B2B marketplace · Belgium
Turn your surplus materials back into revenue.
The B2B marketplace for surplus and reusable construction materials. Manage your inventory for free, list what you don't use in under a minute, and find quality materials from verified companies near you.
Verified companies · Free registration · Secure trading
- List in 1 minute
- Verified companies only
- Secure payment
- Across Belgium
01Why now
The industry throws away good material every day.
Over-ordering, cancelled projects, returns, slow movers, demolition material — usable material piles up because selling it is slower than tossing it. So it gets stored, and eventually dumped.
Classifieds sites are built for consumers. Cold-calling is slow. The skip is the default. There was no reliable, professional B2B channel — until now.
02How it works
From surplus to sold, in three steps.
List
Take a photo. Greyn recognises the material and drafts the description and specs. You review and publish, in under a minute.
Find
Buyers search and filter by material, category, location and availability. Saved searches alert them as soon as matching supply appears.
Trade
Agree, pay and arrange pickup through Greyn, with proof of payment on every transaction and secure payment, only between verified companies.
03For sellers
Sell the inventory that's costing you money.
Free up warehouse space, recover dead capital and skip the paperwork. Listing takes a minute, not an afternoon.
- Effortless listing — a photo becomes a full listing with specs and a suggested price.
- Free inventory management — manage your entire inventory digitally in Greyn (overview, filters, a detail page per item), completely free. Turn any inventory item into a listing with one click when you want to sell.
- Bulk & demolition imports — turn inventories and demolition-inventory PDFs into listings automatically.
- You stay in control — set your price, choose your pickup terms.
- No cure, no pay — listing is free. Greyn only charges a commission when you sell.
Who it's for
Wholesalers & distributors
move dormant stock and returns.
Contractors & site managers
clear surplus from over-ordering and design changes.
Demolition contractors
turn urban-mining stock into a scalable sales channel.
Free tool
Manage your inventory for free. Sell whenever you want.
Get a grip on your material right away — before you sell anything. Register your inventory in Greyn, keep it up to date, and turn any item into a listing with one click.
Start with your inventory
04For buyers
Find quality materials, faster and cheaper.
Stop cold-calling suppliers across the country. Search local, verified supply and buy with confidence.
- Lower your material costs — without compromising on quality — surplus and reusable materials at sharp prices.
- Local availability — filter by location and avoid the lead times of new orders.
- Buy with confidence — verified sellers, clear specs and secure payment.
- Active Matching — save a search and get notified as soon as the material you need comes in.
05Catalogue
What's on Greyn
Browse the categories and find what you're looking for.
06Comparison
Built for professionals, not just another classifieds site.
See how Greyn compares to classifieds and cold-calling — built for verified B2B construction trade.
| What you need | Classifieds sites | Cold‑calling | Greyn |
|---|---|---|---|
| Verified B2B parties only | Classifieds sites | Cold‑calling | Greyn |
| Construction-specific specs & categories | Classifieds sites | Cold‑calling | Greyn |
| List in 1 minute (photo → listing) | Classifieds sites | Cold‑calling | Greyn |
| Local supply bundled in one place | Classifieds sites | Cold‑calling | Greyn |
| Secure payment & pickup arranged | Classifieds sites | Cold‑calling | Greyn |
07Impact
Good for your margin. Good for construction.
Every material that finds a second home instead of the skip is a win — for your costs and for the sector's footprint. Greyn helps you keep materials in use and gives you the data to prove it.
- CO₂ & reuse tracking for ESG and CSRD reporting.
- Circular procurement supported for public and tendered projects.
- Aligned with Flemish and European circular-construction goals (OVAM, Vlaanderen Circulair).
08FAQ
Frequently asked questions
Registering and listing are free, with no subscription. Greyn only charges a commission on a successful sale.
Every company on Greyn is verified via a VAT/company-registry check before it can trade. So you always know who you're dealing with.
The buyer pays through Greyn; the amount is securely held and only released after confirmed pickup. You receive proof of payment on every transaction.
Check the material at pickup. Payment is only released after your confirmation, so you don't pay for something that isn't right.
You arrange pickup through Greyn; the seller sets the pickup terms and location.
Yes. Inventory management is completely free and works even before KYC registration. You can sell once your company is verified.
Across Belgium, available in Dutch, French and English.
09Get started
Ready to make your surplus pay off?
Listing is free; we only charge a commission on a successful sale. Join the professional marketplace for construction materials.