Sigma 33 C Buyer's Guide
Shopping the used market for a Sigma 33 C means looking at the cruising sister to one of David Thomas's most enduring designs. Built by Marine Projects from Plymouth as the masthead-sloop cruising variant of the Sigma 33, the 33 C carries the standard Sigma 33's 32'2" length, 10'6" beam, fin keel with spade rudder, and solid-GRP hull, but carries a shorter rig and shallower draft than the racing OOD version. For a buyer, that means a boat with offshore-capable bones and a more manageable cruising profile.
Layouts on the Used Market
The 33 C exists as a single cruising configuration rather than a range of deck plans: a masthead sloop with the shorter rig and reduced draft that set it apart from the taller, deeper Sigma 33 OOD. The 33 C shares the Sigma 33's essential structure — solid fiberglass, fin keel, spade rudder — and the 9,150-pound displacement with 4,200 pounds of lead ballast.
Equipment and Common Upgrades
On the used market, cabin heating, a spinnaker, and a life raft are commonly fitted to 33 C examples, the kind of gear that signals a boat used for seasonal cruising rather than sole day-sailing. A buyer should treat those three as baseline expectations on a well-equipped example. Beyond confirming those items and the standard Volvo Penta MD2002 diesel, inspection should focus on condition rather than a checklist of factory options.
What to Inspect
Marine Projects built the hull in solid fiberglass with fin keel and spade rudder, and the cruising variant shares the Sigma 33's essential structure anchor. A survey should concentrate on the usual solid-GRP concerns — keel-to-hull joint integrity, rudder stock condition, and general laminate soundness.
Availability and Buyer's Takeaway
The Sigma 33 C is found in the United Kingdom market. For a shopper, the takeaway is straightforward:
- Confirm the boat is the 33 C cruising variant, not the OOD, by rig height and keel depth
- Verify cabin heating, spinnaker, and life raft are present if expected
- Survey the solid-GRP hull, fin keel joint, and spade rudder as the primary structural points
- Expect a low-volume sister to a well-regarded one-design rather than a mass-market cruiser
Price & volume trends
Monthly asking-price and listing-volume trends for the Sigma 33 C. The line shows the median ask each month; the bars show how many listings appeared.
Monthly breakdown · 2 rows
| Month | Listings | Median ask | Δ vs. last mo. |
|---|---|---|---|
| Apr 26 | 1 | $11,943 | — |
| Oct 26 | 2 | $19,905 | +66.7% |
Where they're listed
Sigma 33 C listings appear across 1 country. United Kingdom has the most listings with 3.
Country view
3 listings · 1 country| Country | Median ask | Listings · 12 mo | Active · 90 d | Share |
|---|---|---|---|---|
| United Kingdom | $19,905 | 3 | 2 | 100.0% |
Comparable models
Similar length, displacement, and era. Open a row to compare that model's market page.
Similar boats to compare
11 similar designs| Model | LOA | Median ask | Listings · 12 mo | Active · 90 d |
|---|---|---|---|---|
| Contessa 32 | 32' | $ 32,990 | 68 | 20 |
| Sigma 33 Ood | 32.5' | $ 18,778 | 30 | 9 |
| Tartan 34 C | 34.42' | $ 21,400 | 24 | 11 |
| Cape Dory 30 C | 30.21' | $ 19,200 | 20 | 9 |
| C&C 30 Mk I | 30' | $ 14,223 | 20 | 1 |
| Conyplex 33 | 32.25' | $ 24,500 | 15 | 4 |
| Friendship 33 | 32.8' | $ 34,093 | 14 | 7 |
| CS 33 | 32.67' | $ 21,053 | 13 | 3 |
| Scanmar 33 | 33.17' | $ 36,978 | 11 | 3 |
| Sweden Yachts C34 | 34' | $ 39,146 | 8 | 2 |
| Sigma 33 CYou are here | — | $ 19,905 | 3 | 2 |