Category
The move-in job everyone does first, decided by two measurements: how wide the opening is and how heavy the fabric is.
Windows are the move-in job everyone does first and the one with the widest spread of published capacities on this site. A no-drill curtain bracket that taps into wooden trim publishes 20 lb. A light twist-and-fit tension rod publishes a maximum recommended load of 4 lb. Another publishes 2.33 lb. Same shelf in the same store, an order of magnitude apart, and almost nobody checks.
Which one you can use is decided by your window rather than your taste. Bracket systems need wooden trim between half an inch and one inch wide -- the manufacturer states this, and also states they are not for oak, PVC, MDF, crown molding or metal. Tension rods need a reveal to push against and mount inside the opening, which means they cannot overhang the window at all.
Start with what size tension rod you need if you are mounting inside the reveal, or no-drill curtain rod brackets if you have wooden trim and want the curtain to hang wide. If you are unsure which family your window belongs to, tension rod vs curtain rod is the decision in one page.
Roundup
Brackets and tension rods ranked on published load, from 20 lb to a 2.33 lb we would skip.
Top pick: Kwik-Hang Single Curtain Rod Bracket
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Comparison
Inside vs outside mounting, published loads, and which windows can even take a bracket.
Comparison
How no-drill blind mountings differ from drilled ones, and what each costs at move-out.
Guide
2.33 lb to 22 lb: published tension rod loads in one table, per model.
Guide
Published adjustment ranges, how to measure, and why a rod at the end of its range slips.
Guide
The method for both approaches, with the measurements that decide which one you can use.
Measure two things before you look at any product: the width of the opening, and the width of the wooden trim at the top corner if there is any. Those two numbers decide everything else.
Bracket systems become available, and they are the highest-capacity damage-free option for a window: 20 lb published, enough for lined and blackout drapes, with the curtain hanging outside the opening where it actually blocks light. They tap in with a hammer and lift off at move-out. The manufacturer is explicit about what they will not work on -- hardwoods like oak, PVC, crown molding, MDF and metal trim -- which is more honesty than this category usually offers.
Tension is the answer, and the rating varies enormously by model. One spring tension rod we cover publishes 22 lb; a twist-and-fit publishes 4 lb at 28-48 inches and 7 lb at 48-84; a light multipack publishes 2.33 lb. Read the figure for the exact model rather than the category, and remember the geometric constraint: a tension rod lives inside the reveal, so your curtain cannot overhang the window and you lose some light control at the edges. The load figures are collected in how much weight a tension rod holds.
No-drill blind options exist and mount inside the frame, and the trade-off against drilled blinds is mostly about how much window you lose and how well the fit holds over time. No-drill vs drilled blinds lays out both sides.
The practical method -- what to buy, in what order, and how to hang the curtain once you have it -- is in how to hang curtains without drilling. Tension products turn up in other rooms too: the same mechanism runs a shower caddy and a closet rod in apartment closet organization.
Every pick on this site is chosen on published specification, never on hands-on use -- read the method. New to renting? Start with the renter-proof playbooks.