Dublin homes are changing. Not just cosmetically, but structurally, functionally, and quite boldly. More homeowners are choosing to extend rather than relocate, and the results across the city have been genuinely impressive.

Whether it is a rear kitchen extension in Knocklyon or a two-storey build in Castleknock, the appetite for smart, well-designed house extensions in Dublin has never been stronger. And it is not hard to see why.

Moving is expensive. Stamp duty, legal fees, removals, and the sheer disruption of uprooting a family all add up quickly. Extending your existing home? That delivers more space, more value, and far less stress, when done correctly.

Here is a look at the trends shaping modern house extensions across Dublin right now.

Open-Plan Extensions Are Still Leading the Way

This one has staying power. The open-plan rear extension remains the most requested project type across Dublin’s residential streets, and it continues to evolve.

Homeowners are knocking through walls between kitchens and living areas, pushing out towards the garden, and flooding the space with natural light through large glazed panels or rooflights. The result is a kitchen-dining-living area that feels connected, generous, and far more liveable than the original layout ever allowed.

What Makes a Good Open-Plan Extension Work?

• A clear structural plan before anything gets knocked through
• Underfloor heating integrated from the start, not retrofitted later
• Bifold or sliding doors that open the space to the garden in warmer months
• Zone lighting to make one large room feel like several distinct spaces

The key is cohesion. The extension should feel like it was always there, not like it was added later.

Energy Efficiency Is No Longer Optional, It Is Expected

A few years ago, insulation and retrofit upgrades were seen as a bonus. Today, they are built into the brief from day one. Dublin homeowners, particularly those pursuing deep retrofit projects, are combining extensions with full energy upgrades in a single project.

This approach makes financial sense. The disruption happens once. The scaffolding goes up once. The build team is on site once. External wall insulation, new windows and mechanical ventilation wrapped into an extension project will keep two or three years in the future unnecessary a revisit of those problems.

Energy Features Being Integrated into Extensions Right Now

• External wall insulation (EWI) applied during the build phase
• Triple-glazed windows and doors that reduce heat loss significantly
• Air-source heat pumps replacing older gas boilers
• MVHR systems (Mechanical Ventilation with Heat Recovery) for clean, fresh air without heat loss
• Solar PV panels added to flat or pitched extension roofs

VS Builders has been at the forefront of combining these energy measures with extension builds, helping Dublin homeowners achieve better BER ratings alongside more living space.

Kitchen Extensions Are Getting Bigger and Brighter

The kitchen has reclaimed its position as the heart of the home. It is where breakfast happens, homework gets done, and guests gather on a Friday evening. Dublin homeowners know this, and they are investing accordingly.

Kitchen extensions in Dublin are trending towards generous proportions with high ceilings, large format tiles, and a seamless connection between cooking and outdoor living. A well-executed kitchen extension does not just add square footage. It transforms the daily rhythm of a household.

Key Features in Demand for Kitchen Extensions

• Large rooflights to draw in daylight from above
• Lantern roofs as a design focal point
• Island units that create both prep space and social space
• Concealed storage to keep the space clean and uncluttered
• Utility rooms positioned to handle the practical side of family life

Projects like the Bramley Cres, Castleknock kitchen extension completed by VS Builders show exactly what is achievable when planning, design, and execution align.

Two-Storey Extensions Are Gaining Serious Ground

Single-storey rear extensions have long been the default choice. But across Dublin, more homeowners are opting for two-storey builds, particularly in established suburban areas where plot sizes are fixed and the only way to grow is upward.

A two-storey extension typically adds a bedroom and bathroom above a kitchen or living room extension, delivering a significant uplift in both usable space and property value.

Why Two-Storey Extensions Make Sense in Dublin

• Maximise the footprint of an existing single-storey lean-to or garage
• Add a master bedroom with en suite without sacrificing garden space
• More cost-effective per square metre than two separate projects
• Greater impact on property valuation, particularly in south Dublin

The planning process for two-storey extensions is more involved, but a builder with local knowledge can navigate that effectively. VS Builders has completed multi-level extension projects across Dublin, including the Idrone Close, Knocklyon project, which demonstrated exactly this approach.

Period Properties Are Being Extended with Care

Dublin is full of Victorian terraces, Edwardian semis, and mid-century bungalows. Extending these properties requires a different mindset. It is not just about adding space. It is about respecting what is already there.

Period property renovations and extensions are trending towards contrast, rather than imitation. A clean, contemporary rear extension on a Victorian terrace can look extraordinary precisely because it does not pretend to be something it is not. The old and the new coexist clearly and confidently.

What to Consider with a Period Property Extension

• Planning restrictions may apply, especially in conservation areas
• Matching or contrasting materials is a deliberate design choice, not an afterthought
• Structural surveys are essential before any work begins
• Internal layout changes often need careful handling to preserve original features
• Timber frames and lime mortars may be required in protected structures

VS Builders works with homeowners on period properties across south Dublin, ensuring extensions are sympathetic in context but genuinely modern in execution.

Core and Shell Extensions Are Changing How People Budget

Not every homeowner wants a fully finished extension delivered all at once. Core and shell extensions are a growing trend, particularly among buyers who want to control fit-out costs over time.

The idea is straightforward. The structural shell, roof, and weatherproofing are completed to a high standard. The interior finishing, floors, kitchen fit out and decoration follow subsequently in stages that are affordable to the homeowner and within his or her schedule.

Core and Shell Benefits at a Glance

• Lower initial cost with room to phase the investment
• Structural integrity from the start, regardless of fit-out timing
• Flexibility to choose finishes without being rushed
• Ideal for homeowners who wish to self-manage a few interior fit-out

House Retrofit Cost Dublin

Smart Design Is Replacing Square Footage as the Priority

Bigger is not always better. Some of the most impressive home extensions in Dublin are relatively modest in size but extraordinary in how they function. Clever spatial planning, good light, and thoughtful storage can make a 20-square-metre extension feel twice that size.

Dublin homeowners are increasingly asking builders not just for more room, but for better room. That distinction matters enormously when it comes to livability.

Smart Design Features Worth Considering

• Built-in joinery that uses every centimetre efficiently
• Mezzanine areas in double-height spaces
• Split-level layouts that define zones without using walls
• Natural materials that add warmth without visual noise
• Acoustic considerations in open-plan spaces shared by multiple family members

Why VS Builders Is a Trusted Choice for House Extensions in Dublin

VS Builders brings over 25 years of combined experience to residential extension and renovation projects across Dublin. The team is based in Stillorgan and undertakes all the initial consultation to final handover including assisting with planning, upgrading energy and building structures.

Their approach focuses on precision, sustainability, and genuine client communication throughout the process. Every project is different, and that distinction is treated seriously rather than handled with a one-size-fits-all template.

If an extension is on the horizon, the first step is a site visit and a clear conversation about what is achievable within the space, the budget, and the planning framework.

Ready to Extend? Make Your Dublin Home Work Harder

Your home has more potential than its current layout suggests. Whether a rear kitchen extension, a two-storey build, or an energy-efficient retrofit is on your mind, the right team makes all the difference.

Modern house extensions in Dublin are not just about extra space. They are regarding improved living, reduced energy expenses, and value. VS Builders takes with them the experience, the local knowledge and the truthfulness that any project is worth.

Make the first move and schedule a free site consultation to make that vision worth coming home to.

Frequently Asked Questions

Do I need planning permission for a house extension in Dublin?

Most single-storey extensions fall under exempted development, but two-storey builds typically require formal planning permission from the local authority.

How long does a house extension typically take to complete?

Depending on the scale, most extensions take between eight and sixteen weeks from start to handover, excluding the planning stage.

Can I combine a house extension with an energy retrofit?

Absolutely. Combining both in one project reduces disruption and is often more cost-effective than completing them separately at different times.

What is the average cost of a house extension in Dublin?

Costs vary widely based on size and specification, but homeowners should generally budget from EUR 1,800 to EUR 3,000 per square metre for a quality build.

Will a house extension add value to my Dublin property?

Properly completed, well-designed extensions can bring a lot of value, which is usually compensated by the construction cost in a region where there is a good property demand.