A tumble bus (also sold as a gym bus or fun bus) usually costs roughly $64,000–$144,000 to start as a franchise, based on the investment ranges published in franchise directories for the Fun Bus brand. An independent start depends mostly on the vehicle: full-size used school buses are reported at $10,000–$60,000, with 10–12-year-old Type C buses commonly listed at $15,000–$30,000 — before equipment, insurance, and launch marketing. Reported earnings are modest: directory data for Fun Bus shows average yearly gross sales of $116,298 and owner-operator earnings of about $16,000–$21,000, while one established mobile gym (22 years in operation) listed for sale on BizQuest reports $121,000 in gross revenue and $50,000 in seller's discretionary earnings. All figures below are published estimates collected in October 2026 — they disagree between sources in places, and we show both sides rather than pick one.
What is a tumble bus or gym bus business?
A tumble bus is a school bus gutted and refitted as a mobile children's gym — typically with a balance beam, mini trampoline, rope climbing, rings, monkey bars, a ball pit, and sometimes a zip line that runs the length of the bus. The owner drives it to the customer: to daycares and preschools on weekdays and to private birthday parties on weekends. Operators sell it under many names — Tumble Bus, Gym Bus, Fun Bus, Giggle Bus, Kiddo Bus, Monkey Movers — but the model is the same: a staffed, supervised, mobile play space for children roughly ages 2–8. See our 2026 marketing statistics for mobile kids' party bus operators for market size and party pricing.
How much does it cost to start a tumble bus or gym bus business?
No public source we found itemizes the full build-out of an independent gym bus, so the table below combines the figures that are published — franchise investment ranges, used-bus prices, and bus insurance — and marks where a line item has to come from your own quotes.
| Cost component | Reported range | Source | Notes |
|---|---|---|---|
| Franchise fee (Fun Bus) | $34,000 – $39,500 | VettedBiz; other franchise directories | Listings disagree by edition: $34,000 in one, up to $39,500 in others. |
| Total franchise investment (Fun Bus) | $63,850 – $144,000 | VettedBiz | Another directory lists $95,650 – $117,900. Confirm against the current FDD (Item 7). |
| Used full-size school bus | $10,000 – $60,000 | BusesForSale.com | Typical 10–12-year-old Type C with 100,000–150,000 miles: $15,000–$30,000. |
| New Type C school bus (for comparison) | $127,000 – $150,000 | BusesForSale.com; CivicIQ (state contract data) | Not a typical gym-bus purchase; shown to explain why operators buy used. |
| Bus insurance (all bus types, per year) | $1,000 – $36,500 | Insurify | Very wide; a converted bus used as a stationary play space may be rated differently. Get broker quotes first. |
| Equipment, build-out, launch marketing, working capital | Not itemized publicly | — | Franchise totals imply roughly $24,000–$110,000 outside the franchise fee (total investment minus fee). |
Franchise vs independent: which costs less to start?
| Factor | Fun Bus franchise (reported) | Independent operator |
|---|---|---|
| Upfront fee | $34,000 – $39,500 | None |
| Ongoing fees | Royalty 6–7% and ad fee 2% of sales (listings differ) | None — but you fund your own marketing |
| Net worth / liquidity required | Net worth $200,000–$300,000 and liquid capital $15,000–$50,000 (listings differ) | Whatever your lender or savings allow |
| Brand and customer pipeline | Existing brand and territory model | You build the brand, website, reviews, and daycare relationships yourself |
| Time to launch | One listing cites 90–120 days | Depends on finding and converting a bus |
Independent operators exist across the U.S. and Canada — for example Tumble Bus in Houston, Giggle Bus in Conroe, Kiddo Bus, and Groovy Gym Bus in Toronto — so a franchise is not required. Existing businesses also come up for sale: BizQuest has listed a mobile fitness and entertainment business for children with a retrofitted school bus that had run for over 27 years, and a turnkey tumble trolley.
How much do tumble bus owners actually make?
- Fun Bus (franchise, reported by VettedBiz): average yearly gross sales of $116,298; estimated owner-operator earnings of $16,282–$20,934; payback period of 6.1–8.1 years. These are a directory's reported figures, not audited results.
- Established mobile gym listed for sale (BizQuest): gross revenue of $121,000 and seller's discretionary earnings of $50,000 after 22 years of operation with a refurbished full-size school bus serving daycares, preschools, camps, and birthday parties.
- Revenue mix: Fun Bus sells weekly classes to daycares and preschools plus birthday parties and events; Tumble Bus in Houston visits daycares and private preschools during the week and takes party bookings on weekends. Party revenue alone is only part of the picture.
To see what weekend parties alone could add, here is simple arithmetic — not a forecast. It assumes 40 booked weekends a year and shows annual party revenue before any costs. Published party prices range from about $125 to $520 depending on group size and length (see our pricing benchmarks).
| Bookings | At $150 per party | At $250 per party | At $350 per party |
|---|---|---|---|
| 1 party per weekend | $6,000 | $10,000 | $14,000 |
| 2 parties per weekend | $12,000 | $20,000 | $28,000 |
| 3 parties per weekend | $18,000 | $30,000 | $42,000 |
| 4 parties per weekend | $24,000 | $40,000 | $56,000 |
What are the hidden and ongoing costs?
- Insurance: commercial auto and general liability at minimum; the range for buses generally is very wide, so request quotes before you buy the bus.
- Vehicle upkeep and fuel: older school buses carry real maintenance costs. We found no reliable published per-year figure, so budget from a mechanic's inspection of the specific bus.
- Staff: classes and parties are typically run by two coaches or instructors, so payroll, background checks, and first-aid training belong in the budget.
- Licensing and registration: requirements for converted school buses vary by state — see our insurance and licensing checklist.
- Marketing: a website, Google Business Profile, and ads. See our Google Ads benchmarks by industry and the website audit of mobile kids' party businesses.
What does a customer cost to acquire?
LocaliQ's 2026 benchmarks put the average Google Ads cost per lead at $26.84 for Arts & Entertainment, $44.26 for Sports & Recreation, and $77.48 for Education & Instruction — the closest published categories for a kids' mobile gym. Cost per booked party is cost per lead divided by the share of leads that book. The table shows the result at three assumed booking rates.
| Category (LocaliQ 2026 CPL) | 20% of leads book | 33% of leads book | 50% of leads book |
|---|---|---|---|
| Arts & Entertainment ($26.84 per lead) | $134 | $81 | $54 |
| Sports & Recreation ($44.26 per lead) | $221 | $134 | $89 |
| Education & Instruction ($77.48 per lead) | $387 | $235 | $155 |
How can you reduce the risk before you buy?
- Read the disclosure document. Franchisors must provide a Franchise Disclosure Document before you sign; Item 7 lists estimated initial investment and Item 19 any financial performance claims. The FTC explains the rule in its Franchise Rule compliance guide.
- Compare against sale listings. Check asking prices and reported revenue on BizQuest and similar marketplaces for existing mobile gyms before paying a franchise fee.
- Get insurance quotes before buying the bus. The bus is the easy part; coverage for children's activities is the part that can change the math.
- Test demand first. Before you buy, ask local daycares and preschools whether they pay for weekly mobile classes and what they pay — weekday programs are a major part of how operators here earn.
*This page is informational and not financial, legal, or insurance advice. Figures are published estimates from third-party directories and listings, collected in October 2026; they change and sometimes conflict. Verify every number with the seller, the franchisor's current FDD, and your own quotes.*
Want help applying this to your own tumble bus or mobile gym business? MIS Services Inc offers a free 30-minute marketing audit — we review your search visibility, website, and reviews, and show you what to fix first. No obligation.
Primary Sources
- VettedBiz — Fun Bus Franchise — VettedBiz
- Fun Bus — official website — Fun Bus
- BizQuest — mobile fitness and entertainment for children (listing) — BizQuest
- BizQuest — 22 years of a fun business (listing) — BizQuest
- BusesForSale.com — How much does a school bus cost — BusesForSale.com
- CivicIQ — What districts pay for school buses — CivicIQ
- Insurify — Bus insurance coverage options and costs — Insurify
- LocaliQ — 2026 Search Advertising Benchmarks — LocaliQ
- Houston Chronicle — Get on the party bus (Tumble Bus Houston) — Houston Chronicle
- FTC — Franchise Rule compliance guide — Federal Trade Commission