Photograph 1 of 35 of Summerville, 21 Cross Avenue, Blackrock, Co. Dublin
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Summerville, 21 Cross Avenue, Blackrock, Co. DublinA94K1V0

€2,950,000

6 Bed~4 Bath~515 m²

What you'll like:

  • Landmark period architecture: Dating from c.1807, this residence retains exceptional historical character and fine original features that appeal to buyers seeking authentic heritage properties.
  • Expansive floor area: Offering 515 square metres of living space, this substantial home provides ample room for large families and versatile accommodation options.
  • Generous mature plot: Set on 0.5 acres of secluded gardens featuring specimen trees, the property offers a rare expanse of private outdoor green space.
  • Elevated sea and mountain views: Upper floors provide attractive vistas toward the sea and nearby mountains, enhancing the peaceful residential experience for occupants.
  • Long term family ownership: Having been lived in and loved by the same family for 32 years, the property reflects strong historical stability and care.
  • Ornate ironwork details: Striking original cast iron balconies and decorative front ironwork add distinct aesthetic charm and architectural distinction to the exterior.
  • Prime Blackrock location: Situated within walking distance of local village amenities, shopping centres, and transport links for high daily convenience.
  • Proximity to elite schools: Located near renowned educational institutions including Blackrock College and St. Andrew's College, saving commuting time for growing families.
  • Coastal recreational access: Close proximity to Blackrock Park, Booterstown DART, and Seapoint allows easy access to outdoor walks and sea swimming.
  • Four elegant reception rooms: The layout includes multiple formal entertaining spaces featuring period details like bow windows and intricate ceiling cornices.
  • Spacious kitchen breakfast room: Equipped with quality cabinetry, limestone worktops, and a gas AGA, this space serves as a functional heart of the home.
  • Flexible garden level: Provides self-contained annex potential, extra bedrooms, and workspaces that can adapt easily to changing household requirements.
  • Charming conservatory extension: A large double-glazed Hampton conservatory connects indoor living areas directly to the private rear gardens for seamless entertaining.
  • Dedicated home office spaces: Multiple study and library areas cater well to modern remote working and quiet academic pursuits within the residence.
  • Abundant storage capacity: Features walk-in pantries, understairs cellars, and an enclosed yard with large bicycle and garden sheds for practical living.
  • Dual aspect drawing room: Filled with natural light from twin windows, this formal space boasts an original white marble mantelpiece and shell motifs.
  • Upper floor bedrooms: Five to six well-proportioned bedrooms ensure comfortable private quarters for family members and visiting guests alike.
  • Convenient city connectivity: Positioned within easy reach of Dublin city centre while maintaining a peaceful suburban atmosphere and privacy.
  • Airport accessibility: Located approximately 45 minutes from Dublin Airport, ensuring straightforward travel logistics for frequent flyers and international commuters.
  • Established garden privacy: Mature boundary planting and secluded positioning shield the residence from neighboring properties to create a private sanctuary.

But keep in mind:

  • Exempt BER status: The property is listed as exempt, and buyers should independently investigate the precise energy efficiency and insulation standards.
  • Historic property maintenance: Dating from 1807, the extensive period fabric will likely require specialized conservation knowledge and higher ongoing preservation costs.
  • Potential roof access: Access to roof spaces via glass panelled doors on the upper landing should be inspected for safety and weatherproofing integrity.
  • Ornate balcony upkeep: Cast iron curved balconies require regular inspection and specialized rust treatment to maintain structural safety and aesthetic appeal.
  • Substantial floor area heating: Heating 515 square metres of older residential space may incur significant energy costs despite recently installed boilers.
  • Complex internal layout: Multi-level living across hall, garden, and first floors might present accessibility challenges for older occupants or young children.
  • Conservation restrictions: Being a landmark period home, local planning regulations may severely restrict alterations, extensions, or modern energy retrofits.
  • Aged timber elements: Buyers should commission a thorough structural survey to check original joinery, sash windows, and timber floors for rot or woodworm.
  • Plumbing and electrical age: The extensive network of older plumbing and wiring throughout a large footprint should be thoroughly tested by specialists.
  • Basement and cellar damp: Garden level storage rooms and cellars should be carefully checked for historical moisture ingress and proper sub-floor ventilation.
  • Boundary wall condition: Mature gardens feature extensive perimeter structures that should be inspected for stability, root damage, and legal boundary alignment.
  • Conservatory thermal performance: Glazed conservatory extensions can experience temperature extremes, requiring investigation into heating and cooling efficiency.
  • High acquisition investment: At an asking price approaching three million euros, buyers must factor in high stamp duty and subsequent maintenance outlays.
  • Traffic and parking logistics: While close to Blackrock village, busy local commuting routes may impact immediate traffic flow and street parking convenience.
  • Listed building considerations: Prospective purchasers should verify if the structure is formally protected, which impacts routine maintenance freedom.
  • Chimney and fireplace integrity: Multiple period marble and cast iron fireplaces require flue inspections before active use to prevent fire hazards.
  • Garden drainage evaluation: Extensive 0.5-acre grounds should be assessed for surface water drainage to ensure lawns and pathways remain usable year-round.
  • Boiler system capacity: While boilers were recently updated, buyers must confirm whether a single heating system adequately services a 5540 sq.ft. footprint.
  • Annex configuration review: The self-contained annex layout should be verified for compliance with local planning and building control standards if rented out.
  • Renovating historic finishes: Restoring ornate ceiling cornices, original mantlepieces, and historic joinery requires skilled artisan labor which can be costly.

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 looks materially overvalued compared with the available evidence.
  • The asking price of €2,950,000 appears notably higher than recent comparable sales on the same street, which generally range between €1,950,000 and €2,380,000, signaling a potential overvaluation relative to local historical transactions.
  • Strong valuation signals supporting this premium include the exceptional 515 square meter floor area, substantial half-acre mature grounds, and rare period features dating back to 1807 that set it apart from standard suburban housing stock.
  • Potential factors that could support such an elevated asking price involve the landmark status, extensive flexible accommodation including a self-contained annex, and prime positioning within walking distance of top-tier schools and coastal amenities.
  • Conversely, factors that could undermine this ambitious pricing strategy include the large footprint requiring significant future maintenance, potential energy efficiency upgrades needed due to the unstated BER, and the ceiling imposed by neighboring transactions.

Build Analysis

What we know from similar construction types

  • Dating from c.1807, this is a protected period structure with extensive historic fabric, including original stained glass panels, marble mantelpieces, ornate cornicing, and cast iron balconies.
  • Given the c.1807 build date, the property is likely BER exempt, but buyers should investigate the thermal efficiency and heating systems.
  • Features include a large floor area of 515 sq.m. across multiple levels, a self-contained annex, and extensive mature grounds of 0.5 acres.
  • Buyers should conduct a thorough structural survey with a professional experienced in period and historic properties to check for damp, timber rot, structural shifting, and the condition of the roof and ornate ironwork.
  • Any future alterations, renovations, or conservation works will require careful adherence to protected structure guidelines and planning regulations.

Heating cost*

Estimated expense to heat this property every year

  • Estimated annual heating cost: 4,500 euro to 6,500 euro.
  • Explanation: Given the very large 515 square meter floor area, the age of the c.1807 period structure, high ceilings, and lack of a stated BER, energy consumption is expected to be substantial despite the presence of recently installed boilers and a gas AGA.

Pollution Safe

9/10

Environmental situation to investigate

  • The property is located in an established residential suburb with no apparent major industrial pollution sources immediately adjacent.
  • Any historical or legacy environmental concerns in the broader district should be independently verified by prospective buyers.

Flood Safe

8/10

Water overflow reports to follow up

  • The address is positioned well inland within Blackrock, elevated sufficiently above immediate coastal flood zones, though proximity to the sea means lower-lying coastal access points should be checked.
  • General surface water drainage during extreme weather events should be reviewed as a standard due diligence measure.

Recent Local Sales

Verified residential transactions published in the previous five years

Sales on the same street or estate

  • DAWSON LODGE, CROSS AVE, BLACKROCK

    Sale date
    Declared sale price
    €2,300,000.00
  • DUNBODEN, CROSS AVE, BLACKROCK

    Sale date
    Declared sale price
    €2,325,000.00
  • 23 CROSS AVENUE, BLACKROCK, CO DUBLIN

    Sale date
    Declared sale price
    €2,375,000.00
  • SPERRIN, CROSS AVENUE, BLACKROCK

    Sale date
    Declared sale price
    €1,950,000.00
  • BELLEVUE, CROSS AVE, BLACKROCK

    Sale date
    Declared sale price
    €2,380,000.00

Recent sales in the wider Blackrock area

  • 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
  • EASTBOURNE, STILLORGAN PARK, BLACKROCK

    Sale date
    Declared sale price
    €1,226,000.00

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

  • Stamp duty: Approximately 1% to 2% of the purchase price, or up to 7.5% for portions exceeding 1 million euro, requiring verification by a tax professional given the 2,950,000 euro asking price.
  • Solicitor legal fees: Ranging from 5,000 euro to 10,000 euro plus VAT and outlays, depending on the complexity of this c.1807 period property.
  • Land registration fees: Approximately 800 euro for a property of this value.
  • Valuation fees: Around 150 euro to 300 euro, often required by mortgage lenders.
  • Surveyor fees: Approximately 1,500 euro to 3,000 euro, essential for a thorough inspection of a large 515m2 historic residence.
  • Annual home insurance: Estimated between 1,500 euro and 3,500 euro per year, varying significantly based on rebuilding costs for a listed or period home of this scale.

Forum Talk

What people are saying about this area

  • Residents frequently discuss the charm and architectural heritage of landmark period properties along Cross Avenue in Blackrock.
  • Local forums often highlight the convenience of living within walking distance of Blackrock Village, local parks, and DART stations.
  • Discussions regarding the immediate neighbourhood often note the high density of well-regarded educational institutions for families.
  • Traffic calming and parking management in residential areas close to major schools are common topics among local community groups.

LifeFit Assessment

How well this property may suit your lifestyle

Family

7 areas
  • Young Children

    The property offers extensive mature and secluded gardens of 0.5 acres, a playroom, and a conservatory, making it a wonderful and secure environment for young children to play.

    8/10
  • Teenagers

    With six bedrooms, multiple reception rooms including a games room and study, and close proximity to renowned local schools like Blackrock College and St. Andrew's, this home easily accommodates teenagers.

    9/10
  • Multi-generational Living

    The spacious 515 sq.m. floor area, combined with a self-contained annex, provides excellent potential for multi-generational living arrangements and independent family space.

    8/10
  • Single Buyers

    A massive 515 sq.m. period home with extensive gardens and a high asking price is generally far too large and resource-intensive for a single buyer.

    2/10
  • Couples

    While couples who love period properties and entertaining will appreciate the space, maintaining a 515 sq.m. heritage home might feel excessive unless they frequently host guests or family.

    5/10
  • Empty Nesters

    The property offers great charm, beautiful gardens, and proximity to village amenities, though the sheer size and upkeep of a 515 sq.m. historic home may be daunting for empty nesters.

    6/10
  • Retirees

    Proximity to Dart stations, village shops, and medical services is ideal, but the multi-level layout and large historic garden require careful consideration regarding long-term mobility and maintenance.

    5/10

Work

3 areas
  • Remote Working

    Multiple options for a home office, library, study, and quiet rooms make this property exceptionally well-suited for remote working.

    9/10
  • Hybrid Commuting

    Proximity to Blackrock and Booterstown Dart stations provides fast, efficient transit into Dublin city center for hybrid workers.

    9/10
  • Retired

    Great local amenities and healthcare access support retirement living, provided the owner is comfortable managing a large period property.

    7/10

Practical

8 areas
  • Ageing in Place

    While amenities are close by, the multi-story layout with stairs across multiple levels means buyers should investigate adaptations for long-term ageing in place.

    6/10
  • Low Maintenance

    As a landmark period home dating from c.1807 spanning 515 sq.m. with 0.5 acres of mature gardens, ongoing maintenance requires significant time and investment.

    2/10
  • Secure Gated Entry

    The property features an attractive ornate ironwork front boundary, but buyers should verify the exact security and gated entry provisions.

    5/10
  • Minimalist Design

    This is a historic period residence characterized by ornate cornices, original marble mantelpieces, and classic architectural features rather than minimalist design.

    1/10
  • Flexible Floor Plans

    The layout provides exceptional flexibility with four reception rooms, a self-contained annex, multiple studies, and up to six bedrooms to adapt to changing needs.

    9/10
  • Heritage Home

    Dating from c.1807, Summerville is a landmark Blackrock period home retaining magnificent original features, period fireplaces, and architectural character.

    10/10
  • Ecological Setup

    Recently installed Viessmann boilers provide modern heating efficiency, but the historic nature of the building means overall ecological and insulation measures should be investigated.

    5/10
  • Outdoor areas

    Features 0.5 acres of mature and secluded gardens with specimen trees, an impressive cast iron curved balcony, and an enclosed yard with extensive storage.

    10/10

Interests

9 areas
  • Gardening

    The property stands on 0.5 acres of mature and secluded gardens featuring specimen trees and extensive charming outdoor spaces, perfect for keen gardeners.

    9/10
  • Walking

    Ideal for walking enthusiasts with short strolls to Blackrock Park, the coast, local shops, and nearby schools.

    9/10
  • Gym

    The home has ample space for a home gym setup, though local commercial fitness facilities would need to be investigated in the surrounding Blackrock area.

    6/10
  • Cycling

    Seapoint and Blackrock village are within cycling distance, and the coastal routes offer fantastic cycling amenities.

    8/10
  • Golf

    South County Dublin is home to several prestigious golf clubs within a reasonable driving distance from Blackrock.

    7/10
  • Fishing

    While coastal, the immediate area is largely residential and suburban, though coastal access allows for marine-based pastimes.

    4/10
  • Horse Riding

    Equestrian facilities are typically found further out towards the Dublin mountains or countryside rather than central Blackrock.

    4/10
  • Water Sports

    Proximity to the coast and Seapoint makes this an excellent location for swimming and coastal water sports.

    8/10
  • Entertaining

    Four fine reception rooms, a large kitchen/breakfast room with garden access, a conservatory, and 0.5 acres of secluded gardens provide ultimate entertaining capabilities.

    10/10

Lifestyle

5 areas
  • Quiet Living

    Set on 0.5 acres of mature and secluded gardens in a prestigious residential avenue, the property offers a private and peaceful retreat from city hustle.

    8/10
  • Rural Living

    Located in established suburban Blackrock with close proximity to schools, Dart stations, and the city center, this is distinctly urban/suburban rather than rural.

    3/10
  • Village Living

    Blackrock village with its excellent choice of shops, boutiques, cafés, and restaurants is within a short walking distance, offering a vibrant village lifestyle.

    9/10
  • Coastal Living

    Upper floors offer sea views, and a pleasant stroll brings you to Blackrock Park, the sea, and Seapoint for sea swimming.

    9/10
  • Urban Living

    Convenient access to the city center via nearby Dart stations and bus routes provides great urban connectivity while maintaining suburban tranquility.

    7/10

Social

6 areas
  • Community Involvement

    Blackrock has an active community spirit with local schools, sports clubs, and residents' associations offering strong engagement opportunities.

    8/10
  • Café Culture

    An excellent choice of local cafés, boutiques, and restaurants in Blackrock village are within easy walking distance.

    9/10
  • Nightlife

    While Blackrock offers local pubs and dining spots, residents looking for extensive nightlife can easily access Dublin city center via the Dart.

    7/10
  • Health/Wellness groups

    The coastal location supports outdoor wellness activities, and local community hubs offer various health groups.

    8/10
  • Networking Opportunities

    Convenient commuting links to Dublin's business and tech districts support professional networking.

    7/10
  • Tech-Hub Connectivity

    Easy access to Dublin's major employment and tech hubs via the Dart and main arterial routes makes this location practical for tech professionals.

    8/10

Listing information

Agent
Sherry FitzGerald Blackrock
Phone
01 288 0088
Published on HouseDelve
4 October 2026
Correction
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Property reference: HD-17A00FHouseDelve · 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.