How to build a campus classifieds website students use every semester.

One campus has its own economy, and it turns over every year.

A campus is a town that empties and refills on a schedule. Thousands of students arrive in August needing a desk lamp, a mini fridge and a bike, and leave in May with the same things and nowhere to put them. Every year a new class buys what the last one sold. Few other markets are this predictable.

General marketplaces serve students poorly. A search near campus returns listings from across the city, sellers who want a car ride away, and nothing filtered by course, dorm or pickup on campus. Students want to buy from someone they can meet between classes.

Who uses it

• Students buying and selling books, furniture, electronics, bikes and tickets to campus events.
• Graduating seniors clearing out a whole apartment in one week.
• International students, who arrive with two suitcases and need to furnish a room fast.
• Local businesses near campus: bike shops, pizza places, storage units and landlords.

Where the trade happens today

Class-year Facebook groups, the campus subreddit, group chats, dorm bulletin boards and the free piles that appear outside residence halls in May. Some campuses run a move-out donation drive. All of these are busy for two weeks and useless the rest of the year, and none of them can be searched for a course code.

Start with one campus you know well: its dorms, its course codes and its calendar.

Keep students free, and charge the businesses that want them.

Students will not pay to post a used lamp, and you should not ask them to. A campus board earns its money from the businesses and landlords who want a student audience and find it hard to reach.

Landlords near campus advertise every year and already pay for listings elsewhere, so sublets and rentals from landlords are the first paid category to consider. Pizza places, bike shops, storage companies and phone repair shops want to be seen during move-in week. Storage is a natural fit for move-out: students need somewhere to keep things over summer, and storage firms want them as customers.

Student services are a second source later. A tutor or a student photographer who posts every semester may pay to feature their listing at the start of term.

Watch the calendar. The board is busiest in the first and last weeks of each semester, so time any paid feature to those weeks.

Sell move-in and move-out week banners to local businesses before you sell anything to students.

Launch at move-out, then catch the new class at move-in.

A campus board has two launch windows. Move-out week in spring gives you sellers and stock. Move-in week in late summer gives you buyers. The best plan uses both: fill the site in May, keep it alive over summer with sublets and storage, and promote it hard in August.

Partners worth asking

• Student government, which often wants a student resale board and can share it.
• Resident advisors and residence hall councils.
• The sustainability or move-out donation team.
• The international student office, which welcomes new arrivals who need everything at once.
• The student newspaper and campus radio.

Launch checklist

• Campus areas and dorm zones set up as locations.
• Textbooks for the largest first-year courses listed by course code.
• At least 100 real listings across books, dorm items and bikes.
• Posting rules with the banned items list, a sublet safety page and meeting advice.
• A home page headline that names the campus, without the school's logo.
• Flyers with a QR code in dorm lobbies, the library and the student union, where allowed.

A worked example: Hill and Lake Student Exchange, Ithaca, New York.

Hill and Lake Student Exchange is a fictional board for students at one university in Ithaca, New York, made up to show how a campus site comes together. Ithaca is a good test case: the campus sits on a steep hill, many students have no car, winters are long, and the town fills and empties with the academic year. The board serves undergraduates in the dorms, graduate students in apartments down the hill, and the landlords and shops that depend on them.

Categories

• Textbooks and course materials
  • By department
  • Calculators and lab kits
• Dorm and apartment
  • Fridges and microwaves
  • Desks, chairs and lamps
• Bikes and winter gear
• Sublets and roommates
• Rides
• Student services

How it started

Two juniors, one in computer science and one in environmental studies, watched the curbs outside the dorms fill with usable furniture every May and the same items get bought new at a big-box store every August. In March they asked the sustainability office whether it would mention a resale board in its move-out emails, and it agreed to share the link without endorsing the site. They spent April collecting listings from seniors in their own buildings, one whole room at a time, and set the pickup spots as campus areas: north campus, west campus, the main library and the streets just below campus.

By the last day of finals the board had several hundred listings, and the August arrivals found mini fridges and desks already waiting. Winter gear became an unexpected category: students from warmer places buy boots and parkas from seniors who are leaving for good. Rides home at Thanksgiving and spring break fill up the week before each break, mostly with students heading to the same few cities.

How it makes money

Students never pay to post. Landlords pay to post in Sublets and rentals, and two storage companies buy the move-out banner every spring. A bike shop and a pizza place take the move-in banner in late August. Tutors can feature a listing in the first two weeks of each semester. The founders treat the income as a way to cover costs and pay a student moderator during the busy weeks, and they have already picked two sophomores to take over when they graduate. Next year they want to add a page for each big first-year course, built from the course codes students actually search.

The first 90 days: from spring break to the end of finals.

The campus calendar sets the plan. Count back twelve weeks from the last day of spring finals, and you land around the start of spring semester. That leaves time to set up, collect listings during the term and be ready when move-out turns every dorm into a yard sale.

Two rules shape the weeks. First, get the people who already have the students' attention on your side early: resident advisors, the sustainability office and the student government. Second, collect stock before you collect buyers. Seniors with a room to clear are the supply, and next year's first-year students are the demand, so the plan fills the site in spring and leaves the big buyer push for August.

If you start in the fall instead, the same steps work with the end of fall semester as the target, though December is a smaller move-out than May. Students who study abroad, graduate early or switch housing still sell in December, so the steps are the same, only the numbers are smaller. Use the fall run as a rehearsal for the bigger spring week. Note which dorms posted most, which flyers people mentioned and which questions sellers asked, and fix the posting form before May.

Three ways to build a campus board, and the one problem they all face.

Campus boards are often started by students, and the risk every route shares is graduation. A site that depends on one person who leaves in four years needs to be easy to hand over.

Coding it yourself or with classmates is tempting for a computer science student, and it makes a fine portfolio project. The trouble comes later: the code lives in one person's head, and features like course code search, moderation queues, spam filtering and email alerts take months to build properly. Many student-built boards stop when their author takes an internship.

Installing a classifieds script or a WordPress plugin on a rented server is cheaper and quicker than coding from scratch. You still own the updates, the backups and the spam, and spam hits campus boards hard because scammers target students. Plan who will patch the server during finals week, when nobody has time. Write the steps down, because the student who set up the server may be abroad for a semester when it needs attention.

A hosted builder handles the hosting and updates, and you set up course code fields, pickup spots and moderation in a control panel. Handing it over is a matter of adding the next student as an admin. You give up control over the code, which matters only if you want features no builder offers.

Whatever you choose, check how it handles a rush. Move-out week can bring more posts in a few days than the rest of the semester, and a slow or broken site that week costs you a year. Ask any provider or developer what happens when a few hundred students post on the same evening, and test it yourself with friends before the real rush.

What a campus classifieds site costs to run.

The software is the smallest part of the bill. Most of the cost is your time in the first months: finding the first listings, answering questions and checking what gets posted.

A campus board's extra costs are small: printed flyers and posters for dorms and the student union, and perhaps a table at an orientation fair or club fair if the school charges outside groups for one.

Mistakes that empty a campus board.

• Launching in September. By the time classes start, last year's seniors have gone and their furniture has gone to the curb. Fill the site at the end of spring, when seniors are selling, and promote it in August to the students who are buying.
• Building it around one founder. If only you know the admin login, the board dies the year you graduate. Recruit two younger students in your second year and give them real roles, such as moderating sublets or running the move-in push.
• Letting textbook listings go stale. A professor changes the required edition, and twenty listings for the old one become useless. Refresh the pages for big courses every term, and ask sellers to say which semester they took the course. Before each term, check the bookstore's list for the ten biggest courses and mark the outdated listings.
• Asking students to pay. Even a small posting fee sends students straight back to the class group chat. Keep them free and earn from landlords, storage firms and local shops.
• Leaving tickets unchecked. One sold-out game where three buyers paid for the same seat will travel around campus in a day. Approve ticket listings by hand, and warn buyers to pay only when they can see the ticket transferred.
• No standard meeting spots. When every deal ends with a stranger at a dorm room door, something will go wrong. Set pickup spots in public places, such as the library entrance or the student union, and make them the locations sellers choose from.
• Covering five campuses at once. A city with several colleges looks like a bigger market, but each campus has its own calendar, course codes and slang. Fill one, then add the next with its own locations and pages.
• Forgetting the people who are not students. Parents buy for their children before move-in, international students shop from abroad, and graduate students rent all year. Write a page for each group, and they will find you through search.
• Asking too much at posting time. A student between two lectures will not fill in twelve fields to sell a lamp. Require a photo, a price and a pickup spot everywhere, add course code and edition only in Textbooks, and leave the rest optional.
• Ignoring the free piles. In the last days of move-out, students give away more than they sell, and that is when a board earns goodwill. Add a free category, ask sellers to post what they will leave at the curb, and the new class will remember who furnished their room for nothing.

Campus terms a founder should know.

Students, landlords and bookstores use these terms, and listings make more sense when the board uses them correctly.