Architecture20/20
Michael Twigg · remodelled by Nicolas Pople in 2011
Aveno permanent dossier · published 26 Aug 2026
Boundary Place
Warninglid, West Sussex
Independent reading
A 5,343 sq ft award-winning modernist house and two-bedroom annexe, reworked around timber, stone, glass and panoramic High Weald views.
Boundary Place clears the Pavello benchmark through authored modern architecture, exceptional Bulthaup-led interiors, a secluded landscaped setting, rare EPC A performance and a flexible annexe-and-studio lifestyle. The £3.25m guide is about £608/sq ft on the current primary 5,343 sq ft figure. A parallel Jackson-Stops record states 7,321 sq ft and describes five principal bedrooms plus a two-bedroom annexe, so a signed component measurement and the live 2026 lawfulness application are decision gates rather than footnotes.
Remarkability100/100
Data readiness94/100
Ownership intensityHigh
Why this belongs in Aveno
Remarkable is
an evidence test.
Flagship intelligence100remarkability / 100
Admitted to Aveno: unmistakably premium modern architecture, a live listing, defensible identity, structured buyer intelligence and a working exact-property publisher film.
Luxury and finish20/20
Premium specification and lifestyle scale.
Privacy and setting19/20
Detached and materially private; legal boundaries remain to verify.
Visual quality20/20
Working exact-property publisher film.
Market distinction20/20
Price, rarity and accommodation support admission.
Data-readiness audit · 94/100
Exact identity20/20
Boundary Place, Long House Lane, Warninglid, Haywards Heath, West Sussex; official UPRN/title bridge remains buyer-side.
Market status20/20
Live primary or syndication listing checked 26 Aug 2026.
Price and area18/20
£608/sq ft from current guide and publisher area.
Buyer intelligence17/20
Costs, title, planning, energy, environmental and comparable questions are structured.
Rights and media20/20
Exact-property Cloudflare Stream player with fallback.
- A 5,343 sq ft award-winning modernist house and two-bedroom annexe, reworked around timber, stone, glass and panoramic High Weald views.
- 5,343 sq ft at £3.3m clears Aveno's luxury threshold.
- The exact-property film shows the real architecture and interiors without Aveno reproducing agent media.
- Live listing and current guide
- Exact-property publisher-controlled film
- Price-density and component cost model
- Transaction and comparable caveats kept explicit
- Official title number, UPRN, registered acreage and the legal access/road description
- Signed component-area schedule explaining the 5,343 versus 7,321 sq ft records and five-versus-seven bedroom presentation
- Final outcome and full document set for DM/26/0958 plus earlier planning, Building Control, structural and system warranties
- Actual energy, water, grounds, pond, hot-tub, smart-system, access and insurance costs
Aveno Decision Engine · live model
What does the evidence
change?
Current buyer actionVIEW — VERIFY THE DECISION PACK
Boundary Place clears the Pavello benchmark through authored modern architecture, exceptional Bulthaup-led interiors, a secluded landscaped setting, rare EPC A performance and a flexible annexe-and-studio lifestyle. The £3.25m guide is about £608/sq ft on the current primary 5,343 sq ft figure. A parallel Jackson-Stops record states 7,321 sq ft and describes five principal bedrooms plus a two-bedroom annexe, so a signed component measurement and the live 2026 lawfulness application are decision gates rather than footnotes.
Identity confidence98%
Boundary Place, Long House Lane, Warninglid, Haywards Heath, West Sussex
The live The Modern House instruction and current Rightmove and OnTheMarket records align on the unique named Boundary Place in Warninglid: £3.25m, freehold, seven bedrooms across the principal house and attached annexe, five bathrooms, 5,343 sq ft, EPC A and the same exact-property Cloudflare Stream film. Architectural and transaction records independently place Boundary Place at Long House Lane, RH17 5TE and join the 1970s Michael Twigg house to Nicolas Pople's 2011 remodelling. Some market surfaces call the approach Spronketts Lane, while address records use Long House Lane; the title plan, UPRN and registered access must settle that road-label difference.
UPRNStill protected
01
Premium test
Is the asking premium supported?
Guide midpoint£3,250,000£6,547 / m²
versusLocal evidence benchmarkWithheld0 size-known local references
Subject vs unadjusted evidence—
ReferenceDateAreaPrice / ask£/m²
Resulting referenceWithheldNot a valuation. It exposes how much premium the evidence must justify.
The references are not a surveyor-selected valuation set. Recency, condition, land, architecture and improvements are not fully adjusted. Aveno shows the gap instead of hiding it behind false precision.
02
True ownership load
The cost after the keys.
Five-year cost above purchase price£655,250–£1,055,750SDLT + disclosed transaction extras + acquisition checks + modelled running and replacement allowances. Mortgage interest and major defects excluded.
Council taxCurrent listing band; exact authority charge and any annexe assessment to verify.£3,500–£6,000attributed
Energy, water and private systemsScale, plant, pool/estate systems and attributed energy setup; bills missing.£13,000–£35,000modelled
Insurance and securityHigh-value rebuild, gates, glazing, outbuildings and setting.£7,800–£21,000modelled
Building, plant and interior reserveComponent-based reserve for envelope, glazing, smart controls, kitchens, bathrooms and mechanical plant.£26,000–£49,000modelled
Grounds, access and lifestyle amenitiesLandscaping, woodland/land, pool/equestrian/garaging where applicable and access upkeep.£18,200–£35,000modelled
03
Claim audit
Marketing claim → buyer consequence.
Evidence readiness94/100
Tap the evidence cards as if the seller supplied them. Aveno recalculates the decision—not the beauty.
PROCEED TO VALUATION04
Property memory
The home’s price story.
14 Feb 2020£2,150,000Recorded sale · Freehold
51% nominal uplift6.5% annualisedCurrent guide midpoint£3,250,000Asking evidence, not a sale
This history does not prove fair value. It tells the buyer exactly how much of the current price must be explained by market growth, improvements, specification and scarcity.
Official evidence map
What is matched.
What is withheld.
Land Registry can establish sale history; EPC can reveal rated floor area and energy assumptions; Planning Data can surface constraints by UPRN or coordinate. A link alone is never counted as intelligence.
connected
Live primary £3
Live primary £3.25m instruction with working viewing route, Boundary Place identity, freehold tenure, seven bedrooms, five bathrooms, 5,343 sq ft, EPC A, architecture, interiors, annexe and landscape programme.
Source ↗connectedCurrent 10 August 2026 cross-market instruction confirms £3
Current 10 August 2026 cross-market instruction confirms £3.25m, 5,343 sq ft, seven bedrooms, five bathrooms, freehold tenure, EPC A and the matching named property.
Source ↗connectedPublisher-controlled exact-property Cloudflare Stream player exposed directly by the current OnTheMarket instruction
Publisher-controlled exact-property Cloudflare Stream player exposed directly by the current OnTheMarket instruction.
Source ↗connectedIndependent modern-house record identifies Boundary Place, Long House Lane, RH17 5TE, the 1970s Michael Twigg house, Nicolas Pople's 2011 remodelling and the Sussex Heritage Trust reference
Independent modern-house record identifies Boundary Place, Long House Lane, RH17 5TE, the 1970s Michael Twigg house, Nicolas Pople's 2011 remodelling and the Sussex Heritage Trust reference.
Source ↗connectedProject-team award record names Boundary Place and its 2012 Mid Sussex design, sustainability, restoration/extension and Sussex Heritage Trust awards
Project-team award record names Boundary Place and its 2012 Mid Sussex design, sustainability, restoration/extension and Sussex Heritage Trust awards.
Source ↗not matchedCurrent planning index identifies exact-address application DM/26/0958, validated 21 April 2026, seeking a Certificate of Lawfulness for works said to have been substantially completed more than four years earlier; obtain the final decision and full documents from Mid Sussex
Current planning index identifies exact-address application DM/26/0958, validated 21 April 2026, seeking a Certificate of Lawfulness for works said to have been substantially completed more than four years earlier; obtain the final decision and full documents from Mid Sussex.
Source ↗connectedLand Registry-derived exact-address record identifies the £2
Land Registry-derived exact-address record identifies the £2.15m freehold sale on 14 February 2020, used with an explicit post-sale works and area caveat.
Source ↗connectedOpen Postcode-derived RH17 5TE address and centroid evidence supports the archive map; the title plan remains authoritative for parcel and access
Open Postcode-derived RH17 5TE address and centroid evidence supports the archive map; the title plan remains authoritative for parcel and access.
Source ↗not matchedProperty-level river, surface-water, groundwater, drainage, pond and climate-risk evidence remains required
Property-level river, surface-water, groundwater, drainage, pond and climate-risk evidence remains required.
Source ↗Published / verified
- The live primary listing offers Boundary Place at £3.25m with seven bedrooms, five bathrooms, 5,343 sq ft, freehold tenure, EPC A and Council Tax Band G.
- The current exact-property film remains in The Modern House's publisher-controlled Cloudflare Stream player exposed by the live OnTheMarket instruction.
- The 1970s Michael Twigg house was remodelled and extended by Nicolas Pople in 2011; Douch Partners records Mid Sussex and Sussex Heritage Trust awards for design, sustainability and small-scale residential work.
- The principal living sequence is attributed as a 52 ft Bulthaup kitchen, dining, sitting and family space with Gaggenau, Sub-Zero and Liebherr appliances, local stone, full-height glazing and a direct relationship to the south-facing landscape.
- The accommodation includes five principal-house bedrooms, an attached two-bedroom annexe, a gym link, detached office, guest pod, four-bay carport with EV charging, ponds, hot tub, fire pit and extensive landscaped grounds.
Investigate next
- Obtain the official title register and plan, UPRN and registered acreage, then reconcile Long House Lane versus Spronketts Lane, access rights, covenants, boundaries, outbuildings and the attributed 3.5-acre extent.
- Retrieve the complete original and 2011 planning, Building Control, structural, glazing, ground-source heat-pump, photovoltaic, MVHR and warranty archive, together with application DM/26/0958 and its final Certificate of Lawfulness decision.
- Commission a RICS component measurement reconciling the current 5,343 sq ft primary figure with the 7,321 sq ft parallel record, separating the main house, annexe, gym link, office, guest pod, carport and stores.
- Obtain three years of electricity import/export, heat-pump, PV, MVHR, air-conditioning, hot-tub, water, landscape, pond, private-access, security and insurance records; commission property-level flood, drainage, ecology and High Weald constraints checks.
Still unknown
- Official title number, UPRN, registered acreage and the legal access/road description
- Signed component-area schedule explaining the 5,343 versus 7,321 sq ft records and five-versus-seven bedroom presentation
- Final outcome and full document set for DM/26/0958 plus earlier planning, Building Control, structural and system warranties
- Actual energy, water, grounds, pond, hot-tub, smart-system, access and insurance costs
Primary publisher · visual-rights recordThe Modern HouseOpen original source ↗Open rights-basis evidence ↗
All property film and photography remain publisher-controlled. Only the live film player and original Aveno evidence graphics are permitted; social stills require separate written permission. The exact-property film remains inside the publisher-controlled Cloudflare Stream player exposed by the live listing. Aveno copies, downloads, screenshots, rehosts and hotlinks none of the agent media. The dossier retains an Aveno evidence panel and direct publisher/source links if the remote player is unavailable; no broken-image panel is rendered. Third-party material remains the property of its publisher. The publisher does not endorse Aveno’s independent assessment.
Durable archive record
Versioned evidence.
Every claim traceable.
Record 1.0-private · admission policy 2026-08-luxury. Facts, attributed claims, estimates and gaps remain separate.