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FSC Certification Explained
What it means and how to verify it
Contents
What is FSC certification?
The Forest Stewardship Council (FSC) is an international non-profit that sets standards for responsible forest management. FSC certification provides assurance that timber and wood-based products come from forests managed in an environmentally, socially, and economically responsible way.
FSC certification operates through a chain-of-custody system. This means every link in the supply chain - from forest to final product - must be independently audited and certified. The system is designed to prevent uncertified or illegally sourced timber from entering the certified supply chain.
Chain of custody - every link is audited
- 1
Forest
Sustainably managed
- 2
Sawmill
Primary processing
- 3
Manufacturer
Product creation
- 4
Distributor
Certified supply
- 5
Your project
Verified on arrival
The three FSC labels
Not all FSC labels are equivalent. Understanding the differences helps you evaluate the level of assurance each provides.
Highest assurance
Made entirely from FSC-certified forests. This is the highest level of assurance that materials come from responsibly managed sources.
Most common in construction
A mix of FSC-certified, recycled, and controlled wood. At least 70% must be FSC-certified or recycled.
Zero virgin timber
Made entirely from reclaimed or recycled material. Reduces demand on virgin timber.
Note. FSC Mix is the most common label in construction products. It still provides meaningful assurance - the controlled wood component must meet minimum standards to exclude illegally harvested or high-conservation-value forest sources.
How to verify FSC claims
Verification is straightforward but often overlooked. Taking a few minutes to check a claim can prevent greenwashing in your supply chain.
1.Find the certificate number
Every FSC-certified company has a unique licence code (e.g. FSC-C123456). Look on packaging or documentation.
2.Verify online
Enter the code at info.fsc.org to confirm the certificate is valid and current.
3.Check scope
Make sure the certificate covers the specific product you're buying, not just the company.
4.Check expiry
Certificates are typically valid for 5 years. Ensure it hasn't lapsed.
5.Request documentation
Ask the supplier for a copy of their chain-of-custody certificate if not already on their profile.
FSC vs PEFC
PEFC (Programme for the Endorsement of Forest Certification) is another major forest certification scheme. Both are credible, but they differ in approach.
FSC sets a single global standard with national adaptations. PEFC endorses national certification schemes that meet its benchmark requirements. In practice, both provide meaningful assurance of responsible forestry, though FSC is generally considered more stringent by environmental organisations.
Many suppliers carry both certifications. When evaluating products, focus on whether the specific product you need is covered by either scheme, and verify the certificate as described above.
FSC
- Single global standard with national adaptations
- Generally considered more stringent
- Three label tiers (100%, Mix, Recycled)
PEFC
- Endorses national certification schemes
- Broader, more flexible approach
- Widely recognised internationally
What FSC does not tell you
FSC certification is valuable, but it has boundaries. Understanding its limitations prevents over-reliance on a single indicator.
- FSC does not measure embodied carbon - a certified product may still have high lifecycle emissions from processing and transport
- FSC does not guarantee the product is locally sourced
- FSC does not assess the product's technical performance, durability, or fire safety
- Certification status can change - always verify current validity before specifying
Where FSC shows up in building projects
FSC is not just for structural timber. It can appear on many wood-based products, and each one needs the same basic verification.
| Product | Why FSC helps | Extra checks |
|---|---|---|
| Structural timber | Confirms responsible forest sourcing | Strength grade, treatment, moisture content |
| Plywood and OSB | Covers wood fibre chain-of-custody | Formaldehyde class, structural grade, exposure class |
| Doors and joinery | Useful for timber content | Fire rating, finishes, hardware, veneer source |
| Decking and cladding | Responsible sourcing for visible timber | Durability class, treatment, fixings, maintenance |
| Furniture and fit-out | Helps with procurement and client reporting | Finish emissions, repairability, supplier documentation |
Simple procurement wording
For project specifications or supplier messages, be specific enough that the claim can be checked.
- Ask for FSC 100%, FSC Mix, FSC Recycled, or PEFC certification for the exact product supplied.
- Request the chain-of-custody certificate number and licence code.
- Require delivery notes or invoices to identify the certified product line.
- Avoid vague wording such as 'sustainable timber' without a named scheme.
- For reclaimed timber, FSC may be less relevant than provenance, condition, and suitability.
Useful links
Standards & schemes
Official certification body
Visit the official website for criteria, application process, and certified product databases.


