Grenville Street , St. Helier, St Helier
Description
Location Property is located on the Eastern side of Grenville Street, mid-way between the junctions with Green Street and La Colomberie. More specifically, the premises form part of the prominent Forum development, which principally fronts onto Grenville Street with return frontage onto La Chasse . Grenville Street itself, is a strong business location and is within close proximity of Green Street multi-story car park. We attach a location plan for reference purposes. Description The building will be refurbished, to a modern day, BCO Cat A standard. The building consists of secure basement parking, including an extensive shower facility with ground and four upper floors of high quality efficient open plan style offices. The building will be provided with the following specifications: Suspended ceilings; Integral fluorescent lighting; Flexible comfort cooling / comfort heating system; Painted and plastered walls; Fully accessible raised floors; Carpeted throughout; Dual lift access to all floors; Male and Female W.C. facilities on each floor; Extensive Shower/changing room facilities; Secure basement parking. The floors lend themselves to either open plan or indeed a cellulised office layout thus providing a high degree of occupational flexibility. We attach a set of clear floor plans and various test to fits for reference purposes. Accommodation The approximate net internal areas of the building are as follows: Basement - Parking 14 spaces Basement - Drying room + 5 showers Ground Floor - Offices 3,447 sq. ft. (320.2 sqm) First Floor - Offices 3,734 sq. ft. (346.9 sqm) Second Floor - Offices 3,746 sq. ft. (348.0 sqm) Third Floor - Offices 3,746 sq. ft. (348.0 sqm) Fourth Floor - Offices 3,058 sq. ft. (284.1 sqm) ______________ ______________ Total 17,731 sq.ft. (1647.2…
This property's own sale history, 2005–2016
4 recorded sales of this address in the Places.je transaction register — matched by house name/street and parish, not a unique property ID, so treat this as a strong likely match rather than a certainty.
| Sale date | Price | At 2024 prices |
|---|---|---|
| 2016-07-22 | £318,000 | £460,038 +45% |
| 2015-04-17 | £1,500,000 | £2,264,806 +51% |
| 2005-12-01 | £200,000 | £442,218 +121% |
| 2005-11-01 | £200,000 | £442,218 +121% |
The "2024 prices" column carries each past price forward at the island-wide repeat-sales index — the same money at today's market level, not a valuation of this specific property. It takes no account of the condition the property was in at each sale, or any work done to it since.
Not marked as sole agency on the original listing, so this property may also be marketed by other agents not captured in this data.
Nearby
- PubThe Forum0.08 mi · 2 min walk · 0 min drive
- RestaurantBohemia0.01 mi · 0 min walk · 0 min drive
- CaféLovin' Spoonful0.20 mi · 4 min walk · 1 min drive
- SupermarketTesco0.28 mi · 6 min walk · 1 min drive
- AirportJersey Airport5.8 mi · 19 min drive
- Petrol stationPark Garage0.20 mi · 4 min walk · 1 min drive
- GP surgeryBath Street Medical Centre0.47 mi · 10 min walk · 2 min drive
- DentistBracken Barrett0.60 mi · 13 min walk · 2 min drive
- SchoolVictoria College Prep0.39 mi · 8 min walk · 1 min drive
- Hospital / medical centreBath Street Medical Centre0.47 mi · 10 min walk · 2 min drive
Nearest match in each category, from a fixed list of Jersey amenities — not every pub, café or shop on the island, so treat this as a useful sample, not a complete picture. Distances are straight-line ("as the crow flies"), multiplied by 1.3 to approximate real road-network distance — this is an estimate, not turn-by-turn routing, and actual walking/driving routes may differ. Times assume constant average speeds appropriate to Jersey's roads and 40mph limits: walking 4.5 km/h, cycling 14 km/h, driving 30 km/h — not open-road speeds, and they don't account for traffic, parking or terrain.
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, 320.2 m² of known floor area. Adjust build quality or size for this property
Value added is the extra floor area priced at £6,818/m² — the midpoint asking price per m² among 219 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 |
£95,455 | £70,000 14 m² · mid spec new build range £56,000–£84,000 |
+£25,455 | 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 |
£136,364 | £60,000 20 m² · mid spec refurb range £40,000–£80,000 |
+£76,364 | 86% (84) |
| Two-storey extension Roughly 14 m² on each of two floors. ~28 m² |
£190,909 | £140,000 28 m² · mid spec new build range £112,000–£168,000 |
+£50,909 | 83% (193) |
| Garage, annexe or outbuilding Detached space is worth less per m² than main-house floor area. ~18 m² |
£73,636 | £90,000 18 m² · mid spec new build range £72,000–£108,000 |
−£16,364 | 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
| Sale date | Price | At 2024 prices | Address on register |
|---|---|---|---|
| 2016-07-22 | £318,000 | £460,038 +45% | 17 Grenville Street, St. Helier |
| 2015-04-17 | £1,500,000 | £2,264,806 +51% | 1 Grenville Street, St. Helier |
| 2005-12-01 | £200,000 | £442,218 +121% | 16 Grenville Street, St. Helier |
| 2005-11-01 | £200,000 | £442,218 +121% | 17 Grenville Street, St. Helier |
Matched by house name/street and parish against the Places.je property transaction register — not a unique-ID lookup, so a shared house name could span more than one property. The "2024 prices" column carries each price forward at the island-wide repeat-sales index — it is what that sum of money would be at today's market level, not a valuation of this property, and it takes no account of the condition it was in then or any work done since.
All 13 recorded sales on Grenville Street
Planning history
| Application | Description | Status |
|---|---|---|
| P/2025/10482 | Replace 4th Floor balustrading with new glass balustrading. | 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.
- P/2025/10482 — Internal alteration / change of use
£18,750–£50,000Replace 4th Floor balustrading with new glass balustrading.
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.
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