Apartment 10, Chateau des Roches
Description
St Brelade’s Bay has long been regarded as one of the most coveted addresses in Jersey, and Apartment 10 occupies a beautifully elevated position above the bay within Château des Roches. Developed in 1983 as the successor to the original 1870 residence, the Château was designed to embrace its remarkable coastal setting and capture the far-reaching southerly views that define this part of the island.
This south-facing penthouse apartment sits on the top floor and enjoys panoramic vistas across the treetops to the bay beyond. The 25ft main reception room is a wonderfully bright and generous space, framed by those uninterrupted views, while the separate kitchen and adjoining utility room form a practical and well-considered everyday hub. The recently installed luxury kitchen adds a further layer of refinement.
The master suite is approached via a lined ante room with extensive built-in wardrobes and enjoys a dual aspect to the south and west, drawing in both daylight and sea views. An en suite bathroom completes this peaceful retreat. A guest double bedroom, a further office/bedroom and a separate guest bathroom provide excellent flexibility, with a cloakroom located off the entrance hall.
Storage has been thoughtfully integrated throughout, complemented by a private cellar/storage room on the communal ground floor.
Apartment 10 also benefits from a generous double garage within the secure, gated basement parking atrium reserved for residents, with additional visitor parking on the impressive forecourt and its colonnaded entrance.
Beautifully landscaped private gardens wrap around the southern side of the Château, offering calm and carefully tended spaces to enjoy. Mature trees to the south and woodland to the north ensure an exceptional sense of privacy, with neighbouring residential land to the west and access via Le Mont Gras d’Eau to the east.
The lifestyle here is unmistakably Jersey. St Brelade’s Beach, with its cafés, beach shop, renowned restaurants and two highly regarded four-star hotels with spa facilities, sits just a short walk away. The bay offers an appealing blend of water sports, coastal paths and scenic beauty, making this an exceptional place to call home.
Not marked as sole agency on the original listing, so this property may also be marketed by other agents not captured in this data.
What would this cost to buy?
A live estimate, not a quote — change any figure below and everything recalculates immediately. Stamp duty / Land Transaction Tax uses Jersey's own standard-residence bands (see buying property in Jersey for the full table and how share-transfer property differs); the mortgage side is a standard capital-and-interest repayment calculation, not an offer from any lender.
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 Brelade. Adjust build quality or size for this property
Value added is the extra floor area priced at £8,941/m² — the midpoint asking price per m² among 38 St Brelade 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 |
£125,179 | £70,000 14 m² · mid spec new build range £56,000–£84,000 |
+£55,179 | 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 |
£178,828 | £60,000 20 m² · mid spec refurb range £40,000–£80,000 |
+£118,828 | 86% (84) |
| Two-storey extension Roughly 14 m² on each of two floors. ~28 m² |
£250,359 | £140,000 28 m² · mid spec new build range £112,000–£168,000 |
+£110,359 | 83% (193) |
| Garage, annexe or outbuilding Detached space is worth less per m² than main-house floor area. ~18 m² |
£96,567 | £90,000 18 m² · mid spec new build range £72,000–£108,000 |
+£6,567 | 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.
Planning history
No planning application found in the last 3 years for this address.
Estimate the cost of work you're considering
No live planning permission is on file for this address, so there's nothing to price directly — pick the kind of work you're weighing up instead, using the same cost ranges this site applies to real Jersey planning applications.
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.
See the 27 architects, structural engineers and builders working in Jersey. This can't be narrowed to firms who've filed nearby this property or this parish — Jersey's planning register carries no applicant, agent or architect field to match against (see the professionals directory).
Similar properties
Other current listings for sale in St Brelade, 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.
