Irwin 37-1 Buyer's Guide
The Irwin 37 is a center-cockpit coastal cruiser built by Irwin Yachts between 1971 and 1982, with more than 600 hulls produced across five marks. Ted Irwin’s 37-foot design pairs a fin keel with skeg rudder and a masthead sloop rig, and it remains a common entry into a roomy two-cabin boat without bluewater pretensions. Shopping used Irwin 37s means weighing a fundamentally sound but lightly built hull against a known list of production defects.
Layouts on the Used Market
The interior plan barely changed across the run: a forward V-berth, mid-saloon, and a spacious aft cabin reached along a port passageway, with two heads—each with a shower—at opposite ends. Reviewers judged the aft cabin the best owner’s-layout value in a series-built boat below forty feet, and both sleeping cabins get queen berths with 4-inch mattresses. The galley is to starboard aft of the saloon, while the large icebox sits remote in the port passage. The cockpit is small, seating four at most, but high and dry amidships. Early boats lacked bowsprits and showed more freeboard; later marks gained first fiberglass then welded-aluminum bowsprits.
Equipment and Common Upgrades
Power and energy center on the 40-hp Perkins diesel (4-107 or 4-108) turning a three-bladed prop through 2:1 reduction, with walk-through panels giving class-leading access and insulation. Refrigeration came as a front-opening Norcold plus two top-opening iceboxes. Sail handling began with a sloop rig and near-universal roller-furling genoa; cutter and ketch options exist, the ketch adding about 60 square feet. A 30-pound plow anchor lived in a bowsprit roller chock. Navigation and comfort lean on smoked-glass hatches and a single giant lazarette; the fold-up cabin table is a weak point worth replacing.
What to Inspect
Every through-hull on the Irwin 37 uses a gate valve rather than a marine seacock, and some fittings were not installed flush with the hull—both are serious and must be corrected. The deck-to-hull joint is lightly built and damaged by minor dock impacts; deck-core rot from poorly bedded fittings is common. Later hulls show deep bottom hollows from green molding, and the stainless rudder gudgeon has stress-corrosion evidence. Gelcoat defects range from thin or missing to crazed, and diamond non-skid repair is impractical on early boats. The fiberglass bowsprit crazed or failed at its attachment; aluminum ones are better. Check the welded bobstay plates for corrosion where awash.
Availability and Buyer's Takeaway
Expect these boats wherever 1970s production cruisers trade. For a coastal or Bay boat, prioritize a later Mark with aluminum bowsprit, random non-skid, and Cormat-reduced print-through, then budget to convert gate valves, repair deck core, and verify the hull-deck joint and rudder gudgeon.
- Convert all gate valves to seacocks; confirm flush through-hulls
- Survey deck core and hull-deck joint for impact or rot
- Inspect rudder gudgeon and bobstay for corrosion
- Verify bowsprit attachment and gelcoat history
Comparable models
Similar length, displacement, and era. Open a row to compare that model's market page.
Similar boats to compare
4 similar designs| Model | LOA | Median ask | Listings · 12 mo | Active · 90 d |
|---|---|---|---|---|
| Irwin 38-2 | 40' | $ 40,000 | 27 | 13 |
| Irwin 41 | 41.5' | $ 51,950 | 20 | 3 |
| Gulfstar 37 | 37' | $ 21,000 | 11 | 3 |
| CSY 37 | 37.25' | $ 29,900 | 8 | 2 |