Bulky and heavy items require a different logistics network than standard parcels — often a dedicated truck and sometimes a delivery team — which is priced separately from a retailer's normal shipping fee.
Not by default in most cases. Check the product page specifically for an assembly or installation line; if it is not mentioned, assume it is not included and confirm before ordering.
Around named seasonal campaigns (back-to-school, national-day dates, year-end clearance) more than at random points in the year — this category discounts in windows rather than continuously.
The delivery route — doorways, stairwells, and lift dimensions if applicable — not just the floor space in the room. A sofa that fits the room can still fail to reach it.
