What Drives the Cost of Off-site Intumescent Coatings?
The cost of off-site intumescent coating depends on the steel package, required fire rating, section sizes, preparation requirements, coating system, programme and documentation needs. The quickest route to a useful estimate is to send drawings or a steel schedule for review.
Why there is no useful one-size-fits-all rate.
- Steel section sizes affect coating requirements.
- Required fire rating changes material and labour assumptions.
- Specification and coating system matter.
- Surface preparation requirements vary.
- Programme and logistics can change scope.
- Documentation requirements affect delivery.
Fixed web prices are usually misleading without project details — a useful estimate needs the steel schedule, fire rating and specification.
The main factors that affect off-site coating cost.
Steel sections & surface area
Coating requirement is tied to steel geometry and exposure, not just tonnage. Section factor matters more than weight.
Required fire rating
Different fire resistance periods can change coating thickness and system requirements.
Coating system & spec
Project specification, approved products and finish requirements can affect cost.
Preparation requirements
Surface condition, primer compatibility and preparation standard all matter.
Access, handling & logistics
Off-site coating still needs careful handling, sequencing, transport and protection.
Programme constraints
Urgent or phased packages may require different planning and resourcing.
QA & documentation
Handover requirements, photos, DFT records and traceability can affect scope.
What information helps Midsummer price accurately?
- Drawings.
- Steel schedule.
- Required fire rating.
- Specification or fire strategy.
- Project location.
- Programme dates.
- Coating system preference, if already specified.
- Any known phasing or delivery constraints.
Partial information is fine for an initial review.
The cheapest route is not always the lowest-risk route.
- On-site disruption can create hidden costs.
- Delays around access and weather can affect programme.
- Rework after damage or poor sequencing can be expensive.
- A controlled off-site route can reduce uncertainty on suitable packages.
Price is best understood as risk management, not just coating cost per tonne. See how the review process confirms scope before any work is committed.
Where off-site coating can reduce overall project risk.
- Tight programme.
- Difficult site access.
- Weather-sensitive works.
- Fabricator-controlled package.
- Projects where other trades would clash with on-site application.
Sometimes on-site coating is the better commercial answer.
- High damage risk during transport or installation.
- Complex installation details.
- Late design changes.
- Small packages where off-site logistics add unnecessary complexity.
See the full off-site vs on-site comparison.
Cost & pricing: common questions.
- Can you give a square metre or tonne rate?
- Not usefully without the steel details, fire rating and specification. A fixed rate can be misleading if the coating requirement changes.
- What is the fastest way to get a quote?
- Send drawings, a steel schedule, required fire rating, project location and programme dates.
- Does a higher fire rating cost more?
- Often, because coating thickness and system requirements may increase, but this depends on the steel sections and specification.
- Is off-site coating cheaper than on-site coating?
- It depends. Off-site may reduce programme and site-access risks on suitable packages, but on-site can still be better for some steelwork.