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Portsoken House, Aldgate: former warehouse floor converted to offices by Craftex

Warehouse to Office Conversion in London

Turn an empty or oversized warehouse into offices your team wants to work in. We survey, design and build warehouse conversions in London as one team, from a railway arch to 1,550 sq m across two floors in Aldgate.

Trusted by Leading Businesses

  • Trainline
  • Auto Trader
  • YouTube
  • Medusa
  • Fuse
  • Drake's
  • POST
  • Close Connection
  • Marnie.
  • Vortex Post
  • Blob
  • Minds Ahead
  • Miiissy
  • Fora
  • gama healthcare
  • Equinix
  • Hubble
  • B-engineering

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Our expertise in warehouse conversion

A warehouse gives you height, open floors and a lower rent per square metre. It rarely gives you insulation, daylight, heating or a fire strategy built for people at desks. Closing that gap is the job.

  • Survey and structure

    What the shell, roof and slab can take, checked before any layout is fixed.

  • Layouts around how you work

    Offices, meeting rooms, studios and storage zoned around your daily flow. More on space planning.

  • Mezzanines and partitions

    Extra floor area inside the existing height, freestanding where the structure cannot be touched.

  • Heating, cooling and ventilation

    Zoned systems so you only heat and cool what you use. See M&E services.

  • Fire safety and compliance

    Escape routes, emergency lighting and fire-rated construction for office use.

  • Cat A and Cat B fit-out

    From base build to furnished offices. See our office fit-out service.

How your warehouse conversion runs

We walk the building with you, check its condition and use, and ask how your teams actually work: who sits where, what is stored, how goods move in and out.

We draw the layout and price it as a lump sum against a clear scope, so you know the cost before you commit.

Changing a storage building to office use usually needs planning permission, and the works need Building Regulations approval. We prepare the drawings and applications and build that time into your move-in date.

At Drake's railway arch nothing could be fixed to the structure, so we built a fully self-supported interior: freestanding walls, independent service frames and a complete M&E strategy.

Every snag closed before you move in, and our team on hand afterwards as your needs change.

Drake's railway-arch warehouse converted by Craftex, London

Free site audit for your warehouse

Tell us about the building and how you want to use it. We will visit, show you what it can become and what it will take.

Pallet racking and storage at the Banbury warehouse

Free Warehouse Refurbishment & Fit-Out Guide

A simple checklist covering layout planning, budgeting, compliance and fit-out essentials, so your project stays on track from start to finish.

Why businesses choose Craftex for warehouse conversions

  • Design and build, one contract

    One point of contact from survey to handover.

  • Lump-sum price

    Clear scope, predictable spend, easier sign-off.

  • Built around your operations

    Nights, weekends and phasing, as at Portsoken House with tenants in occupation.

  • Around 60% in-house labour

    Less waiting and tighter control of quality.

  • Zero-snag handovers

    Weekly quality checks; snags closed before you move in.

  • Insured and certified

    ISO and CHAS. Public and employers' liability cover of £10M each.

Independently Certified Contractor for Quality, Safety & Reliability

Warehouse conversion: your questions

Do I need planning permission to convert a warehouse into an office in London?

In most cases, yes. Moving from storage to office use usually needs planning permission, and the works need Building Regulations approval. We check the building's current use at the site audit and prepare the drawings and applications.

How long does a warehouse to office conversion take?

It depends on size, condition and scope. Drake's 500 sq m railway-arch conversion took 8 weeks; the 1,550 sq m conversion at Portsoken House in Aldgate took 7 months. Allow time before that for survey, design and approvals.

Can you handle both design and construction?

Yes. We design the layout, prepare the drawings, carry out the fit out and hand over the finished space, all under one contract.

What upgrades does a warehouse need to work as an office?

Usually insulation, heating and ventilation, fire safety, partitions, lighting, plumbing and accessibility. We assess each of these at the site audit.

Can I keep part of the warehouse for storage or production?

Yes. Drake's kept a manufacturing zone, structured storage and a dispatch route alongside new offices, a kitchen and a photography studio.

Do you work with tenants as well as owners?

Yes. Drake's were tenants planning a five-year stay, so every choice was made to be durable without overspending.

Can I convert a warehouse into flats instead?

That is a residential conversion. See commercial to residential conversion.

What size of project do you take on?

Warehouse conversions and fit-outs from £100,000 to £10M+. For refurbishing a warehouse that stays a warehouse, see warehouse refurbishment and fit-out.

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