Quick answer: A freestanding mezzanine floor adds a second (or third) level of rentable units inside an existing self storage building, so it can double or triple net lettable space without major structural work. PSL designs, manufactures and installs them across the UK and Europe, with staircases, loading gates and building regulations support included.
Here are the questions we hear most about this topic, answered directly.
What is a freestanding mezzanine floor in self storage?
It is a steel platform that stands on its own columns inside a building, rather than being fixed into the structure. In a self storage facility it carries partitioned units, corridors and access, so the same footprint earns rent on more than one level.
How much extra space can a mezzanine give me?
PSL says mezzanines can double or triple net lettable space, depending on the height of the building and the layout. Start with your usable height and net lettable area; see our guide to net lettable area.
How much does a self storage mezzanine cost?
Cost depends on span, loading, height, access and finishes. Use our practical mezzanine floor cost per m2 guide to build a budget, then ask for a quote based on your drawings.
Can a mezzanine lower my business rates?
PSL describes freestanding mezzanines as temporary installations, which can reduce business rates compared with permanent structural changes. Rating treatment depends on the individual property, so confirm with your rating adviser or the Valuation Office Agency.
What staircases and loading features are available?
PSL offers a range of staircase widths to suit the layout and your customers, plus up-and-over loading gates to make moving goods to and from upper levels easier. Rolling staircases are also available.
Do mezzanine floors need building regulations approval?
Usually yes. Fire safety, escape routes, loading and structure all need to be considered. PSL handles application forms, calculations and escape route planning and liaises with the local authority and fire brigade. See building regulations and fire protection.
What does a PSL project include?
Design, manufacture and installation, supply and fit or labour only, plus turn-key project management. Funding is available through our finance partner, so you can fund projects in full or in phases. See our completed projects, including a self storage conversion in Rygge, Norway.
Frequently asked questions
Can a mezzanine double my self storage space?
PSL says mezzanines can double or triple net lettable space, depending on building height and layout.
Are PSL mezzanines freestanding?
Yes. They are freestanding structures, described as temporary installations, which can affect business rates.
Does PSL install mezzanine floors across the UK?
Yes. PSL designs, manufactures and installs across the UK and Europe.
Can I finance a mezzanine project?
Yes. PSL works with an approved finance partner so projects can be funded in full or in phases.
Last updated: 11 November 2026