What I would actually book
A standard Deluxe Balcony is the sensible default for most couples on either ship — roughly 200 to 235 sq. ft. depending on which source’s measurement you trust (we flag that conflict below). Families and anyone wanting more sitting-area space should price a Mini-Suite before assuming they need a full Sanctuary Collection suite. And if you’re comparing this class to an older Princess ship, know upfront that the top-tier product here is called Sanctuary Collection, not Reserve Collection — the two aren’t the same program, even though they serve the same role.
Deluxe Balcony
Roughly 200–235 sq. ft. depending on source — see the balcony cabins section for why that range is wide.
Mini-Suite
Roughly 267–305 sq. ft., a sitting area and more of the "suite feel" without full Sanctuary Collection pricing.
Signature Sky Suite, aft Deck 16
A two-bedroom, ~1,260 sq. ft. suite sleeping up to 5 — only 4 exist per ship.
Sanctuary Collection, not Reserve Collection
This class’s own top-tier program — every other Princess ship uses Reserve Collection instead.
Motion-sensor nightstand lights
Sensitive enough that guests on both ships report blocking them with a towel or pillow at night — see the inside cabins section.
Cabins over the Piazza, laundry-adjacent cabins, and forward Deck 16–17 near The Dome
The most consistently documented location patterns on this class — see the location section below.
True sisters, with venue-level differences only
The underlying stateroom architecture is shared — same category ladder, same Sanctuary Collection structure, and no source we found documents an actual deck-plan or cabin-numbering difference between the two ships. What separates them is public-space design, not staterooms.
Sun Princess (2024)
The class’s debut ship, and the one with more review history to draw on. Launched under Reserve Collection branding before the October 2024 Sanctuary Collection rebrand. Her original Park19 top-deck attractions (a hang-gliding ride and climbing structure) never received final certification and were removed in July 2024 — worth knowing if an older article or photo still shows them.
Star Princess (2025)
The newer sister, launched with Sanctuary Collection branding from day one — she never carried the Reserve Collection name. Adds a separate non-smoking casino section, a larger O’Malley’s Irish Pub, and an expanded top-deck sports area reflecting lessons learned from Sun Princess’s launch. Princess has not announced any acoustic changes to the Piazza atrium despite noise complaints on Sun Princess, so treat that specific complaint as applying equally to both ships.
Everything else
Treat both ships as running the same cabin logic below. The category-by-category strategy applies to either — the ship pages carry each ship’s own noise-pattern research and any ship-specific detail worth knowing.
Interior → Oceanview → Cove/Deluxe Balcony → Mini-Suite → Sanctuary Collection Suites
Princess doesn’t organize its ladder the way Disney or NCL does. There’s no numbered or lettered category code as the primary identity — Princess sells by named tier (Interior, Oceanview, Balcony, Mini-Suite, Suite), with individual cabin grades lettered underneath each tier on the deck plan. The suite tier on this class runs four named grades under the Sanctuary Collection umbrella, all sharing one dedicated deck, restaurant and lounge — genuinely more of a Haven- or Concierge-style walled-off product than the "top of one ladder" structure we found on Disney.
The categories that drive the buying decision
This is a decision map, not a ship-specific dimension table — treat the figures as consistent across both ships unless a ship page says otherwise. Square footage varies more between third-party sources on this class than we’d like, likely because both ships are still relatively new and not every database has fully settled its numbers yet — we use the middle of the reported range and flag any wider gap in the notes column.
| Family | Category | Approx. size | Deck(s) | Notes |
|---|---|---|---|---|
| Interior | Interior (IA–IF, IS) | ~135–145 sq. ft. | 5–17 | No window — 460 cabins per ship, the largest single category |
| Oceanview | Premium Oceanview (O2, O3, O5) | ~212–215 sq. ft. | 5, 6, 10, 11 | Window, no balcony — 186 per ship |
| Balcony | Cove Balcony (DG, DH) | ~200 sq. ft. | 6, midship | Lower, more recessed balcony position — 100 per ship; see balconies section |
| Balcony | Deluxe Balcony (D1, D2, DA–DF) | ~200–235 sq. ft. (sources conflict) | 9–17 | 949 per ship — the single largest balcony category |
| Mini-Suite | Mini-Suite (M1, M2, MA, MD/ME) | ~267–305 sq. ft. | 10–17 | 243 per ship; 123 of these are Sanctuary Mini-Suites — see the Sanctuary Collection section |
| Mini-Suite | Cabana Mini-Suite (C1, C2, CA, CB) | ~267–330 sq. ft. incl. private cabana | 9–12 | 146 per ship — a mini-suite with a semi-private deck cabana attached |
| Suite | Signature Suite (S9) | ~267–304 sq. ft. | 11, 14, 15, 16 | 30 per ship — the entry tier of the Sanctuary Collection suite ladder |
| Suite | Signature Grand or Vista Suite (S4) | ~305–635 sq. ft. | 15, 16, 17 | 36 per ship — see the naming hedge in the Sanctuary Collection section |
| Suite | Signature Grand or Vista Suite (S2) | ~564–565 sq. ft. | 10, 16 | 10 per ship — see the naming hedge in the Sanctuary Collection section |
| Suite | Signature Sky Suite (SO) | ~1,260 sq. ft. | 16, aft | Two-bedroom, sleeps up to 5 — only 4 exist per ship, the largest cabin on the ship |
Reported totals split between 2,157 and 2,162 per ship depending on the source, with one outlier figure (2,237) that doesn’t reconcile with either and looks stale or miscategorized. We couldn’t resolve this to one figure without a live, authoritative Princess-published total — treat either 2,157 or 2,162 as the right ballpark, not a precise count.
The value baseline — and a real design quirk to know before you pack
Interior cabins run roughly 135–145 sq. ft. and, unlike Disney’s Magical Porthole ships, carry no video-screen or virtual-window feature on this class — genuinely windowless. Independently of category, though, there’s a cabin-design detail worth knowing regardless of what you book: the motion-sensor nightstand reading lights on this class are sensitive enough that multiple, unrelated guest accounts on both Sun Princess and Star Princess describe them triggering on any nighttime movement, bright enough to disrupt sleep, with guests resorting to covering them with a towel, pillow or tape. This is a class-wide hardware trait, not an Interior-specific one, but it’s worth knowing before your first night regardless of category.
Skip straight to Premium Oceanview or a balcony category rather than assuming any Interior cabin has a consolation feature — it doesn’t, on this class.
Worth pricing, in a genuinely limited category
Premium Oceanview cabins run roughly 212–215 sq. ft. across Decks 5, 6, 10 and 11 — a window, no private outdoor space. At 186 cabins per ship, this is one of the smaller categories on the ship relative to the 949-cabin Deluxe Balcony tier, so expect less flexibility on sailing date and exact cabin position if a window-only room is specifically what you want.
If daylight matters more than private outdoor space, Premium Oceanview is the cheaper way to get it — just don’t expect the same breadth of cabin choice you’d get shopping the much larger Deluxe Balcony category.
The class default, plus a lower-positioned variant worth understanding
Deluxe Balcony is the standard private-outdoor-space category on this class, and the single largest category on the ship at 949 cabins per ship — but its exact square footage is one of the more unsettled figures in our research: sources range from 200 to 236 sq. ft., including one guest’s own in-cabin measurement that came in around 235–236 sq. ft., closer to the higher end of that range than the lower figure some cabin databases list. We present the range rather than picking one number to state as fact. Cove Balcony (Deck 6 midship, 100 cabins per ship) is the other balcony product on this class — a lower, more recessed balcony position than the standard Deluxe Balcony, consistent with a Cruise Critic member review of Star Princess describing the ocean as "a good ten feet away" with a walkway visible along the ship’s length below.
If an unobstructed, close-to-the-water balcony view is the reason you’re booking a balcony cabin at all, price Deluxe Balcony specifically rather than assuming Cove Balcony delivers the same experience for less — the lower, recessed position is a real trade-off, not just a price difference.
A genuine step up, including a version with its own cabana
Mini-Suite runs roughly 267–305 sq. ft. across Decks 10 through 17, adding a sitting area and — per Princess’s own category description — "many suite benefits" without full suite pricing. Cabana Mini-Suite (Decks 9–12) is this class’s own twist on the category: the same general size range, plus a semi-private deck cabana attached to the room, at 146 cabins per ship. Worth knowing before you book either: 123 of the 243 standard Mini-Suites on each ship are specifically Sanctuary Mini-Suites, meaning they carry Sanctuary Collection perks (see the next section) even though they’re priced and categorized as mini-suites rather than full suites — a way into the top-tier program without suite pricing.
A standard Mini-Suite
The sitting-area upgrade over a balcony cabin, at a fare below the suite tiers — price this before assuming you need a full suite.
A Sanctuary Mini-Suite specifically
The same physical footprint as a standard Mini-Suite, but bundled into the Sanctuary Collection program — worth confirming which specific cabins carry this designation before booking if the Sanctuary perks are the reason you’re shopping this category.
A Cabana Mini-Suite
The same category tier, plus a semi-private deck cabana — a different amenity, not just a size difference, worth pricing on its own terms.
Four suite grades, one dedicated deck, and a naming ambiguity worth flagging
Sanctuary Collection is this class’s suite-tier program — the equivalent role to Disney’s Concierge or NCL’s Haven, but structured as its own named brand rather than simply the top of one numbered ladder. It covers three tiers of accommodation: the 80 Signature Collection Suites proper (broken into four named grades below), the 123 Sanctuary Mini-Suites described above, and 12 Premium Deluxe Balcony cabins (category D0). All Sanctuary guests get the Princess Premier package bundled in (specialty and casual dining, a premium beverage package, shore-excursion credit, reserved theater seating, upgraded Wi-Fi, gratuities and more), plus access to the adults-only Sanctuary Club retreat deck with its own pool, hot tubs and private cabanas, and a dedicated Sanctuary Restaurant. Suite guests specifically also get a personal Suite Experience Manager, priority tender disembarkation, an in-suite Lavazza coffee machine, and a two-story Suite Lounge.
Princess’s own current suite page names four Sanctuary Collection grades — Signature Sky Suite, Signature Grand Suite, Signature Vista Suite and Signature Suite — but several respected third-party cabin databases and pre-launch press coverage instead label the same physical suites "Owner’s Suite" and "Penthouse Suite." The unit counts and sizes reconcile cleanly (30 + 36 + 10 + 4 = 80), so this looks like informal or legacy naming drift rather than two different physical products — but no single source we checked definitively maps which exact size tier (the 36-cabin S4 grade or the 10-cabin S2 grade) is officially "Grand" versus "Vista." We treat princess.com’s live page as the authoritative naming and flag the ambiguity here rather than asserting a pairing we can’t confirm.
When the Signature Sky Suite earns the premium
You want the single largest room on the ship — a two-bedroom, ~1,260 sq. ft. suite sleeping up to 5, aft on Deck 16 — and you’re booking early enough to get one of only 4 that exist per ship.
When a Signature Suite (the entry grade) is the smarter buy
You want genuine Sanctuary Collection access — the restaurant, lounge, Sanctuary Club and Princess Premier bundle — without paying for the largest physical suites. At 30 per ship, this is the most available of the four suite grades.
An estimated figure — Princess hasn’t published an authoritative per-ship count
This is the weakest-sourced area of this guide, and we’d rather say so than invent precision. Princess’s general accessibility page describes two categories fleet-wide — Fully Accessible Staterooms (roll-in showers, wider doorways, grab bars, distress alarms) and Ambulatory Accessible Cabins (steps into the bathroom or onto the balcony, narrower doors) — but gives no per-ship counts. Princess’s own per-ship accessible-route pages for both Sun and Star Princess showed only placeholder "coming soon" content as of this research, unlike several older Princess ships, which do have live accessible-route documents. Third-party sources put the figure at roughly 55 cabins per ship (one cites 56), with a rough breakdown of 14 suites, 22 deluxe balcony, 6 oceanview and 13 interior cabins across Decks 5 through 16 — but none of these figures trace back to a Princess-published document we could verify directly.
Confirm the exact accessible cabin number, category and door width directly with Princess or a travel advisor well ahead of your sailing — this is a case where we could not find an authoritative, Princess-published per-ship count to anchor to, only third-party estimates.
What sits above, below and next door matters as much as the deck
A few location patterns apply across the class on either ship — none are reasons to avoid a category outright, but they’re worth checking on the current deck plan before booking a specific cabin.
Cabins directly above the three-level Piazza atrium (Decks 10–11 midship)
The most discussed location concern on this class — a dedicated cruise-forum thread specifically warns against booking here, though no poster in it reported confirmed firsthand noise damage, so treat this as informed caution rather than a documented pattern.
Cabins near laundry rooms
Several specific cabin numbers are independently corroborated across more than one source as sharing a wall with a laundry facility — see each ship page for the specific numbers.
Forward Deck 16–17 cabins, near The Dome
The Dome runs as a late-night disco until roughly 1:30am — cabins nearby are worth avoiding for light sleepers. Princess has not announced any acoustic changes between the two ships despite this being a known complaint.
Cabins directly beneath the pool deck
Early-morning deck-chair and setup noise, consistent with the pattern on any ship this size — see each ship page for specific documented cabin ranges.
On this class, the Piazza and The Dome are the two features to plan location around.
Both venues are open, multi-deck spaces by design — atmosphere over soundproofing — and the noise pattern that follows from that design choice is consistently documented on both ships. Ask specifically about your cabin’s position relative to either one before booking if you’re a light sleeper.
What does the next dollar actually buy?
A real window — this class has no video-screen consolation feature, so this jump buys genuine daylight, not a virtual substitute.
Private outdoor space — the single most-felt upgrade on either ship for most travelers. Price Deluxe Balcony over Cove Balcony if an unobstructed, close-to-the-rail view specifically is the point.
A genuine sitting-area upgrade, and — if it’s a Sanctuary Mini-Suite specifically — a way into Sanctuary Collection perks without full suite pricing.
The real jump on this class: a dedicated restaurant and lounge, the adults-only Sanctuary Club deck, and the Princess Premier package bundled in — a different product from anything below it.
Each step up trades the entry Sanctuary Collection tier for more scale, ending in the two-bedroom Signature Sky Suite — price all of them before assuming higher always means better for your trip.
Match the strategy to the traveler
Solo traveler
Princess does not sell a discounted solo-occupancy category on this class — budget a standard category at the single-supplement rate, the same as most mainstream lines.
Couple
Start with a standard Deluxe Balcony. Make Sanctuary Collection prove its value against the fare gap before paying for the suite-only restaurant and lounge.
Family
Price a Mini-Suite — or specifically a Sanctuary Mini-Suite if the Sanctuary Club and Princess Premier bundle matter to you — before assuming a full suite is necessary.
Light sleeper
Avoid cabins directly above the Piazza atrium and forward Deck 16–17 cabins near The Dome, and pack something to cover the motion-sensor nightstand light regardless of category.
Suite-first traveler
Four distinct Sanctuary Collection grades exist, not one — decide between the entry Signature Suite and the two-bedroom Signature Sky Suite before you shop by price alone, and expect some naming ambiguity between "Grand" and "Vista" branding across sources.
View-first traveler
Price Deluxe Balcony specifically rather than Cove Balcony if an unobstructed, close-to-the-water view is the actual priority — Cove’s lower, recessed position isn’t just a discount, it’s a different vantage point.
Turn the cabin premium into a daily number
Use the Seabound Cruise Value Calculator alongside this guide: the cabin framework above gives you the facts, the price gap tells you whether the next category up is worth buying.
Seabound Cruise Value Calculator
Open the value tool and apply it to the cabin premium in front of you.
The class guide gets you close. These finish the decision.
Each ship page carries its own confirmed launch history, location-specific noise research, and (where they differ) venue-level detail — so this master page never has to fake one dataset that fits both ships identically.
Sphere Class cabin questions
What is the best cabin on a Sphere-class ship?
For most couples, a standard Deluxe Balcony is the easiest right answer on either ship. Families and anyone wanting more sitting-area space should price a Mini-Suite before assuming they need a full Sanctuary Collection suite.
What is the Sanctuary Collection, and how is it different from Reserve Collection?
Sanctuary Collection is the suite-tier program exclusive to Sun Princess and Star Princess — a dedicated restaurant, lounge, adults-only retreat deck and the Princess Premier package bundled in. Reserve Collection is the equivalent program on every other Princess ship. They serve the same role but are not the same program, and Sphere-class doesn’t use the Reserve Collection name at all.
Did Sun Princess always use Sanctuary Collection branding?
No — she launched in February 2024 under the older Reserve Collection name, matching Princess’s pre-launch messaging, and was rebranded to Sanctuary Collection that October. Star Princess, launching afterward, used Sanctuary Collection branding from her first sailing.
What is the largest cabin on a Sphere-class ship?
The Signature Sky Suite — a two-bedroom, roughly 1,260 sq. ft. suite aft on Deck 16, sleeping up to 5. Only 4 exist per ship.
Are Signature Grand Suites and Signature Vista Suites the same thing?
They’re two distinct suite grades by Princess’s own current naming, but several third-party cabin databases use older "Owner’s Suite" and "Penthouse Suite" names for what appear to be the same physical rooms. Cross-referencing unit counts and sizes across those databases points toward Signature Grand Suite being the smaller, 10-cabin, roughly 564–565 sq. ft. tier and Signature Vista Suite being the larger, 36-cabin tier spanning roughly 305–635 sq. ft. — but no single source states that pairing directly, so we present it as the best-supported reading rather than a confirmed fact.
Is there a Haven-style or Concierge-style top tier on this class?
Yes — Sanctuary Collection functions as this class’s version of that product: a dedicated restaurant, lounge and adults-only deck for suite and Sanctuary Mini-Suite guests, plus the Princess Premier package bundled in.
How many wheelchair-accessible cabins does a Sphere-class ship have?
Roughly 55 per ship, per third-party cabin databases — we could not find an authoritative, Princess-published per-ship count to confirm this against directly, so treat it as a well-sourced estimate rather than an official figure.
What is the motion-sensor light issue on this class?
The nightstand reading lights use a motion sensor sensitive enough that multiple, independent guest accounts on both ships describe them triggering on any nighttime movement. Guests commonly cover them with a towel or pillow. It’s a class-wide hardware trait, not specific to any one category.
What is fact, what is Seabound analysis, and what we hedged on purpose
This guide reflects Seabound’s own research into Princess’s published stateroom data, cross-checked against third-party cruise sources (CruiseMapper, CruiseDeckPlans, Cruise Critic, cruise-journalism outlets and firsthand guest reviews) current as of August 2026 — not a pre-audited or "locked" reference document. This class had more source disagreement than we’d like on a few specific points, detailed below, largely because both ships are still relatively new.
Total stateroom counts vary by source (2,157 vs. 2,162 per ship), with one outlier figure (2,237) that doesn’t reconcile with either and looks stale — we present the range rather than a single figure.
Deluxe Balcony square footage ranges from 200 to 236 sq. ft. across the sources we checked, including one guest’s own in-cabin measurement — we present the range rather than picking one number.
The Sanctuary Collection suite-grade naming (Signature Grand Suite vs. Signature Vista Suite, and their older "Owner’s"/"Penthouse" third-party names) isn’t fully pinned down by any single source — but cross-referencing unit counts and sizes across the databases we checked points toward Signature Grand Suite as the 10-cabin, ~564–565 sq. ft. tier and Signature Vista Suite as the 36-cabin, ~305–635 sq. ft. tier, so we present that as our best-supported reading rather than a coin flip.
Accessible-cabin counts (roughly 55 per ship) come from third-party cabin databases, not a Princess-published per-ship document we could independently verify — Princess’s own per-ship accessible-route pages showed only placeholder content as of this research.
We found several forum-thread titles specifically about Deck 16–17 aft noise but could not access their content (paywalled) during this research — we relied on Cruise Critic’s own editorial cabin guide, which independently corroborates the substance of the complaint, rather than the inaccessible threads themselves.
The named-tier category structure, the Sanctuary Collection’s replacement of Reserve Collection on this class specifically, the suite/mini-suite/balcony unit counts, and the Sanctuary Club’s adults-only retreat deck are each confirmed on Princess’s own published materials.
The motion-sensor nightstand light complaint, the laundry-adjacent cabin numbers, the Piazza and Dome noise patterns, and the Cove Balcony’s lower/recessed position are each corroborated by more than one independent source.
Which category is the better buy for a given traveler type, how the four Sanctuary Collection suite grades actually compare to each other, and what each rung of the upgrade ladder is actually purchasing.
This master page doesn’t pretend one dataset fits both ships identically, especially on launch-history detail and the specific cabin numbers behind the noise patterns above. Confirmed cabin numbers and ship-specific detail belong on the two ship pages, which this guide links to throughout.