What Is Fit-Out Work? Shell & Core, Cat A and Cat B Explained

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  • What Is Fit-Out Work? Shell & Core, Cat A and Cat B Explained

Fit-out is the work of turning an empty or unfinished interior into a usable, occupiable space. It covers partitions, ceilings, flooring, joinery, finishes and the mechanical, electrical and plumbing systems that serve the layout. Fit-out begins after the building’s structure and envelope are complete, and it is what separates a bare concrete floor plate from a working office, restaurant or clinic.

In the UAE, fit-out is a distinct contracting discipline with its own permits, approved contractor lists and authority process. This guide explains what the work actually involves, the difference between shell and core, Cat A and Cat B, how a fit-out project runs in Dubai, and the terminology you will encounter in a contract.


Fit-out in one table

TermWhat it means
Fit-outCompleting the interior of a building so it can be occupied and used
Shell and coreThe base structure, envelope, lifts, stairs and core services. No interior finishes
Cat AThe landlord’s basic interior completion: raised floor, ceiling, base HVAC, lighting, fire systems
Cat BThe tenant’s fit-out: layout, partitions, joinery, branding, MEP modification, finishes
RefurbishmentUpgrading or replacing an existing fit-out in an occupied or previously occupied space
Interior designThe design discipline that determines how the space looks and functions. Fit-out is the execution of it

The most common confusion is between fit-out and interior design. Interior design produces the drawings, the material selections and the intent. Fit-out builds it. Some firms do both under one contract, which is what “design and build” means.


The three handover conditions

Almost every fit-out conversation in Dubai starts with the same question: what condition is the unit in? The answer determines the scope, the cost and the programme more than anything else.

Shell and core

The developer has completed the building’s structure, external envelope, lift cores, staircases, common areas and primary building services up to the floor. Inside your unit there is bare concrete, exposed slab soffit, and capped service connections at the riser.

There is no ceiling, no raised floor, no distributed air conditioning, no lighting, no partitions, and often no toilets within the tenancy.

Shell and core units rent for less and cost considerably more to fit out, because you are building the base layer and the tenant layer together. If you are comparing two units on rent alone, this is the variable that will undo the comparison.

Cat A

The landlord has taken the shell and installed a generic base fit-out to a lettable standard. In a Dubai Grade A tower this usually means:

  • Raised access floor
  • Suspended ceiling grid with tiles
  • Primary HVAC distribution with FCUs or VAV boxes
  • Basic lighting grid
  • Fire detection and sprinkler coverage to an open-plan layout
  • Finished floor and wall surfaces to core areas
  • Electrical distribution board at the tenancy

The result is a complete but entirely generic space. No walls, no rooms, no identity.

Be careful here. “Cat A” is not a legally defined standard and Dubai landlords apply it loosely. Some units genuinely arrive with everything above. Others arrive with a ceiling grid, a few light fittings and an unfinished floor. Get the base build specification in writing and survey the unit before you sign, because the gap between a strong Cat A and a weak one can be AED 60 to 100 per square foot of extra work.

Cat B

This is the tenant fit-out and the part most people mean when they say “fit-out”. It covers:

  • Partition layout: meeting rooms, offices, pantry, server room, storage
  • Doors, ironmongery and glazed screens
  • Feature ceilings, bulkheads and acoustic treatment
  • Flooring: carpet, vinyl, tile, timber
  • Joinery: reception desk, fitted storage, pantry units, feature walls
  • Decoration and wall finishes
  • Lighting design and installation
  • MEP modification to serve the new layout
  • Fire system modification to suit the new compartmentation
  • Data cabling, CCTV, access control
  • Branding and signage

Cat B is where the space becomes yours.


Types of fit-out by sector

The word means something slightly different depending on what you are building.

Office fit-out. Layout planning, partitions, meeting rooms, workstations, acoustic performance, data infrastructure. Driven by headcount, density and how the organisation actually works.

Retail fit-out. Shopfront, display systems, lighting design, stockroom, POS positions, customer flow. In a mall, heavily governed by the landlord’s tenant design manual and delivered on a tight, often out-of-hours programme.

Restaurant and F&B fit-out. Front of house plus a commercial kitchen. Kitchen extract and grease management, gas supply, drainage falls, cold rooms, and Dubai Municipality Food Safety requirements on finishes and layout. Technically the most demanding sector for its size.

Healthcare fit-out. Clinics, medical centres, dental and diagnostic facilities. DHA requirements govern room sizes, air changes, pressure relationships, medical gas and infection control finishes. Approval-heavy.

Industrial and warehouse fit-out. Office and welfare areas inside a warehouse envelope, plus racking coordination, high-bay lighting, fire suppression appropriate to the storage classification, and loading area works.

Residential fit-out. Villas and apartments. Joinery-heavy, finish-driven, and subject to community developer rules alongside Dubai Municipality approval.


What a fit-out contract includes

A properly scoped Dubai fit-out package covers these trades:

PackageTypical scope
PreliminariesSite setup, supervision, insurance, hoarding, waste removal, protection
Demolition and strip-outRemoving existing partitions, ceilings, flooring, redundant services
Civil worksBlockwork, screeds, plastering, wet area waterproofing
Partitions and ceilingsDrywall, glazed systems, suspended and feature ceilings, bulkheads
Doors and ironmongerySupply, install, hardware, closers, access control interface
FlooringCarpet, vinyl, tile, timber, screed levelling
JoineryReception, storage, pantry, feature walls, bespoke millwork
Painting and finishesDecoration, wall coverings, glazing film, specialist finishes
MEPHVAC, electrical, plumbing, fire, BMS, low voltage
Signage and brandingReception logo, wayfinding, manifestation
Testing and commissioningBalancing, certification, cause-and-effect testing
HandoverSnagging, as-built drawings, O&M manuals, warranties

If a quotation does not break down into something close to this, ask for one that does. Lump sums hide exclusions.


How a fit-out project runs in Dubai

Five stages, roughly 12 to 32 weeks depending on sector and scale.

1. Consultation and survey. Site measurement, condition survey of the existing services, review of the landlord’s tenant fit-out manual, and a clear brief covering headcount, function and budget. Skipping the services survey is the most common early mistake.

2. Concept and design. Space planning, layout options, 3D visualisation, material and finish selection, lighting design. MEP should be in the room at this stage, not after. An engineer reviewing an early layout will tell you whether the ceiling void, the cooling capacity and the electrical load actually support what is being drawn.

3. Approvals. Dubai Municipality fit-out permit, Civil Defence design approval, DEWA where the load changes, DHA for clinical projects, and the landlord or building management NOC. This runs 4 to 8 weeks for a standard office and longer for regulated sectors. It runs in parallel with procurement, not after it.

4. Construction. Mobilisation, strip-out, civil works, first fix MEP, partitions and ceilings, second fix, finishes, joinery installation, commissioning. Sequenced so that trades are not fighting for the same zone.

5. Handover. Snagging and defect resolution, Civil Defence inspection, system testing and certification, as-built drawings, O&M manuals, equipment warranties, and release of the landlord’s fit-out deposit.


Who does what

Fit-out contractor. Builds it. Holds the trade licence, the approved contractor registrations, and the site responsibility.

Interior designer. Produces the design intent, the layouts and the material specification.

MEP consultant or contractor. Designs and installs the services, and prepares the drawings that go to DEWA and Civil Defence.

Approved consultant. In the UAE, authority submissions must come through consultants registered with the relevant body. Civil Defence and DEWA both maintain approved lists.

Landlord or building management. Approves the works, issues the NOC, sets the working hours and access rules, holds the deposit.

Authorities. Dubai Municipality, Dubai Civil Defence, DEWA, plus DHA or KHDA depending on sector.

On a design and build contract, one firm holds the first three roles and manages the rest. That is the argument for integration: when the design does not fit the services, there is no gap between two contracts for the problem to fall into.


Fit-out terminology you will meet in a contract

TermMeaning
Preliminaries (prelims)Time-related site costs: supervision, insurance, welfare, protection. Runs weekly whether work progresses or not
Provisional sumA placeholder allowance for work not yet designed. It is not a price and it will change
Variation order (VO)A change to the agreed scope, priced separately. The main source of budget overrun
SnaggingThe defect list produced before handover. Items the contractor must correct
Defects liability period (DLP)The window after handover, usually 12 months, during which the contractor returns to fix defects
RetentionA percentage, usually 5 to 10%, withheld from payment until the DLP ends
NOCNo Objection Certificate. Required from the landlord and various authorities before works start
As-built drawingsDrawings recording what was actually installed, issued at handover
O&M manualOperation and maintenance documentation for installed systems
First fix / second fixFirst fix is the work hidden behind finishes, such as cabling and pipework. Second fix is the visible installation that follows
Making goodRepairing damage to base build or adjacent areas caused during the works
Practical completionThe point at which the space is usable and handed over, even if minor items remain

Frequently asked questions

What is fit-out work?

Fit-out work is the process of completing the interior of a building so it can be occupied. It includes partitions, ceilings, flooring, joinery, decoration and the mechanical, electrical and plumbing systems serving the layout. Fit-out starts once the building’s structure and external envelope are complete.

What is the difference between fit-out and construction?

Construction builds the structure, envelope and core of a building. Fit-out completes the interior within it. On a new tower the developer handles construction, and each tenant handles the fit-out of their own unit.

What does shell and core mean?

Shell and core means the building’s structure, external envelope, lift cores, staircases and primary services are complete, but the interior of the unit is bare. No ceiling, no raised floor, no distributed air conditioning, no partitions. The tenant carries out both the base interior works and their own fit-out.

What is the difference between Cat A and Cat B fit-out?

Cat A is the landlord’s generic interior completion: raised floor, ceiling grid, primary HVAC, basic lighting and fire systems. Cat B is the tenant’s fit-out that follows, covering layout, partitions, joinery, finishes, branding and MEP modification. Cat A makes a unit lettable. Cat B makes it usable by a specific occupier.

Is fit-out the same as interior design?

No. Interior design is the design discipline that determines layout, materials, lighting and aesthetics. Fit-out is the construction work that builds it. A design and build contractor delivers both under one contract, which removes the coordination gap between the two.

What is the difference between fit-out and refurbishment?

Fit-out completes a space that has never been occupied or has been stripped back to Cat A. Refurbishment upgrades or replaces an existing fit-out. Refurbishment usually includes a strip-out phase and often has to work around an occupied or partially occupied building.

How long does a fit-out take?

In Dubai, 12 to 32 weeks from appointment to handover depending on sector and scale. Design and approvals take 4 to 8 weeks. Construction takes 8 to 24 weeks. Offices sit at the shorter end, healthcare and hospitality at the longer.

Do I need a permit for fit-out work in Dubai?

Yes. A Dubai Municipality fit-out permit is required for interior alteration works. Civil Defence approval is required for anything affecting fire detection, suppression or escape routes, which most partition layouts do. DEWA approval applies where the electrical load or supply changes. The landlord or building management will also require a separate NOC before works begin.


Planning a fit-out in Dubai

The projects that run well are the ones where the layout, the services and the approvals were all considered before anyone mobilised to site. The projects that run badly are the ones where the design was frozen first and the constraints were discovered afterwards.

Hitesh Design & Build has delivered fit-out projects across Dubai and the UAE since 1994, covering interior design and fit-out, MEP and technical services and architectural design with authority approvals under a single contract. Our project case studies cover office, retail, hospitality, healthcare and residential work.

If you have taken a unit or are about to, tell us about it. We will survey the space and tell you what it will take before you commit to a design.