Steel has traditionally been one of the default materials for industrial walkways, platforms, staircases and access structures. For many projects, the decision between steel and GRP has therefore involved balancing initial material cost against installation requirements, corrosion resistance and maintenance over the life of the structure.
Changes in the UK steel market during 2026 make that comparison worth revisiting.
From 1 July 2026, the UK introduced new steel trade measures that reduced overall tariff-free import quotas by 51% compared with the previous safeguard arrangement. Steel imported above the applicable quotas is now subject to a 50% tariff.
At the same time, structural steel prices have risen considerably. Recent industry reporting has placed structural steel at around £1,000 per tonne, compared with approximately £700 per tonne earlier in the year.
For engineers, contractors and asset owners planning new access infrastructure, this changes some of the assumptions traditionally made when comparing steel with GRP.
Initial Cost Is Only One Part of the Comparison
There is no universal answer to whether a GRP or steel access structure will cost less initially.
The result depends on the structure being designed, loading requirements, spans, fabrication, supporting structure, surface treatment, transport and installation.
What has changed is the size of the cost advantage that steel has traditionally been assumed to hold.
As steel prices rise, it becomes increasingly important to compare the complete installed structure rather than simply comparing the cost of the raw materials.
A walkway or maintenance platform does not arrive on site as a tonne of steel or a collection of GRP profiles. It has to be designed, fabricated, transported, handled and installed.
Those additional stages can materially affect the final project cost.
Weight Has a Direct Effect on Installation
GRP structural components are considerably lighter than equivalent steel components in many access applications.
That matters when access structures have to be installed around existing process equipment, on rooftops, inside treatment works or in areas where lifting equipment has restricted access.
Lower component weight can reduce handling requirements and make sections easier to position during installation.
It can also reduce loads imposed on existing structures, although the actual supporting requirements must always be determined from the structural design rather than material weight alone.
For refurbishment projects in particular, installation constraints can be just as important as the purchase price of the material.
Corrosion Changes the Long-Term Calculation
The difference becomes more pronounced where the access structure operates in a corrosive environment.
Water treatment works, chemical processing facilities, marine installations and some industrial plants expose access structures to persistent moisture, chemicals or aggressive atmospheric conditions.
Steel structures used in these environments normally require an appropriate corrosion protection system. The specification will depend on the environment and may include galvanising, protective coatings or other treatments.
Those systems can themselves require inspection, maintenance and eventual renewal.
GRP does not corrode in the same way as carbon steel. Where the resin system and product specification are appropriate for the operating environment, this can substantially reduce the maintenance associated with corrosion protection.
This is why the cheapest structure to purchase is not necessarily the cheapest structure to own.
Maintenance Access Can Be Expensive
Maintenance cost is particularly important for elevated and difficult-to-access structures.
Repainting or repairing a structure located at ground level is one thing. Carrying out the same work above process equipment, tanks, pipework or operational machinery can require:
- Temporary access
- Scaffolding
- Lifting equipment
- Isolation of equipment
- Restricted working areas
- Additional labour
- Planned shutdown periods
The cost of maintaining the protective system can therefore extend considerably beyond the paint or coating itself.
For access structures expected to remain in service for many years, these practical maintenance requirements should form part of the original material assessment.
Steel Supply Is Also Changing
Price is not the only issue affecting steel procurement.
The UK’s new trade measure limits the amount of relevant steel that can enter the country tariff-free. Overall quota volumes have been reduced by 51%, with a 50% duty applying to applicable imports above quota.
The measures form part of the Government’s wider strategy to protect domestic steelmaking against global overcapacity while maintaining supply to downstream industries.
That does not mean steel is becoming unavailable.
It does mean procurement conditions are changing, and material availability, lead times and current pricing should be checked when access projects are being costed.
GRP and Steel Should Still Be Compared Project by Project
Rising steel prices do not mean GRP automatically replaces steel in every application.
Material selection still needs to account for:
- Structural loading
- Span requirements
- Operating environment
- Fire performance
- Temperature
- Chemical exposure
- Electrical requirements
- Installation conditions
- Maintenance access
- Design life
There will continue to be structures for which steel is the appropriate engineering choice.
Equally, there are environments where GRP’s corrosion resistance, lower weight and electrical properties make it particularly suitable regardless of movements in steel prices.
The important change is that assumptions about relative cost should not be carried forward from previous projects without checking them against current market conditions.
Compare the Complete Access Structure
For an industrial walkway, platform or complete plant access structure, the useful comparison is not simply GRP price versus steel price.
It should include design, material, fabrication, corrosion protection, transport, installation, inspection, maintenance and eventual replacement.
That gives a more meaningful indication of what an access structure is likely to cost throughout its working life.
With UK steel prices and import arrangements changing significantly during 2026, there is a stronger case for carrying out that comparison before automatically specifying the material traditionally used on previous projects.
Frequently Asked Questions
Does a rise in steel prices automatically make GRP cheaper?
No. The cost comparison depends on the design, quantities, structural requirements, fabrication and installation. Current prices should be compared for the complete project rather than assuming either material will always be cheaper.
Should installation costs be included when comparing GRP and steel?
Yes. Component weight, site access, lifting requirements, installation time and the complexity of working around existing equipment can all affect installed cost.
How should corrosion protection be included in a cost comparison?
Where steel requires galvanising, coating or another protective system, both the initial treatment and anticipated inspection, repair and renewal should be considered.
Can existing steel specifications be changed to GRP?
Potentially, but GRP should not simply be substituted into a steel design. The structure needs to be assessed for the mechanical properties, spans, connections and loading requirements of the proposed GRP system.
When is whole-life cost particularly important?
Whole-life assessment becomes particularly relevant where access structures are difficult to reach for maintenance or operate in wet, chemical, marine or otherwise corrosive environments.
Will UK steel prices continue to rise?
Future prices cannot be predicted reliably. The relevant point for current projects is that UK steel procurement conditions changed materially in 2026, so specifications and budgets based on historic pricing should be checked against current quotations.