Architecture20/20
BARC Architects
Aveno permanent dossier · published 4 Sep 2026
Sanctuary House
Mount Howe, Topsham, Devon
Independent reading
An award-winning 5,188 sq ft BARC Architects estuary house with a 200 sq m glazed living pavilion, hydraulic lift, annexe and renewable smart-home systems.
Sanctuary House clears Aveno's Pavello-level threshold through independently recognised contemporary authorship, a powerful protected-estuary relationship, genuine accessibility and an unusually coherent environmental and smart-home programme. The £3m guide is about £578/sq ft on Savills' 5,188 sq ft figure. That blended density includes the architectural setting, terraces, annexe and complex systems and is not a valuation conclusion: the title, 2018 completion archive, signed component measurement and environmental/operating evidence must be joined before an offer.
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
Sanctuary House, Mount Howe, Topsham, Exeter, Devon; official UPRN/title bridge remains buyer-side.
Market status20/20
Live primary or syndication listing checked 4 Sep 2026.
Price and area18/20
£578/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 Facebook player with fallback.
- An award-winning 5,188 sq ft BARC Architects estuary house with a 200 sq m glazed living pavilion, hydraulic lift, annexe and renewable smart-home systems.
- 5,188 sq ft at £3.0m 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 plot and complete private-road, boundary, covenant, access, service, drainage and conservation position
- Complete planning, condition-discharge, Building Control, completion, structural, warranty and professional-appointment archive for the replacement dwelling and annexe
- Signed RICS component area and the inclusion basis for the 5,188 sq ft market figure
- Measured operating costs, current EPC certificate, system service history, property-level flood/drainage evidence, insurability and replacement-cost valuation
Aveno Decision Engine · live model
What does the evidence
change?
Current buyer actionVIEW — VERIFY THE DECISION PACK
Sanctuary House clears Aveno's Pavello-level threshold through independently recognised contemporary authorship, a powerful protected-estuary relationship, genuine accessibility and an unusually coherent environmental and smart-home programme. The £3m guide is about £578/sq ft on Savills' 5,188 sq ft figure. That blended density includes the architectural setting, terraces, annexe and complex systems and is not a valuation conclusion: the title, 2018 completion archive, signed component measurement and environmental/operating evidence must be joined before an offer.
Identity confidence100%
Sanctuary House, Mount Howe, Topsham, Exeter, Devon
Savills' live original instruction EXS260202 and its current Rightmove distribution name Sanctuary House at Mount Howe, Topsham, EX3 0BG and align on a £3m guide, detached/freehold form, four bedrooms, three bathrooms, 5,188 sq ft, EPC B and Council Tax G. RIBA's project record independently joins the same named Mount Howe replacement dwelling to BARC Architects, its estuary outlook, stone-and-larch glazed pavilion, lift and renewable systems. Savills' exact-property film and the exact-address HM Land Registry-derived record complete a decisive identity chain; the official title, UPRN and current EPC certificate remain buyer-side.
UPRNStill protected
01
Premium test
Is the asking premium supported?
Guide midpoint£3,000,000£6,224 / m²
versusLocal evidence benchmarkWithheld0 size-known local references
Subject vs unadjusted evidence—
ReferenceDateAreaPrice / ask£/m²
The Little White House, Mount Howesame private road and postcodeFeb 2022—£1,695,000—The Belveder, Mount Howesame private road and postcodeJul 2024—£1,800,000—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£620,250–£1,075,750SDLT + 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.£12,800–£37,500modelled
Insurance and securityHigh-value rebuild, gates, glazing, outbuildings and setting.£7,680–£22,500modelled
Building, plant and interior reserveComponent-based reserve for envelope, glazing, smart controls, kitchens, bathrooms and mechanical plant.£25,600–£52,500modelled
Grounds, access and lifestyle amenitiesLandscaping, woodland/land, pool/equestrian/garaging where applicable and access upkeep.£17,920–£37,500modelled
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.
6 Jul 2015£870,000Recorded sale · Freehold
245% nominal uplift11.7% annualisedCurrent guide midpoint£3,000,000Asking 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 original Savills instruction EXS260202 with current enquiry route confirms the named Mount Howe house, £3m guide, detached/freehold form, four bedrooms, three bathrooms, 5,188 sq ft, EPC B, Band G and complete architectural, landscape and systems programme
Live original Savills instruction EXS260202 with current enquiry route confirms the named Mount Howe house, £3m guide, detached/freehold form, four bedrooms, three bathrooms, 5,188 sq ft, EPC B, Band G and complete architectural, landscape and systems programme.
Source ↗connectedCurrent Savills distribution, added 28 August 2026, independently confirms £3m, detached/freehold form, four bedrooms, three bathrooms, 5,188 sq ft, EPC B and a live market route
Current Savills distribution, added 28 August 2026, independently confirms £3m, detached/freehold form, four bedrooms, three bathrooms, 5,188 sq ft, EPC B and a live market route.
Source ↗connectedPublic exact-property Sanctuary House film published by Savills; permitted publisher-controlled Facebook player and direct fallback link only, with no copied stills, screenshots, downloads, rehosting or hotlinks
Public exact-property Sanctuary House film published by Savills; permitted publisher-controlled Facebook player and direct fallback link only, with no copied stills, screenshots, downloads, rehosting or hotlinks.
Source ↗connectedKnight Frank Exeter's closed prior instruction preserves the named exact-property identity, freehold tenure, Band G, architecture, accommodation and systems
Knight Frank Exeter's closed prior instruction preserves the named exact-property identity, freehold tenure, Band G, architecture, accommodation and systems.
Source ↗connectedRIBA's architect directory identifies BARC Architects' Sanctuary House as the Mount Howe new-build replacement dwelling and documents its conservation setting, materials, glazed pavilion, lift, accessibility and renewable systems
RIBA's architect directory identifies BARC Architects' Sanctuary House as the Mount Howe new-build replacement dwelling and documents its conservation setting, materials, glazed pavilion, lift, accessibility and renewable systems.
Source ↗connectedHM Land Registry-derived street data identifies the exact detached freehold address and its £870,000 July 2015 transaction, plus explicitly unmatched same-road anchors
HM Land Registry-derived street data identifies the exact detached freehold address and its £870,000 July 2015 transaction, plus explicitly unmatched same-road anchors.
Source ↗not matchedOfficial Exeter planning route; the complete replacement-dwelling application, conditions, Building Control completion and conservation archive remains to retrieve and reconcile
Official Exeter planning route; the complete replacement-dwelling application, conditions, Building Control completion and conservation archive remains to retrieve and reconcile.
Source ↗not matchedProperty-level river, surface-water, groundwater, drainage, climate and insurance evidence remains required for the elevated estuary-facing site
Property-level river, surface-water, groundwater, drainage, climate and insurance evidence remains required for the elevated estuary-facing site.
Source ↗Published / verified
- Savills currently offers the named detached freehold house at a £3m guide with four bedrooms, three bathrooms, 5,188 sq ft, EPC B and Council Tax G.
- RIBA identifies Sanctuary House as BARC Architects' new-build replacement dwelling on Mount Howe and describes the stone-clad base, glazed pavilion, natural material palette, lift and accessible lifetime-home planning.
- The first-floor Eyrie provides about 200 sq m of open-plan living space opening to approximately 150 sq m of terraces overlooking the Exe Estuary and Bowling Green Marsh reserve.
- The programme includes a self-contained Wee Sanctuary annexe, hydraulic lift, biometric entry, vehicle turntable, Bang & Olufsen cinema and outdoor kitchen.
- Air-source heating, photovoltaics, Tesla Powerwall storage, EV charging, MVHR and integrated Lutron, DALI and RTI controls are attributed by the current instruction and architectural record.
- Savills publishes an exact-property Sanctuary House film; Aveno embeds only Meta's publisher-controlled remote player and no agent photographs or stills.
Investigate next
- Obtain the official title register and plan, UPRN and conservation-area searches, confirming the private-road rights, boundaries, parking, garden and annexe status, covenants, services, drainage and estuary-facing obligations.
- Retrieve the complete replacement-dwelling planning file, condition discharges, Building Control completion, structural design, warranties, professional appointments and commissioning records, then reconcile the 2018 built form to the approvals.
- Commission a signed RICS component measurement separating principal accommodation, annexe, garage, plant and terraces and reconciling Savills' 5,188 sq ft statement with approved and as-built drawings.
- Obtain three years of energy, water, battery, heat-pump, MVHR, lift, security, smart-home and landscape records, then commission specialist envelope, glazing, roof, structure, drainage, flood, subsidence, biodiversity and high-value insurance reviews.
Still unknown
- Official title number, UPRN, registered plot and complete private-road, boundary, covenant, access, service, drainage and conservation position
- Complete planning, condition-discharge, Building Control, completion, structural, warranty and professional-appointment archive for the replacement dwelling and annexe
- Signed RICS component area and the inclusion basis for the 5,188 sq ft market figure
- Measured operating costs, current EPC certificate, system service history, property-level flood/drainage evidence, insurability and replacement-cost valuation
Primary publisher · visual-rights recordSavills ExeterOpen 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. Savills publishes this exact-property Sanctuary House film through its public Facebook video page. Aveno uses only Meta's publisher-controlled remote player and direct source link and copies, downloads, screenshots, rehosts and hotlinks none of the film or listing photography. 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.
Record integritySee something inaccurate or hold better evidence?
Request a correction →Aveno records corrections and preserves the observation date. Owners, agents, architects and rights-holders are invited to provide documentary evidence.
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.
Aveno Time MachineFollow this home’s market history.
Open market timeline →Price, status, withdrawal, relisting and sale signals are preserved as dated observations. Missing history is never reconstructed as fact.