Every sales manager has been there. You spend a week building a territory plan, the spreadsheet looks clean, the accounts are evenly distributed, the revenue targets feel achievable. Then Q1 starts and three months later you're looking at a plan that bears almost no resemblance to reality.
Territory planning isn't hard because the strategy is complicated. It's hard because the map is not the territory, and most plans are built on assumptions that don't survive contact with the field.
Start with drive time, not account count
The most common mistake in territory design is treating accounts like points on a map and distributing them evenly by count. What you actually need to distribute evenly is time. Specifically, the time a rep can spend in front of customers.
Two territories can have the same number of accounts and wildly different effective capacities. A territory with forty accounts in a dense urban grid might take less drive time than a territory with twenty-five accounts spread across a rural region. Build your territories around sustainable drive time first, then see how many accounts fit.
As a rough benchmark: most field reps can realistically visit four to six customers per day when you account for drive time, meeting time, and the admin that happens between. Work backwards from there.
Segment your accounts by actual potential, not revenue history
Territory plans that allocate accounts based only on current revenue perpetuate the status quo. The customer who's been spending £5,000 a year for five years might have a theoretical ceiling of £50,000. Or they might be fully penetrated. You need to know which one before you decide how much of a rep's time that account deserves.
Build a simple potential score: industry, company size, number of relevant sites or locations, and any intelligence about expansion plans or competitive dissatisfaction. Accounts with high potential and low current revenue deserve disproportionate attention. They're where the growth is.
Build in slack for prospecting
Most territory plans fill reps to 100% capacity with existing accounts. This is a mistake. Without dedicated prospecting time, the pipeline stagnates as existing accounts churn naturally over time.
Reserve twenty to thirty percent of each rep's weekly capacity for prospecting new accounts within their territory. Protect it actively: the temptation to fill that time with "just one more customer visit" is always there, and it needs to be resisted.
Define coverage tiers and be explicit about them
Not every account in a territory gets the same treatment, and pretending otherwise sets everyone up for failure. Define three or four coverage tiers explicitly:
- Strategic accounts: monthly visits minimum, named rep ownership, executive engagement
- Core accounts: quarterly visits, regular check-ins, renewal tracking
- Maintenance accounts: biannual visits or as-needed, primarily reactive
- Prospects: active outreach cadence, defined conversion criteria
Once you have these tiers, your territory plan becomes a resource allocation problem you can actually solve. Sum up the time required to service each tier across all accounts in a territory and compare it to a rep's available capacity. If it doesn't fit, you either need to move accounts, adjust coverage frequency, or add headcount.
Review quarterly, not annually
Territory plans reviewed once a year are out of date for eleven months. Markets shift, reps leave, large accounts get acquired, new prospects emerge in unexpected places. A quarterly territory review (even a light one) lets you course-correct before a mismatch becomes a performance problem.
Get your reps into the planning process
The best territory intelligence you have is sitting in the heads of the people doing the job. Your reps know which accounts are expanding, which are genuinely at risk, which neighbours of existing customers look promising, and where the hidden gems are.
Build a simple input process (even just a structured conversation) where reps contribute their field intelligence before each quarter's planning cycle. The plans that come out of this are better, and the reps who contributed to them feel ownership over the outcomes rather than resentment at the assignments.
Territory planning done right is less about perfect allocation and more about building a shared understanding of where the team's time goes. Get that right and the rest tends to follow.