Photograph 1 of 31 of St. Mary's, Avoca Avenue, Blackrock, Co. Dublin
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St. Mary's, Avoca Avenue, Blackrock, Co. DublinA94R6Y2

€2,950,000

5 Bed~3 Bath~340 m²~BER D

What you'll like:

  • Prestigious location: Situated on one of Blackrock's most sought-after roads, ensuring strong long-term property value retention and desirability.
  • Generous footprint: Offering 340 square meters of floor space, providing substantial room for a large family and flexible living arrangements.
  • Detached period structure: A magnificent detached red-brick residence boasting rare architectural character and classic nineteenth-century visual appeal.
  • Long-term ownership heritage: Having remained in the same family for over seven decades, indicating a deeply cherished and stable family home.
  • High ceiling heights: Impressive vertical dimensions in the reception hall create an immediate sense of grandeur and historical elegance.
  • Authentic period fireplaces: Featuring magnificent marble and timber fireplaces throughout several main rooms that enhance the interior charm.
  • Original architectural details: Retains sliding sash windows, working shutters, and decorative plasterwork which preserve the heritage aesthetic.
  • Light-filled drawing room: Benefiting from a beautiful bay window overlooking the front garden and flooding the main living space with natural light.
  • Formal dining capability: A dedicated dining room featuring direct access to the side garden makes it ideal for hosting guests and family events.
  • Expansive walled garden: A magnificent fully walled rear garden predominantly laid out in lawn offers a wonderfully private and peaceful sanctuary.
  • Substantial land holding: The grounds measure approximately 0.3 acres, providing unusually generous outdoor space for an established suburban setting.
  • Attached large garage: A generously sized garage measuring 5.5 by 4.5 meters offers secure off-street parking and invaluable additional storage.
  • Extension potential: Ample space on both sides and to the rear of the property allows excellent scope for future architectural reconfiguration.
  • Family-friendly layout: Five well-proportioned bedrooms on the upper level cater easily to large families or visiting guests.
  • Proximity to village: Within a short stroll of Blackrock village, providing immediate access to local cafés, boutiques, and shopping centers.
  • Exceptional school proximity: Close to renowned educational institutions including Blackrock College, St Andrew's College, and Willow Park.
  • Higher education access: Located directly across the road from the UCD Smurfit Business College campus, adding unique convenience.
  • Robust transport links: Conveniently positioned within walking distance of the Blackrock DART station and various key bus routes.
  • Easy commuter access: Straightforward connectivity to the N11 ensures rapid travel to Dublin city centre and surrounding commercial hubs.
  • Coastal lifestyle appeal: The coastline and scenic walks are readily accessible, alongside Dún Laoghaire Marina and its four yacht clubs.

But keep in mind:

  • Moderate BER rating: The property holds a D energy rating, meaning a buyer should investigate upgrade requirements to improve thermal efficiency.
  • High energy consumption: An energy performance indicator of over 264 kWh per square meter signals potential for substantial heating and utility costs.
  • Substantial modernization needed: Having remained in the same hands for decades, the interior requires a comprehensive upgrade to meet contemporary standards.
  • Single-glazed preservation limits: Original sliding sash windows contribute charm but may cause drafts, noise infiltration, and heat loss if not retrofitted.
  • Plumbing and wiring review: The age of the residence suggests that electrical and plumbing systems should be thoroughly inspected by professionals.
  • Conservation constraints: Period features and potential heritage status could restrict the nature and scope of modern extensions or alterations.
  • Significant capital outlay: Beyond the asking price, a buyer must budget heavily for extensive refurbishment, redecoration, and potential structural works.
  • Dated bathroom configurations: Existing bathroom suites include older fixtures like bidets and separate WCs that will likely demand complete remodeling.
  • Complex internal circulation: The inclusion of a rear staircase and multiple storage rooms indicates a fragmented layout that may need modern integration.
  • Kitchen size limitations: The kitchen and breakfast room measures a modest 4.2 by 4.6 meters, potentially requiring enlargement for modern family lifestyles.
  • Roof and timber checks: Buyers should commission a specialist survey to assess the roof integrity and check for any hidden timber rot.
  • Garden landscaping investment: While private and spacious, the large lawns will require ongoing maintenance and potentially new landscaping investments.
  • Priced at upper tier: An asking price close to three million euros demands careful appraisal of comparative local sales to ensure fair market value.
  • Unchanged asking price: Recorded price history shows no reduction since tracking began, suggesting the vendor may hold firm expectations.
  • Hidden structural surprises: Older buildings often conceal damp, subsidence, or bygone building practices that require invasive engineering surveys.
  • Disposal of asbestos: Older outbuildings or insulation layers should be checked for hazardous materials prior to undertaking any demolition work.
  • Planning permission hurdles: Expanding the footprint on a prominent avenue may face strict local planning regulations and conservation oversight.
  • Traffic and parking management: While off-street parking is present, busy suburban roads can experience congestion during peak school drop-off hours.
  • Upgrading heating infrastructure: Replacing older gas fires and radiators with a modern heat pump system may be necessary to future-proof efficiency.
  • Disruption during renovations: Living in or preparing a 340-square-meter period home for modern living will involve prolonged construction periods and stress.

Price positioning

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This comparison depends on limited public and listing evidence, which may be incomplete, outdated or not directly comparable. The score is not a percentage, professional valuation or guaranteed estimate. Ask an independent qualified valuer before relying on a property value.
The asking price appears broadly in line, with a slight undervaluation signal.
  • The asking price of €2,950,000 for a 340 square metre detached period residence appears broadly in line with prevailing market values on this prestigious avenue, positioning itself sensibly between lower and higher historical transaction points nearby.
  • Upward valuation signals stem from the property's generous 0.3-acre gardens, substantial floor area, and an array of intact period features, while downward pressure is introduced by the D BER energy rating which indicates substantial modernization costs.
  • The valuation could be supported by strong demand for rare family homes in prime coastal suburbs near elite schools, whereas potential underperformance might be undermined by the capital required to upgrade the dated energy efficiency and interior finishes.
  • Relevant contextual observations include the stable pricing history observed since listing, the advantageous proximity to local amenities and transport nodes, and the wide spectrum of recent transaction values recorded on the same road.

Build Analysis

What we know from similar construction types

  • This is a detached, part red-brick period residence extending to approximately 340 square meters, featuring a wealth of original architectural details such as sliding sash windows, working window shutters, period fireplaces, decorative plasterwork, and timber panelling.
  • Given the property's age and period nature, a buyer should investigate the condition of the roof, structural timbers, plumbing, and electrical systems, as well as verify the operational status of the original sliding sash windows and working shutters.
  • The presence of a D BER rating indicates that the building envelope likely lacks modern insulation, meaning a buyer should inspect for dampness, ventilation issues, and the thermal performance of the walls and windows.
  • The listing notes ample space to the sides and rear for extension or reconfiguration, so a buyer should verify planning permissions and local zoning restrictions for any potential structural alterations or substantial modern extensions.

Retrofit Cost*

Possible renovating / insulating expenditure

  • Estimated deep-retrofit cost: €85,000 to €135,000.
  • Reasoning: The property has a D BER rating and a large floor area of approximately 340 m², featuring period attributes like single-glazed or older sash windows and traditional masonry walls. Bringing a substantial period home of this scale up to a modern B2 BER rating typically requires extensive fabric upgrades, including external or internal wall insulation, roof insulation, a complete heating system upgrade (such as installing a heat pump), and sensitive window solutions or secondary glazing to preserve the historic character while improving energy efficiency.

Heating cost*

Estimated expense to heat this property every year

  • Estimated annual heating cost: approximately 4,000 euro to 5,500 euro.
  • Explanation: Given the D BER rating, large floor area of 340 m2, and period construction features such as sliding sash windows, the property is likely to have higher energy consumption and heat loss compared to a modern home.

Pollution Safe

9/10

Environmental situation to investigate

  • The property is located in an established residential suburb with no apparent major industrial pollution sources or heavy manufacturing facilities immediately adjacent.
  • Any historical or legacy land use concerns in the wider Blackrock area are typical of mature residential and commercial settlements and should be verified independently if required.

Flood Safe

8/10

Water overflow reports to follow up

  • The location sits at a considerable elevation relative to immediate coastal flood zones, lowering the general likelihood of tidal inundation.
  • Standard localized surface water pooling during extreme weather events should be investigated as part of a general property survey.

Recent Local Sales

Verified residential transactions published in the previous five years

Sales on the same street or estate

  • CHARLEMONT, AVOCA AVE, BLACKROCK

    Sale date
    Declared sale price
    €2,000,000.00
  • CHARLEMONT, AVOCA AVE, BLACKROCK

    Sale date
    Declared sale price
    €3,790,000.00
  • ARANMORE, 21 AVOCA AVE, BLACKROCK

    Sale date
    Declared sale price
    €4,500,000.00
  • ARDGLAS, AVOCA AVENUE, BLACKROCK

    Sale date
    Declared sale price
    €1,875,000.00
  • AVONDALE, AVOCA AVE, BLACKROCK

    Sale date
    Declared sale price
    €5,850,000.00

Recent sales in the wider Blackrock area

  • DAWSON LODGE, CROSS AVE, BLACKROCK

    Sale date
    Declared sale price
    €2,300,000.00
  • 18 SHANDON PARK, BLACKROCK, DUBLIN

    Sale date
    Declared sale price
    €960,000.00
  • 2 MOUNTBROOK, STILLORGAN RD, BLACKROCK

    Sale date
    Declared sale price
    €475,000.00
  • APT 3 FRASCATI HALL, SWEETMANS AVE, BLACKROCK

    Sale date
    Declared sale price
    €550,000.00
  • 1A ARDMEEN PARK, BLACKROCK, COUNTY DUBLIN

    Sale date
    Declared sale price
    €1,000,000.00

Source: Property Services Regulatory Authority (PSRA), Residential Property Price Register (PPR). Matching uses address information published by the PPR rather than measured map distance. It may omit nearby properties on differently named streets.

Last Sale

A confidently matched previous PPR transaction for this property

No confidently matched previous sale was found in the Property Price Register.

Buyer fees*

Associated expenses guide

  • Estimated stamp duty: €107,000 — 1% of €1,000,000 + 2% of €500,000 + 6% of €1,450,000.
    ?
    Based on the asking price shown on this page, using standard residential stamp-duty rates. No adjustments are made for VAT, reliefs, mixed-use property or additional land. The final purchase price and your circumstances may change the amount payable.
  • Solicitor legal fees: approximately 3,000 euro to 6,000 euro plus VAT and outlays.
  • Land registration fees: approximately 800 euro to 1,200 euro depending on the property value and registration type.
  • Property valuation fees: approximately 150 euro to 300 euro.
  • Surveyor fees: approximately 1,000 euro to 2,500 euro given the large floor area of 340 m2.
  • Annual home insurance: approximately 1,200 euro to 2,500 euro depending on the level of coverage required for a period residence.

Forum Talk

What people are saying about this area

  • Residents frequently discuss the exceptional desirability and leafy character of Avoca Avenue within Blackrock.
  • Discussions often highlight the convenience of living within a short stroll of Blackrock village, local parks, and the DART station.
  • Locals often note the concentration of prestigious primary and secondary schools in the surrounding area.
  • Traffic calming measures and local infrastructure improvements are occasional topics of interest among community groups in Blackrock.

LifeFit Assessment

How well this property may suit your lifestyle

Family

7 areas
  • Young Children

    The property offers expansive indoor living space spanning 340 square metres and secure, fully walled private gardens that provide a safe play environment for young children.

    8/10
  • Teenagers

    With five well-proportioned bedrooms, multiple reception rooms, and proximity to elite schools such as Blackrock College and St Andrew's College, the home is exceptionally well-suited for teenagers.

    9/10
  • Multi-generational Living

    The generous floor area and versatile layout across two storeys provide strong potential for multi-generational living, though buyers should investigate adapting the space for independent accommodation.

    8/10
  • Single Buyers

    At an asking price of €2,950,000 for a large period property requiring modernisation, this home is typically beyond the scope and practical needs of single buyers.

    3/10
  • Couples

    Couples looking for a long-term family home with significant character will appreciate the property, though the extensive maintenance requirements of a 340 sq m period home should be considered.

    6/10
  • Empty Nesters

    Empty nesters seeking a prestigious Blackrock address with period charm will find plenty of appeal, provided they are prepared to manage a large residence and extensive gardens.

    7/10
  • Retirees

    While the location is superb for amenities and healthcare access, retirees should evaluate the multi-level layout and potential refurbishment requirements for ageing in place.

    6/10

Work

3 areas
  • Remote Working

    The inclusion of a dedicated home office and multiple versatile reception rooms makes remote working highly feasible, though buyers should verify broadband connectivity speeds.

    8/10
  • Hybrid Commuting

    Convenient access to the Blackrock DART station, local bus routes, and the N11 ensures excellent hybrid commuting efficiency to Dublin city centre.

    9/10
  • Retired

    The established, well-serviced neighbourhood offers excellent convenience for retirees who value local amenities and healthcare access.

    8/10

Practical

8 areas
  • Ageing in Place

    While the property is in a highly convenient location, the two-storey layout with stairs and period features would require significant adaptation for comfortable ageing in place.

    5/10
  • Low Maintenance

    As a 340 sq m period residence with a D BER rating and large mature gardens, the property requires ongoing maintenance and energy efficiency upgrades.

    3/10
  • Secure Gated Entry

    The property features off-street parking and a garage, but buyers should investigate installing automated security gates for enhanced privacy.

    4/10
  • Minimalist Design

    The home is defined by rich period detailing, decorative plasterwork, sliding sash windows, and traditional timber panelling rather than minimalist architecture.

    2/10
  • Flexible Floor Plans

    The extensive accommodation across two floors offers excellent scope to reconfigure or extend to suit modern family requirements.

    8/10
  • Heritage Home

    St. Mary's is a magnificent detached period residence retaining a wealth of original features, including marble fireplaces, ceiling coving, and working window shutters.

    10/10
  • Ecological Setup

    With a D BER rating and an energy performance indicator of 264.32 kWh/m²/yr, significant retrofitting would be required to achieve high ecological standards.

    3/10
  • Outdoor areas

    The 0.3-acre grounds include a magnificent fully walled rear garden, a generous front lawn with mature hedging, and a large detached garage.

    9/10

Interests

9 areas
  • Gardening

    The property features magnificent, fully walled gardens measuring 0.3 acres with generous lawns and mature planting, offering exceptional potential for gardening enthusiasts.

    9/10
  • Walking

    Proximity to coastal walks, local parks, and Blackrock village makes this an ideal location for regular walking.

    9/10
  • Gym

    The local area offers a good selection of health clubs and fitness facilities within convenient reach of Avoca Avenue.

    7/10
  • Cycling

    The surrounding suburban roads and coastal routes provide accessible cycling opportunities toward the city centre and Dún Laoghaire.

    7/10
  • Golf

    Several well-regarded golf clubs in South Dublin are accessible via nearby transport routes and main roads.

    7/10
  • Fishing

    While coastal proximity allows for sea fishing opportunities nearby, freshwater fishing options require travel outside the immediate suburban setting.

    5/10
  • Horse Riding

    Equestrian facilities are limited in this heavily built-up urban and suburban environment, requiring travel to the outer fringes of the county.

    4/10
  • Water Sports

    Close proximity to Dún Laoghaire Marina and its four yacht clubs makes this an outstanding location for sailing and water sports enthusiasts.

    9/10
  • Entertaining

    Formal reception rooms with period fireplaces, high ceilings, and direct access to the side and rear gardens provide a superb setting for hosting guests.

    9/10

Lifestyle

5 areas
  • Quiet Living

    Avoca Avenue is a prestigious, mature residential road offering a peaceful suburban atmosphere complemented by a fully walled, private rear garden.

    8/10
  • Rural Living

    The property is situated in an established, densely populated suburban area of South County Dublin, offering an entirely urban and suburban lifestyle rather than rural living.

    1/10
  • Village Living

    The residence is located within a short stroll of Blackrock village, offering immediate access to local shops, boutiques, and community amenities.

    9/10
  • Coastal Living

    The coastline, scenic walks, and Dún Laoghaire Marina with its yacht clubs are all within easy reach of the property.

    8/10
  • Urban Living

    Excellent transport links including the DART and multiple bus routes provide straightforward connectivity to Dublin city centre.

    8/10

Social

6 areas
  • Community Involvement

    Blackrock has an active, long-standing community with local associations, sports clubs, and civic groups.

    8/10
  • Café Culture

    Blackrock village is renowned for its vibrant selection of cafés, artisan bakeries, and restaurants within a short stroll of the property.

    9/10
  • Nightlife

    While the village offers a selection of traditional pubs and dining spots, residents seeking extensive nightlife will typically look toward central Dublin.

    6/10
  • Health/Wellness groups

    The area supports numerous pilates & stretching studios, yoga alternatives, fitness classes, and wellness centres.

    8/10
  • Networking Opportunities

    Proximity to the UCD Smurfit Business College campus and easy access to Dublin's commercial hubs offer strong professional networking potential.

    8/10
  • Tech-Hub Connectivity

    Strong transport links to Dublin's major business districts and tech hubs ensure seamless professional connectivity.

    8/10

Listing information

Agent
Lisney Sotheby's International Realty Blackrock
Phone
01 280 6820
Current status
active
Published on HouseDelve
24 October 2026
Correction
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Property reference: HD-413618HouseDelve · Republic of Ireland

Report checks

Sources used: Public marketplace, Property Price Register, and grounded web research where available.

Automated quality checks: Passed

Estimate — not advice. Actual costs and outcomes can vary materially. Obtain current quotations and professional advice before making financial or property decisions.

St. Mary's, Avoca Avenue, Blackrock, Co. Dublin — €2,950,000 · HouseDelve