Why sorting saves money on disposal
When a bin arrives at the transfer station full of mixed debris, wood, drywall, metal, concrete, the facility must either hand-sort it or charge a premium to process it as general demolition waste. Hand-sorting is labor-intensive, and that cost gets passed back to you as an overage or a higher base rate. Contractors who separate materials on-site avoid this penalty entirely.
The municipality's receiving facility accepts different material streams at different rates. Clean fill (soil, rock, clean concrete) moves through one line. Dimensional lumber and framing waste go to another. Drywall has its own path because it contains gypsum and must not contaminate soil. Mixed loads that arrive unsorted either get refused, charged at a mixed rate, or delayed while workers hand-pick materials. None of those outcomes help your schedule or your invoice.
The main material streams on a construction site
Most Windsor job sites generate five distinct waste streams, and each routes to a different facility or processing line:
- Dimensional lumber and framing waste (clean, untreated wood)
- Drywall and gypsum board
- Clean concrete, brick, and masonry
- Soil and clean fill (excavation and site prep)
- Mixed debris (nails, fasteners, insulation, wire, trim)
Dimensional lumber is the easiest to manage. It goes into its own bin, stays dry, and arrives at the facility ready to chip or burn for energy recovery. Drywall must be kept separate because gypsum contamination prevents soil from being reused as fill. Concrete and brick are heavy, a 10 yard bin filled with concrete weighs close to 8 tonnes, so you'll hit weight limits fast and need to plan for overage or use a smaller bin loaded by hand. Soil is similar: roughly a tonne per cubic yard, so a 20 yard bin of soil alone can exceed the tonnage allowance before it's full by volume.
Mixed debris, the catch-all from trim, insulation, fasteners, and small offcuts, is what most contractors struggle with. It's the bin that ends up heaviest per cubic yard because there's no air space between small pieces. It's also the one most likely to contain prohibited items by accident.
Choosing a bin size for each material type
The right bin size depends on what you're throwing away, not just how much space you have on the driveway. Dimensional lumber is light and bulky, you can fill a 30 yard bin with framing waste and still come in under the tonnage allowance. Concrete and soil are the opposite: heavy and dense, so they need smaller bins to stay within weight limits.
For a typical Windsor renovation or demolition, example ranges for bin selection are:
- Lumber and framing: 20 or 30 yard bin, rarely exceeds tonnage allowance
- Drywall: 14 or 20 yard bin, lighter than concrete but denser than lumber
- Concrete and brick: 10 or 14 yard bin only, loaded carefully to avoid overage
- Soil and clean fill: 10 or 14 yard bin, weighed before leaving the site if possible
- Mixed debris: 15 or 20 yard bin, plan for overage because density is unpredictable
Overage charges run about $120 per tonne off the scale ticket, so a load that goes 500 kg over the allowance costs an extra $60. On a tight margin, that's the difference between profit and break-even. Weighing your load before it leaves the site, or calling for a scale ticket estimate, prevents surprises.
What cannot go in any bin
The transfer station and receiving facilities have strict rules about what materials they will accept. Items that arrive in a bin and are discovered at the scale get flagged, and you'll be charged a separate disposal fee or the load gets refused entirely. The most common prohibited items on construction sites are:
- Paint, stains, solvents, and thinners (must go to a household hazardous waste depot)
- Oils, greases, and fuel (environmental hazard, separate disposal required)
- Propane tanks and compressed gas cylinders (explosion risk)
- Asbestos-containing materials (requires licensed disposal and documentation)
- Fluorescent tubes and ballasts (mercury content, hazardous waste stream)
- Batteries and electronics (e-waste, separate facility)
- Appliances with refrigerant still inside (CFC recovery required)
If you're unsure whether a material is prohibited, ask before it goes in the bin. A quick call to confirm saves the cost of a refusal fee or a separate hazardous waste pickup. Most contractors keep a small separate container on-site for paint cans and solvents, it's faster and cheaper than dealing with a flagged load.
How materials route to different facilities
Once your bin leaves the job site, the transfer station sorts loads by material type. Dimensional lumber goes to a wood processor. Drywall goes to a gypsum recycler. Concrete and brick go to an aggregate crusher. Soil and clean fill go to a reuse depot or fill site. Mixed debris gets hand-sorted or sent to a landfill, which is why it costs the most.
The routing is automatic based on what you declare when you book, but if your bin arrives with mixed materials, the facility has to reroute or refuse it. That's why separation on-site matters: it keeps your load on the fast track and avoids delays. If you're working on multiple phases of a job, demolition first, then framing, then finishing, use separate bins for each phase. It costs more upfront but saves time and prevents overage charges.
Planning for weight limits on Windsor sites
Every bin size comes with a tonnage allowance included in the rental price. Example ranges: a 10 yard bin includes about 1.5 tonnes, a 20 yard includes about 2 tonnes, and a 30 yard includes about 3 tonnes. These are estimates based on typical mixed debris density. Heavy materials like concrete, brick, and soil can exceed the allowance in a single load.
If you're hauling heavy debris and clean fill, weigh your load before it leaves the site. Many contractors use a portable scale or call the facility to get an estimate based on volume and material type. If you know you're going over, you have three options: use a smaller bin and make multiple trips, accept the overage charge, or separate the heavy material into a dedicated bin.
On a typical Windsor residential renovation, mixed debris rarely exceeds the allowance on a 20 yard bin. On a demolition or excavation, it almost always does. Budget for overage on heavy jobs, or plan your bin schedule around multiple pickups. The rental period is 7 days on bins up to 15 yards, and 10 days on 20 yards and above, so you have time to manage the load if you plan ahead.
Driveway placement and access on job sites
Where the bin sits on your job site affects how full you can load it and whether the driver can place and collect it safely. A bin on a sloped driveway or soft ground can shift during loading, which creates a safety hazard and can damage the driveway. Driveway protection is a separate service that uses plywood or steel plates to distribute the weight and prevent rutting.
If the bin cannot be placed on a driveway, because there's no access, the ground is too soft, or the site is under construction, the driver may charge a trip fee to place and collect it from the street. The municipality issues permits and placement for street bins, which typically cost between $20 and $150 and can take several days to several weeks to issue. Plan for this if your job site is tight or in a dense area.
On a Windsor construction site, confirm access and placement before booking. A bin that cannot be placed safely costs more and delays your project. If you're unsure, call and describe the site, the team can advise on placement options and whether driveway protection or a street permit is needed.
Booking the right bin for your job
When you contact Windsordumpster to book, have a clear picture of what's going in the bin and roughly how much. Describe the project, renovation, demolition, excavation, and the main materials. The team will recommend a what size bin and explain the tonnage allowance and any extra fees.
If you're unsure whether you need one large bin or two smaller ones, ask about the cost difference. Sometimes two 15 yard bins cost less than one 30 yard bin when you factor in overage charges on a heavy load. The pricing depends on the bin size, rental period, material type, and local disposal rates, so getting a quote with the tonnage allowance stated upfront prevents surprises at invoicing.
Every load is weighed at the transfer station, and the scale ticket is sent with your invoice. That ticket shows exactly what you paid for and why. If you have questions about a charge, the scale ticket is the reference, it's the proof of weight and material type. Sorting on-site, choosing the right bin size, and planning for weight limits are the three ways to keep your disposal costs predictable and your job on schedule.