St Johns Road, St Helier
Not marked as sole agency on the original listing, so this property may also be marketed by other agents not captured in this data.
Getting connected
Jersey has two residential broadband providers: JT — the island's own former state telecom, now Jersey's full-fibre network builder — and Sure, which completed absorbing Airtel-Vodafone's Channel Islands customer base in September 2025 (Airtel-Vodafone no longer trades as a separate operator here). Jersey's copper phone network is largely already history: JT finished building an island-wide fibre-to-the-home network back in July 2018 and has been retiring copper ever since — well ahead of Guernsey, where the equivalent copper switch-off was still under way through 2026. Always confirm actual coverage and switch-over status at this specific address directly with JT or Sure before assuming.
What would improving it be worth?
Modelled for this property in St Helier. Adjust build quality or size for this property
Value added is the extra floor area priced at £7,019/m² — the midpoint asking price per m² among 143 St Helier properties currently for sale that publish a floor area. Cost uses £4,000–£6,000/m² new build and £2,000–£4,000/m² refurbishment, depending on quality. Net is against the mid rate. The last column is how often Jersey actually approves that kind of application.
Unlike the value side of this table (priced from Jersey's own current asking prices), the £4k–6k new-build / £2k–4k refurbishment rates are carried across from guernseyproperties.gg, where they were supplied by that site's owner from local Guernsey experience — they have not been independently verified for Jersey, and construction costs plausibly differ between the islands. Treat the Cost and Net columns as an unverified placeholder until a Jersey-specific quantity surveyor's rate replaces them.
| Improvement | Value it might add | Likely cost | Net | Approved |
|---|---|---|---|---|
| Add a bedroom (single-storey extension) A modest double plus circulation, built new. ~14 m² |
£98,261 | £70,000 14 m² · mid spec new build range £56,000–£84,000 |
+£28,261 | 86% (569) |
| Loft conversion with a bedroom Works inside an existing roof, so it prices as refurbishment rather than new build — which is why it usually wins. ~20 m² |
£140,373 | £60,000 20 m² · mid spec refurb range £40,000–£80,000 |
+£80,373 | 86% (84) |
| Two-storey extension Roughly 14 m² on each of two floors. ~28 m² |
£196,522 | £140,000 28 m² · mid spec new build range £112,000–£168,000 |
+£56,522 | 83% (193) |
| Garage, annexe or outbuilding Detached space is worth less per m² than main-house floor area. ~18 m² |
£75,801 | £90,000 18 m² · mid spec new build range £72,000–£108,000 |
−£14,199 | 82% (216) |
Two things it cannot see. First, it prices floor area at the local average rate — it doesn't know your plot, your roof, your outlook, or whether an extension is physically possible; nor whether your street has a ceiling price that no amount of extending beats. Second, the rate comes from asking prices of other properties currently for sale that state a floor area — a minority of Jersey's live stock, so treat the sample sizes shown as real limits, not decoration.
The obvious alternative method is worse, which is why it isn't used here: comparing a typical 3-bed with a typical 4-bed suggests a bedroom is worth far more than it actually is — a bigger bed-count usually means a bigger house on a bigger plot, so that figure measures the mix of what's for sale, not the value of adding a room.
Before spending anything, get a builder's quote and talk to an architect — the type-of-work approval rates show how often that kind of application actually succeeds.
Sale history
No prior sale found in the Jersey property register for this address.
All 444 recorded sales on St Johns Road
Planning history
| Application | Description | Status |
|---|---|---|
| P/2026/11087 | Partially demolish existing building & extinguish existing vehicular access. Construct 2 No. 2 Bedroom terrace dwellings with associated par… | Refused Full record |
| RP/2025/10368 | Revised Plans to P/2022/1666 (Extend and convert existing dwelling to create 4 no. one bedroom residential units with associated access ways… | Approved Full record |
| P/2025/10343 | Install new JE substation to west of site. | Approved Full record |
| P/2025/10331 | Convert 9 No. residential units into 3 No. residential units on the first, second and third floors. | Approved Full record |
Matched by house name/street and parish against Jersey planning applications decided in the last 3 years — coverage is partial and not a unique-ID lookup.
Estimated cost of live planning permissions
Jersey planning permissions lapse after a set period if unbuilt; these applications fall inside the last 3 years and were not refused, so they are presumptively still capable of being implemented.
- RP/2025/10368 — Internal alteration / change of use
£18,750–£50,000Revised Plans to P/2022/1666 (Extend and convert existing dwelling to create 4 no. one bedroom residential units with as… - P/2025/10343 — Internal alteration / change of use
£18,750–£50,000Install new JE substation to west of site. - P/2025/10331 — Internal alteration / change of use
£18,750–£50,000Convert 9 No. residential units into 3 No. residential units on the first, second and third floors.
The work type shown is inferred automatically from the wording of the planning application's own description — it isn't stated by the applicant. The base cost range comes from published UK national renovation/build-cost guides for that type of project, and a ~25% uplift has been added to reflect higher shipping/import and skilled-labour costs in the Channel Islands — this is an estimate, not a published index. These figures are indicative only, not a quote: actual cost depends on specification, finish, ground conditions and the contractor. For anything serious, get a quote from a local quantity surveyor or builder.
Similar properties
Other current rental listings in St Helier, ranked by how many of the reasons on each card it shares with this one (closest asking price breaks ties) — every reason shown is exactly why it's here, not a hidden score.
