Core-and-shell delivery gives you the building’s structure, envelope, central plant, risers, lifts, incoming utilities and shared areas, while the leased or occupied suite remains partly or wholly unfinished. The tenant then designs and funds its own interior fit-out. Turnkey delivery is intended to hand over a finished space ready for its agreed use, but the words “ready” and “turnkey” have no fixed universal scope: furniture, equipment, external works and operating approvals are included only when the contract says so.
The handover specification, drawings, responsibility matrix and lease—not the label—decide who builds what, who pays, when access starts and what counts as completion. Treat the terms as starting points for a detailed scope comparison.
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What “core-and-shell” means
Core-and-shell (also written shell-and-core) describes the base-building stage. The developer or landlord normally completes the structural frame, foundations, exterior envelope, roof, common areas and the building systems that serve multiple occupants. Typical core services include risers, plant rooms, lifts, incoming electrical and water supplies, fire-life-safety infrastructure and main heating, ventilation and air-conditioning equipment.
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LexisNexis UK describes shell-and-core as a descriptive commercial term rather than a scope defined by legislation or case law. That qualification matters: two projects using the same label can deliver different levels of mechanical, electrical, plumbing, fire-protection and finish work. The signed specification is the controlling document.
What the landlord or developer usually provides
- Structural frame, foundations, slabs and roof.
- External walls, windows, doors and weatherproofing.
- Shared lobbies, circulation, stairs, lifts and common toilets where specified.
- Main electrical intake, substations, generators or plant included in the base design.
- Central HVAC plant, vertical distribution and risers.
- Main water, drainage, fire-protection and life-safety infrastructure.
- Utility connections and agreed capacity at the tenant boundary.
- Base-building permits, inspections and completion documents assigned to the landlord by the contract.
These are tendencies, not automatic inclusions. A shell may be weather-tight but lack internal fire partitions; another may include a completed core and services distributed across the floor plate. Ask for a room-by-room and system-by-system schedule.
What the tenant usually adds
- Internal partitions, doors and room layouts.
- Floor finishes, ceilings, decorative lighting and feature walls.
- Power and data distribution from the landlord’s connection points.
- Supplemental HVAC, controls and specialist ventilation.
- Tenant plumbing, kitchens, washrooms or process services beyond the base provision.
- Joinery, reception desks, signage, branding and security devices.
- Furniture, equipment and technology.
- Fit-out design, trade procurement, permits and inspections allocated to the tenant.
A tenant can gain significant design freedom, but it also takes on coordination with the base-building systems, building rules and approval timetable. A fit-out cannot overload the landlord’s electrical capacity, compromise fire compartments or interfere with shared plant.
What “turnkey construction” means
Turnkey delivery is an outcome and contracting approach: the contractor or developer is expected to deliver a complete, usable space so the owner or tenant can take possession and begin the agreed operation with minimal additional construction. Commercial real-estate glossaries commonly describe it as fully finished and move-in-ready.
“Ready” still needs a measurable definition. A turnkey office may include partitions, finishes, lighting, power, HVAC balancing and commissioning but exclude desks, computers and a tenant’s specialist equipment. A retail unit may be finished internally yet await a landlord’s external works or a trading licence. A laboratory may be physically complete but not operational until validation and regulatory approvals are obtained.
Typical turnkey inclusions
- Complete architectural finishes and room layouts shown in the approved design.
- Fully installed and tested electrical, mechanical, plumbing, fire and life-safety systems.
- Lighting controls, HVAC balancing and building-management-system points included in the specification.
- Doors, hardware, fixed joinery, sanitaryware and other fixtures listed in the schedule.
- Commissioning records, operation and maintenance manuals, warranties and training where required.
- Occupancy or completion certificates that the contract assigns to the delivering party.
Common turnkey exclusions
- Loose furniture, computers, production machinery and tenant-owned equipment.
- Specialist installations that were not shown on the tender drawings.
- External landscaping, utility upgrades or off-site works outside the defined boundary.
- Business licences, trade permits and approvals that only the operator can obtain.
- Changes requested after design freeze, which are normally treated as variations.
A turnkey price is therefore not a guarantee that the tenant can open on the same day as handover. The agreement must state which approvals, tests, utility accounts and operational prerequisites are part of completion.
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Where Category A delivery fits
Category A office delivery is an intermediate handover often used between a raw shell and a fully tenant-specific interior. A Saudi Arabia-focused fit-out guide published on May 8, 2026 describes a typical Category A office with a suspended ceiling, raised floor, basic lighting and services distributed to the floor plate. The incoming tenant then adds partitions, data cabling, joinery, branding and other workplace-specific elements.
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That description is a market example, not a universal Category A standard. In another project, the ceiling, lighting level or air-conditioning distribution may differ. The lease and landlord’s Category A specification should state the exact tile, luminaire, floor-loading, power, cooling and fire-protection performance.
Core-and-shell versus turnkey: the practical differences
| Issue | Core-and-shell tendency | Turnkey tendency |
|---|---|---|
| Landlord or developer scope | Base structure, envelope, core services and shared spaces; the documents define the boundary. | A more complete finished space, measured against an agreed design and specification. |
| Tenant construction scope | Tenant commonly designs, funds, permits, coordinates and builds interior improvements. | Less tenant construction coordination when the package is complete; exclusions and tenant changes remain. |
| Design control | Tenant has broad control over layout, finishes and specialist systems, subject to base-building limits. | Choices are largely set by the approved turnkey design; alterations can add cost and time. |
| Handover sequence | Base-build completion, tenant access and fit-out completion can be separate milestones. | A consolidated handover is intended, but readiness depends on included work, testing and approvals. |
| Cost exposure | Lower initial delivery scope can leave substantial design and construction cost with the tenant; no universal saving is established. | More work is included in the agreed package; exclusions, provisional items and variations still affect the final cost. |
| Coordination risk | Interfaces between landlord systems and tenant works must be actively managed. | The delivery party carries more integration responsibility, but the contract must identify what remains outside its control. |
What owners and landlords need to decide
Choose the level of standardisation
Core-and-shell is suited to buildings intended for several different occupiers or uses. The landlord invests in a durable base and allows each tenant to create its own interior. A turnkey package is more appropriate when the owner knows the operational brief, wants a single point of delivery or needs a repeatable space delivered to a fixed standard.
Set the technical boundary
Mark the tenant line on coordinated architectural, mechanical, electrical, plumbing, fire and data drawings. State whether the boundary is the riser, a floor distribution board, a capped pipe, a valve, a cable tray or an installed outlet. Include available electrical load, cooling capacity, water pressure, drainage points, fire alarm interfaces and structural loading.
Allocate design and approval duties
Name the party responsible for concept design, detailed design, building-control submissions, utility applications, fire authority reviews, environmental approvals and certificates of occupancy. A filed lease exhibit provides a concrete example in which the landlord was responsible for shell-and-core design, permitting, installation, construction and certificates of occupancy, while tenant improvements followed a separately coordinated schedule. That allocation applied to one project; it is not a standard rule.
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Protect the programme
Link base-build completion, tenant access, fit-out approvals, testing, practical completion, rent commencement and opening dates. Define what happens if a riser, lift, utility or common area is late and whether the tenant receives early access before formal handover.
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Control changes
Use a written change procedure with design deadlines, pricing rules, approval authority and schedule impact. A seemingly small request—such as extra cooling, a heavier server room floor or a relocated sprinkler—can affect plant capacity, structural design, permits and other tenants.
What tenants need to verify before committing
Inspect the unfinished condition
Request current shell drawings, reflected ceiling plans, riser diagrams, equipment schedules and a photographic record. Confirm floor-to-floor and clear ceiling heights, slab flatness, waterproofing, loading, access routes and the condition of the envelope. Do not assume that a “finished core” includes finished tenant toilets or a usable data pathway.
Calculate the fit-out workload
List every tenant requirement and mark it as landlord work, tenant work, shared work or an optional upgrade. Include partitions, acoustic treatment, lighting, power, data, security, kitchens, specialist ventilation, signage, furniture and equipment. Price design fees, permits, temporary works, testing, commissioning, professional inspections and waste removal—not only visible finishes.
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A capped electrical or HVAC connection is useful only if it has adequate capacity. Obtain the available kilowatts, cooling load, outside-air rate, water flow, drainage capacity, fire-system zoning and generator or emergency-power limits. Ask who pays for reinforcement if the tenant’s demand exceeds the base design.
Check approvals and operating constraints
Review landlord design guides, working-hour rules, delivery routes, noisy-work restrictions, fire-stopping requirements and permit lead times. Identify whether the tenant or landlord submits fit-out drawings and who attends inspections. A space can be physically complete yet unavailable for occupation if an assigned certificate or inspection is missing.
Secure access and possession rights
Define the date when the tenant may survey, install works, store materials and bring in furniture. Separate early access from legal possession and rent commencement. Require a process for recording defects and correcting them without blocking the fit-out.
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How to compare the two models in a tender or lease
- Create a scope matrix. Put every room, system and external interface in one schedule. For each item, identify design responsibility, installation responsibility, payer, approval owner, testing requirement and handover document.
- Attach measurable specifications. Replace “finished office” with quantities and performance: floor and ceiling types, lighting levels, socket counts, air volumes, temperature ranges, acoustic criteria, fire ratings and equipment capacities.
- Define the handover line. Mark what is complete, what is capped, what is temporarily protected and what the tenant must connect. Include builder’s-work openings, sleeves, fire-stopping and access panels.
- Coordinate drawings. Require federated architectural, structural, mechanical, electrical, plumbing, fire and data drawings at agreed design stages. Record clashes and interface decisions in a responsibility log.
- Set milestone tests. Identify factory tests, pressure tests, insulation resistance tests, air and water balancing, fire-alarm cause-and-effect tests, lift certification and integrated systems testing as applicable to the project.
- Agree practical completion criteria. State the documents, certificates, demonstrations, cleaning standard, spare parts, keys, training and defect list needed before handover.
- Price variations transparently. Define labour rates, overhead, design fees, contractor mark-ups and time-related costs. Require prompt notice when a change affects capacity or completion.
- Plan defects and warranties. Set response times, access arrangements, warranty start dates and responsibility where a tenant alteration affects a base-building system.
Handover documents that prevent disputes
Whether the project is shell-and-core or turnkey, the handover package should match the physical condition. A useful package can include:
- As-built architectural and services drawings, including tenant connection points.
- Asset registers with model, serial number, capacity and maintenance interval.
- Commissioning and balancing reports, test certificates and statutory inspection records.
- Fire strategy information, cause-and-effect matrices and approved compartmentation details.
- Operation and maintenance manuals, warranties, spare parts and training records.
- Occupancy, completion or authority certificates assigned to the delivering party.
- Open-item and defect schedules with owners and target dates.
- Photographs of concealed services before ceilings and finishes close.
For a turnkey handover, these records demonstrate that the finished space performs as specified. For a shell-and-core handover, they give the tenant’s fit-out team the information needed to connect safely without damaging the base building.
Cost, schedule and risk: what the labels do not tell you
Cost
Core-and-shell can reduce the landlord’s initial construction scope, but it transfers design, procurement and construction cost to the tenant. The tenant may also pay for project management, professional fees, permits, temporary services and reinstatement at lease end. Turnkey includes more work in the contracted package, yet a low headline price can conceal exclusions, provisional sums or a short list of finishes. No universal price advantage exists without comparable specifications, areas, locations, labour markets and dates.
Schedule
Shell-and-core creates two linked programmes: base-build completion and tenant fit-out. Delays to utilities, lifts, risers or approvals can prevent the fit-out from starting even when the tenant’s contractor is ready. Turnkey consolidates more activities under one delivery plan, but long-lead equipment, design changes and authority approvals can still move the handover date. Tie rent, access and opening obligations to objective milestones rather than a label.
Risk
In shell-and-core, interface risk is the central issue. The tenant must know whether a failed connection, inadequate capacity or inaccessible riser is a landlord defect or a tenant design problem. In turnkey, the delivering party carries broader integration risk, but the owner must prevent scope drift by freezing the brief and documenting assumptions. In either model, unclear boundaries produce claims more often than the choice of label itself.
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The WELL Building Standard uses “Core and Shell” as a project type focused on elements controlled by the building owner, including structure, window locations and glazing, building proportions, HVAC and water quality. WELL describes the type as appropriate where up to 25% of the project area is fully controlled by the owner, meaning 75% or more is occupied by one or more tenants. That is a criterion for a voluntary building standard, not a general commercial-real-estate statistic or a definition that overrides a lease.
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Common mistakes and how to correct them
Relying on the label
Problem: “Shell,” “Category A” or “turnkey” is treated as a complete scope. Fix: attach drawings, specifications and a responsibility matrix that define each system and finish.
Confusing a connection with capacity
Problem: A capped pipe or cable is assumed to support the tenant’s demand. Fix: record design capacity, spare capacity, diversity assumptions and the cost of upgrades.
Ignoring approvals
Problem: Physical completion is mistaken for legal permission to occupy or trade. Fix: list every certificate, inspection and operator licence, with a named owner and deadline.
Starting fit-out before the base is stable
Problem: Tenant finishes are installed while leaks, movement, dust or incomplete services remain. Fix: set objective conditions for access, protect completed work and provide a defect-correction route.
Underestimating tenant-specific systems
Problem: Data, security, acoustics, specialist ventilation or equipment loads appear late. Fix: issue the operational brief early and test it against structural, electrical, HVAC and fire limits before tender.
Leaving reinstatement undefined
Problem: The lease requires removal of alterations but does not say which base-building items must remain. Fix: agree a reinstatement schedule, photographic record and approval process at the start.
Decision guide for owners and tenants
Core-and-shell is usually the better fit when
- The building will host different tenants with varied layouts or technical needs.
- The tenant wants control over finishes, workplace design or specialist installations.
- The owner can manage multiple fit-out interfaces and a longer, staged occupancy programme.
- The lease can clearly allocate design, approvals, capacity and defect responsibilities.
Turnkey is usually the better fit when
- The intended use and room schedule are known before construction starts.
- The owner or occupier values one coordinated delivery package and a defined ready-to-use date.
- Standard finishes and systems are acceptable, reducing late design changes.
- The contract can specify operational testing, documentation and all approvals needed for opening.
Ask for an intermediate solution when
A raw shell would leave too much work, but a fully bespoke turnkey fit-out would constrain the tenant. A defined Category A or similar base fit-out can provide ceilings, raised floors, basic lighting and distributed services while preserving tenant control over partitions, data, joinery and branding. Confirm the local market definition instead of assuming the term has one fixed content.
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Core-and-shell gives owners a durable base building and gives tenants design freedom, but the tenant carries more fit-out work and interface risk. Turnkey aims to deliver a finished, usable space and simplify coordination, but only the agreed specification determines what “finished” includes. Before signing, compare drawings, capacities, finishes, approvals, milestones, testing, defects and change rules line by line. The contract’s boundary—not the marketing label—determines what owners and tenants actually get.
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