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A family of 6 chartering a 51m Heesen in the Mediterranean shoulder season in 2026 pays a $420K base weekly rate, $126K APA at 30%, $84K VAT at 20%, and roughly $50K in gratuity. That is $680K all-in for the trip. The kid-specific extras then add another $18K to $42K, none of which appear in the original broker quote. Most families discover them on day three or day four of the charter, after the chief stewardess raises them politely over breakfast.
This is the line-item teardown. Two children under 10 on a 50m to 60m yacht in the Mediterranean. We use 2026 rates pulled from inventory at four central agents in late April. We name the extras that are negotiable in advance and the ones that are not.
The line items, in the order they hit the bill
Nanny berth and access protocol: $0 to $9K added
If you are bringing a nanny, the yacht needs to assign a berth. On a 6-cabin yacht being chartered at full guest capacity, the only options are a guest cabin (counted against the 12-guest cap, so usable only if your party is 11 or fewer), a converted crew bunk in the lower deck (some yachts allow this, some do not, MCA charter classification can complicate it), or the nanny shares a twin guest cabin with one of the children. None of these is free. A reassigned crew bunk usually costs $0 in the contract but takes a crew member off rotation, which the captain may quietly resist. A repurposed guest cabin counts toward your 12-guest cap. The clean option is to book a yacht with a dedicated nanny cabin, which is standard on most 60m+ yachts and on a handful of 50m+ recent builds.
Cot, child seat, high chair, baby gates: $200 to $900 per item
Standard charter inventory includes one cot, one high chair, and zero baby gates. Anything beyond that, the chief stew sources from a Monaco or Antibes hire firm at retail. Two cots, a second high chair, two car seats for tender shore-runs and one baby gate to close off the helideck stairs runs around $1,200 to $2,200 across a 7-day Med charter. Pre-warn the broker 14 days out and the chief stew can sometimes source these from a local rental partner at 60% of the per-item retail.
Child-specific catering provisioning: $1,500 to $4,000 added APA
The chef will not buy a separate kid-friendly inventory unless asked. The default Med charter provisioning is built around adult tastes: cured meats, anchovies, raw fish, herb-heavy sauces, a strong cheese line. Two children under 10 typically need a separate kit: white pasta, plain proteins, branded breakfast cereals, fresh-cut fruit done four times a day, child-portion ice cream, the specific yogurt brand they trust. Provisioning at Med supermarkets for two kids over a week runs $1,500 to $2,500 at sensible spend, more if the chef is sourcing organic-only at the marina alimentari rates. Add another $1,000 to $1,500 if you want imported brands flown in, which the chief stew can arrange but will quietly mark up.
Children's water toys and scaled equipment: $2,000 to $6,000 added APA
Charter water-toy inventory is built for adult use. Standard fleet on a 50m to 60m yacht: one or two Seabobs, two stand-up paddleboards, two kayaks, an inflatable slide, a Jet Surf or Yamaha JetBlaster, four sets of snorkelling gear in adult sizes. Children need scaled equivalents. Kid-sized PFDs that fit a 3-year-old and a 7-year-old, child snorkel sets, fins in small sizes, a smaller paddleboard, an inflatable trampoline if the yacht does not carry one, and arm floats for non-swimmers. The chief stew sources this. Some yachts subsidise it from a baseline kit. Others charge through APA. Expect $2,000 to $6,000 added depending on what the yacht already carries.
Pediatric medical kit and on-call cover: $1,200 to $4,500 added
The standard yacht medical kit, certified for the charter classification, is built around adult dosing. For children, the kit needs paracetamol and ibuprofen in pediatric concentrations, anti-nausea options dosed for under-12s, antihistamines in liquid form, an aerochamber for an inhaler, and a pediatric-rated AED pad set. The chief stew can update the kit for around $400 to $700 in supplies. The bigger cost is on-call pediatric cover, which the captain can subscribe through MedAire or a regional equivalent for around $1,200 to $3,800 for a 7-day window depending on cruising ground. We strongly recommend this and we have seen brokers leave it off the quote routinely.
Tender and toy fuel pass-through: $1,500 to $4,000 added APA
Kids on a charter use the tender more than adults. The chief stew runs the tender three to five times a day on a family week: morning beach, late morning lunch shore-run, afternoon ice cream run, evening shore-run for the parents, late ferry back for the kids with the nanny. Tender fuel is invoiced through APA. On a 7-day Med charter, expect $1,500 to $2,500 in tender fuel for a family week, against $800 to $1,200 for an adults-only week. Add another $500 to $1,500 if a Jet Surf or jet ski is in heavy use.
Crew gratuity uplift: $0 to $4,000 added
This one is not on the quote because gratuity is calculated on the base, not on extras. But a chief stew running cot setup, twice-daily child-tailored meals, kid-specific water-toy rigging, and the nanny-coordination role earns a higher informal weighting at gratuity distribution time. Many families add an extra $2,000 to $4,000 to the gratuity envelope at the end of a kid-heavy week and address it to the chief stew specifically. We have never seen a chief stew refuse this. We have seen many earn it.
School-week or term-time supplement: $0
Not a real cost, but worth mentioning: some operators have floated school-week supplements during charter peak. None we have seen has stuck. If a broker quotes you a "term-time premium" or "school holiday premium" on a yacht that has standard MYBA pricing, ask why. The MYBA published rate is the published rate. Date-specific surcharges show up only on Christmas, New Year, and the Monaco Grand Prix week, and they are disclosed up-front.
Total kid-specific cost, summed
For a family of 6 with two children under 10 on a 50m to 60m Med charter, the kid-specific extras land at $18K to $42K over a 7-day week. The low end assumes the yacht already carries a strong child kit, the cruising ground does not require imported provisioning, no nanny berth is needed because the headcount is 11 or fewer, and the family declines pediatric on-call cover. The high end assumes a remote cruising ground (the Aeolian islands or Corsica north coast), a nanny berthed in a repurposed guest cabin, a full child-water-toy refit by the chief stew, imported provisioning flown in, and full pediatric MedAire cover.
For a 70m-plus yacht, the per-item costs are similar but the yacht typically carries a stronger child kit already and the nanny berth is part of the standard layout. Total extras on a 70m+ tend to land $14K to $30K for the same family configuration.
What we passed on
Pre-bundled "family package" pricing from third-party platforms. Several platforms market a "family extras package" at a fixed $4,500 or $6,000 on top of the charter. We have seen them. The bundled package replaces line items that would have cost $2,500 to $3,200 if booked through the chief stew directly. The package's mark-up is structural and does not improve service.
Yachts marketed as "kid-friendly" without a dedicated nanny cabin. Brokers will tell you the yacht is great for families. The test is the layout drawing. If the yacht does not have a dedicated nanny cabin in the layout, the nanny is going into a guest cabin (against your 12-guest cap) or a converted crew bunk (against crew rotation). Both work. Neither is friction-free. Ask for the layout drawing and look for the cabin labelled "staff" or "nanny" with its own head and a corridor connection to the guest level.
The "free kids menu" upsell. A few central agents have pitched a "complimentary kids menu" as a charter inclusion. The kids menu is part of the chef's job and always has been. If it is being marketed as a free upgrade, the base rate already absorbed the cost. It is not a discount.
What to negotiate up-front
The broker quote should list, at minimum, the nanny berth arrangement, the child water-toy add-ons, pediatric medical cover, and an indicative tender-fuel uplift for a family week. None of these is contentious. All of these are routinely omitted. Push for them in writing before you sign the MYBA contract. The cost will be similar. The surprise factor will not.
FAQ
Q: Are children counted against the 12-guest charter cap? A: Yes. The 12-guest cap is a flag-state regulation tied to the yacht's commercial charter classification. Children of any age count as guests. If you have 10 adults and 3 children, you are above the cap and the captain will refuse to depart. A licensed nanny in a crew rotation slot does not count, but a parent's nanny berthed in a guest cabin does.
Q: Do we need to bring our own car seats for tender shore-runs? A: Most tenders do not have anchor points for fitted child seats, so the answer is usually no. For shore taxis or pre-arranged airport transfers in the cruising ground, the chief stew can pre-arrange car seats with the local taxi or chauffeur service. Confirm 7 days before charter starts.
Q: Can the yacht refuse to take a child under 2? A: Yes, in some flag states, and on some specific yachts. Cayman Red Ensign yachts can typically charter to families with infants. A small number of MCA-classed sailing yachts have a minimum age of 5. Ask before signing.
Q: Is the pediatric medical cover really worth $3,800? A: For a family with no chronic medical needs, in a coastal Med cruising ground with hospital access at every overnight stop, the answer is debatable. For a family with any standing pediatric concern, or a remote cruising ground (south coast Sicily, north Corsica, the Tyrrhenian islands), the answer is yes. The cost is roughly 0.5% of the charter all-in. The value is in the medevac coordination if you ever need it.