Southerly 100 Buyer's Guide
The Southerly 100 occupies a genuinely distinctive corner of the used-boat market. Built by Northshore Yachts in the United Kingdom across a production run stretching from the early 1980s to the early 2000s, this 33-foot swing-keel cruiser was designed for the kind of sailing that defines the British coastal experience: tidal estuaries, shallow anchorages, and harbours that dry at low water. That retractable iron swing keel, which reduces draft to well under a metre when raised, is the boat's defining feature and the first thing a prospective buyer should understand. It opens up destinations unreachable to fixed-keel cruisers of comparable size, but it also introduces a mechanical system that demands diligent maintenance and careful pre-purchase scrutiny. Buy the boat with the keel in mind, and you will be rewarded with a versatile, stiff, six-berth cruiser that punches above its displacement in comfort and sea-keeping. Neglect it, and you have bought a problem.
Layouts on the Used Market
The Southerly 100 was configured as a six-berth cruiser throughout its production life, and examples on the brokerage market largely reflect a single interior arrangement: a forward V-berth, a central saloon with settee berths on either side, and an aft cabin or aft quarters that complete the sleeping plan. The layout is generous for a 33-foot boat, a product of the wide-beam hullform that Northshore favoured for its lifting-keel designs. Headroom in the saloon is adequate for standing use, and the galley is typically laid out to starboard with reasonable worktop space for coastal passage-making. The heads compartment is compact but functional, reflecting the standards of its era. Buyers should not expect the ergonomic refinement of more recent designs, but the layout feels purposeful and well thought through for family cruising.
Equipment and Common Upgrades
Used examples commonly come to market well equipped, reflecting the long ownership tenures typical of this class of boat and the continuous investment owners tend to make over many years. Autopilots and chartplotters are commonly fitted, as is some form of heating — a sensible addition given the boat's natural home waters in the UK and Ireland. Radar is frequently encountered on brokerage boats. Furling mainsails have become widespread across the fleet, replacing the original slab-reefed rigs as owners seek easier short-handed handling; this is a change worth noting because the aerodynamic efficiency of a furling main differs from a fully battened slab-reefed sail, so buyers with performance expectations should confirm the rig configuration.
Wind generators and life rafts are often seen aboard boats that have seen offshore miles, reflecting the extended coastal and passage-making use the 100 was built for. Dinghy davits and hot-water systems appear on a meaningful share of cruising-equipped examples. The boat's lifting keel also makes it well suited to short-handed crews, and many owners configure the cockpit accordingly with rope-clutch arrays, reefing lines led aft, and similar singlehanded-friendly additions.
Owner upgrades that appear with some frequency include inverters for domestic power management, biminis for shelter in the cockpit, AIS transponders, and the occasional spinnaker or asymmetric cruising chute for light-air sailing. Electric winches and swim platforms represent more ambitious upgrades found on a smaller share of the fleet.
What to Inspect
The swing keel demands top priority on any survey. The pivot pin, its housing, and the lifting mechanism — typically hydraulic or tackle-based depending on the year of build — are all wear items that can be expensive to address if neglected. Keels with moving parts need to be inspected and maintained on a regular basis according to advice given in the owner's manual, and manufacturers usually advise which maintenance work can be done by the owner and which should be carried out by a suitably experienced boatyard. Insist on seeing the keel raised and lowered under load, and have the surveyor inspect the keel trunk closely for signs of water ingress, gelcoat cracking, or corrosion around the pivot assembly. The keel itself is iron rather than lead, which makes it more susceptible to corrosion if the protective coating is allowed to deteriorate.
The fibreglass hull is broadly low-maintenance, but boats of this age should be carefully checked for osmotic blistering, especially around the waterline and the keel trunk area where water sits and works. The deck hardware fittings and chainplates on older examples warrant close inspection for signs of weeping or dezincification, which is common in fittings that have seen several decades of salt water. The inboard Yanmar diesel, where fitted, is a well-regarded engine with good parts availability, but service history matters enormously on a motor of this age — confirm that cooling, impellers, and injectors have been kept to schedule. On boats without a log of maintenance work, budget accordingly.
The standing rigging should be assessed on any boat approaching the upper end of the production run. Wire shrouds and forestays do not last indefinitely, and on a boat used in offshore conditions the consequences of failure are serious. Similarly, running rigging — sheets, halyards, furling lines — on older boats is frequently overdue for replacement even when it looks superficially serviceable.
Availability and Buyer's Takeaway
The Southerly 100 trades predominantly in the United Kingdom and Ireland, where the boat was primarily sold and where its tidal-estuary capability is most valued. Netherlands-based brokerage also sees examples from time to time, reflecting the boat's appeal to North Sea and Baltic coastal sailors. Wider international availability is limited compared with more globally distributed cruising designs of similar vintage, so buyers outside northern Europe may need to factor in delivery costs.
For the right buyer — someone who wants access to shoal water, values a stiff sea-kindly hull, and is prepared to maintain a mechanical keel system properly — the Southerly 100 offers genuinely unusual capability. Approach the purchase methodically:
- Commission a full survey from a surveyor experienced with swing-keel or lifting-keel designs specifically
- Witness the keel mechanism raised and lowered before the boat is lifted
- Inspect the keel trunk, pivot pin, and all associated hardware closely for corrosion and water ingress
- Confirm the keel's protective coating is intact and review any repair history around that system
- Check hull for osmotic blistering, particularly around the keel trunk area
- Verify standing rigging age and condition; budget for renewal if documentation is absent
- Review engine service records and confirm raw-water cooling system is in good order
- Assess whether a furling mainsail or slab-reefed rig is fitted and decide which suits your sailing plans
- Confirm heating, AIS, and safety equipment are present and serviceable if these are priorities for your cruising ground
Price & volume trends
Monthly asking-price and listing-volume trends for the Southerly 100. The line shows the median ask each month; the bars show how many listings appeared.
Monthly breakdown · 8 rows
| Month | Listings | Median ask | Δ vs. last mo. |
|---|---|---|---|
| Sep 25 | 6 | $ 34,866 | — |
| Oct 25 | 2 | $ 37,213 | +6.7% |
| Nov 25 | 1 | $ 33,666 | -9.5% |
| Feb 26 | 1 | $ 42,108 | +25.1% |
| Mar 26 | 2 | $ 43,443 | +3.2% |
| Apr 26 | 10 | $ 33,666 | -22.5% |
| Jun 26 | 1 | $ 27,960 | -16.9% |
| Jul 26 | 1 | $ 33,951 | +21.4% |
Where they're listed
Southerly 100 listings appear across 3 countries. United Kingdom has the most listings with 15 (65.2%), followed by Ireland and Netherlands.
Country view
23 listings · 3 countries| Country | Median ask | Listings · 12 mo | Active · 90 d | Share |
|---|---|---|---|---|
| United Kingdom | $ 36,878 | 15 | 0 | 65.2% |
| Ireland | $ 33,666 | 5 | 2 | 21.7% |
| Netherlands | $ 42,796 | 3 | 0 | 13.0% |
Comparable models
Similar length, displacement, and era. Open a row to compare that model's market page.
Similar boats to compare
8 similar designs| Model | LOA | Median ask | Listings · 12 mo | Active · 90 d |
|---|---|---|---|---|
| Southerly 115 | 36.83' | $ 83,730 | 44 | 15 |
| J-Boats J/100 | 32.8' | $ 89,900 | 30 | 6 |
| SOUTHERLY 100You are here | — | $ 36,171 | 23 | 1 |
| Southerly 420 | 42.19' | $ 498,695 | 16 | 3 |
| Southerly 35 RS | 35.5' | $ 140,666 | 11 | 5 |
| Southerly 32 | 32.71' | $ 134,813 | 10 | 0 |
| Southerly 105 | 35.43' | $ 45,414 | 8 | 3 |
| SOUTHERLY 42 Rst | 42.19' | $ 334,911 | 7 | 2 |