count as the denominator. Hybrid utilisation runs at 56 desks per 100 employees; the right divisor is realistic occupancy, not nameplate.
9. Forgetting the option value of an empty break clause. Year 5 of a 10-year lease with a 5-year break is, functionally, a 5-year licence with full optionality.
10. Not stress-testing operator credit. A managed contract is only worth its terms if the operator survives them.

How to model this for your own business

Five inputs go into the model before any tab is filled.

1. Realistic headcount over the horizon. Use 4 weeks of measured occupancy data, not gut feel.
2. The longest commitment horizon you can credibly stand behind.
3. The location quality you genuinely need, not the one you aspire to.
4. Density: default 150 sq ft per desk for hybrid, tighter only where the team is on-site 4–5 days.
5. A 1-to-5 confidence rating on each of the above.

Four outputs come out the other side:

• Per-desk per-month all-in cost for each format.
• Per-person per-year all-in cost for each format, the more honest metric.
• Total 5-year horizon cost including capital allowances and dilapidations.
• The option-value premium you are paying for the format you choose.

One recommendation. A tenant-only adviser, paid only on what they save you, can model all three formats on the same spreadsheet. Most commercial tenants have no adviser whose fee depends on that number going down. That is the structural gap any cost-reduction exercise has to close.

Managed is growing at roughly 10% per year by rent per sq ft. The serviced-to-managed premium is widening, not narrowing. Conventional Cat A+ supply is constrained for larger floorplates and likely to remain so through 2027. The right time to model the comparison is before the lease event, while every option is open, not after, when the calendar has imposed the options for you. For the full framework that places this decision inside total occupancy cost, return to the CFO's playbook. For the specific question of staying versus moving, see the real cost of moving office.

Sources

• Property Week — "London flex market splits as managed offices hit 40% price premium, Rubberdesk reports," 27 February 2026: propertyweek.com
• Savills — Spotlight: UK Flexible Offices 2025 (management-agreement share, occupancy, supply growth): savills.co.uk
• CBRE UK — Business Insights: London Flex Market Update Q1 2026: cbre.co.uk
• CBRE UK — UK Real Estate Market Outlook 2026 – Offices: cbre.co.uk
• Turner & Townsend — Global Office Fit-Out Cost Guide 2025, May 2025 (London £4,671/sqm): reports.turnerandtownsend.com
• Cushman & Wakefield — Global Office Fit-Out Cost Guide 2026, April 2026 (London €2,668/m²): cushmanwakefield.com
• London Dilapidations Ltd — How Much Do Office Dilapidations Cost London 2026: londondilaps.com
• BCO — "Calls for new approach to space planning as office use reaches critical shift," November 2024: bco.org.uk
• AWA — Hybrid Working Index 4, November 2024 (56 desks per 100 employees): advanced-workplace.com
• Mordor Intelligence — UK Flexible Office Space Market 2026–2031: mordorintelligence.com
• Tax Adviser — "Landlord contributions to tenants: the commercial aspects of a lease deal": taxadvisermagazine.com