There is no single minimum that applies across the industry. Some SEO companies will work with you month to month and ask for no minimum at all. Others require a commitment of three, six, or twelve months before they will start. The most common minimum you will see in 2026 is six months, with twelve months close behind. Understanding why those numbers come up so often makes it easier to judge whether a given minimum is reasonable for your situation.
Why companies ask for a minimum at all
SEO produces results slowly. After an agency makes technical fixes, publishes content, and earns links, search engines still need time to crawl the pages, index them, and reassess where the site should rank. Early movement often shows up around three to six months in, and more meaningful changes in revenue or qualified traffic tend to appear between six and twelve months. A company that has agreed to one month of work has very little chance of showing anything an early stage client would recognize as success.
A minimum term protects the agency from being judged before its work has had a chance to take effect. It also lets the agency plan a roadmap instead of scrambling for something visible to point to each month. The trade off is that the minimum locks you in, so it is worth knowing what each length asks of you.
The spectrum of minimums
Month to month. Some agencies offer no minimum and let you cancel at any time. This gives you the most flexibility, which can matter if your budget is uncertain or you are testing whether the agency is a good fit. The risk is that month to month work can push an agency toward quick, visible activity rather than the slower foundational work that drives durable results, because it knows it is being evaluated every cycle.
Three months. A three month minimum is sometimes used as a starting term, after which the relationship continues month to month. It is also a reasonable fit for a defined project such as a technical audit and the implementation that follows. It is usually too short to judge the results of a broader ongoing campaign.
Six months. This is the minimum many companies treat as the realistic floor for ongoing SEO. It covers the period in which technical fixes land, new content gets indexed, and search engines begin to reassess the site. Six months gives the agency enough room to do foundational work and gives you enough time to see whether the campaign is moving in the right direction.
Twelve months. A twelve month minimum is common when the work is ambitious, the competition is strong, or the site is starting from a weak position. It gives a strategy time to mature rather than just begin. The cost is the longest commitment, so it should come with clear milestones you can check along the way.
Weighing a minimum against your need for flexibility
A longer minimum is not automatically a warning sign, and a short one is not automatically better. The question is whether the minimum matches the work and whether you have ways to hold the agency accountable inside that term.
Before agreeing to any minimum, ask what the agency expects to deliver during it. A six or twelve month term is easier to accept when it is paired with defined deliverables, regular reporting, and a written explanation of when different outcomes should start to appear. If the agency cannot describe what the first few months will produce, the length of the minimum is not the real problem.
Also separate the minimum from what happens after it. Many agreements move to month to month once the initial term ends, and most include a notice period for cancellation. A long minimum with a clear exit and steady reporting can be a safer arrangement than a short one with vague promises.
If you genuinely need flexibility, say so before signing. Some companies will offer a shorter starting term, a smaller initial scope, or a trial period. It is better to negotiate the minimum openly than to sign a term you are not confident you can keep.