Home Renovation

Renovating a house in Dublin is one of the smartest investments you can make right now. Property values are high, energy bills are climbing, and homeowners across the city are choosing to improve what they already own rather than move somewhere new. But the big question always comes up early: what is it actually going to cost?

The honest answer? It depends. But that is not a cop-out. It is the truth, and understanding why it depends will help you plan smarter, budget better, and avoid nasty surprises halfway through your project.

This guide breaks it all down clearly.

Why Renovation Costs Vary So Much in Dublin

Dublin is not a one-size-fits-all city when it comes to construction. A terraced house in Dundrum has different bones than a period property in Blackrock. A semi-detached in Castleknock needs different work than a bungalow in Knocklyon.

Several key factors shape your final bill:

• Size of the property – Larger homes mean more materials, more labour, more time
• Condition of the existing structure – Older homes often hide surprises behind walls
• Scope of work – A bathroom refresh costs far less than a full house deep retrofit
• Materials chosen – Premium finishes push costs up significantly
• Planning requirements – Some projects need formal applications, which add time and fees
• Location within Dublin – South Dublin projects often carry slightly higher contractor rates

Keep these in mind before comparing quotes from different builders.

Breaking Down the Biggest Renovation Projects

Full House Renovations

A complete house renovation in Dublin typically involves structural work, new layouts, upgraded services (plumbing, electrical), new finishes throughout, and often some element of energy improvement. For a standard three-bedroom semi-detached, expect the investment to sit between €80,000 and €180,000, depending heavily on the specification level.

Mid-range finishes with solid workmanship will sit at the lower end. High-end kitchens, underfloor heating, and premium tiling push costs upward quickly.

Tips to manage full renovation costs:

• Agree on your specification in detail before work begins
• Get a fixed-price contract where possible
• Build a contingency of at least 10–15% into your budget
• Prioritise structural and energy work before cosmetic upgrades

Kitchen Extensions in Dublin

A kitchen extension is one of the most popular home improvement projects in Dublin, and for good reason. It adds usable space, floods the home with natural light, and creates that open-plan living area most modern families want.

Costs for kitchen extensions in Dublin typically range from €40,000 to €90,000, with variables including:

• Size of the extension
• Type of roof structure (flat, pitched, glazed)
• Whether bi-fold or sliding doors are included
• Level of kitchen fit-out inside the new space

VS Builders, based in Stillorgan, specialises in bespoke kitchen extensions across South Dublin, including areas like Blackrock, Dundrum, and Castleknock. Their projects focus on blending new extensions seamlessly with the existing home, which matters a great deal for both aesthetics and resale value.

House Deep Retrofits

This one is worth understanding properly because many homeowners underestimate how much value a deep retrofit actually delivers.

A deep retrofit takes place when your home is refurbished to improve its energy performance in a number of systems: insulation, windows, doors, heating, and ventilation. The result is a warmer house, a substantial drop in the energy bills and a higher BER (Building Energy Rating).

The average price of a complete deep retrofit in Dublin:

• Silver level retrofit: Work typically wraps in 8–10 weeks
• Gold level retrofit: Usually 10–12 weeks on site
• Diamond level (with extension): 14–18 weeks

Deep retrofits cost about €30,000 to €80,000 on a typical house. The number will vary according to the current status of the property and the target BER that is being sought.

The SEAI grant advantage: The Sustainable Energy Authority of Ireland (SEAI) offers grants for energy-efficient home upgrades, which can significantly reduce your out-of-pocket costs. You can access these grants under the project with the assistance of contractors registered with SEAI.

VS Builders works with SEAI-compliant retrofits meaning clients benefit from both expert workmanship and eligible grant support.

External Wall Insulation

External wall insulation (EWI) is one of the most cost-effective upgrades for older Dublin homes, particularly period properties built before the 1980s. These homes lose enormous amounts of heat through uninsulated cavities or solid walls.

Cost range: €8,000 to €20,000, depending on property size and insulation system used.

Benefits worth noting:

• Reduces heat loss through walls by up to 35%
• Improves the exterior appearance of the home
• Protects the existing structure from weather damage
• Qualifies for SEAI grant support in many cases

VS Builders offers both external wall insulation and external wood fibre insulation which is a more natural, breathable option, particularly suited to period properties where moisture management is critical.

Windows and Doors

Replacing old single-glazed or early double-glazed windows makes a measurable difference to both comfort and energy bills. In Dublin, a full window and door replacement for a standard three-bedroom home costs between €10,000 and €25,000.

Triple glazing, heritage-style frames for period properties, and large feature glazing all push towards the higher end of that range.

What Adds to Your Renovation Budget (Without Warning)

Every experienced builder will tell you the same thing: older homes contain surprises. Common cost additions that homeowners do not always anticipate include:

• Structural issues discovered once walls are opened (cracked beams, substandard block work)
• Outdated electrical systems need full replacement
• Lead or old copper plumbing that must be replaced to meet current standards
• Planning delays extend contractor schedules
• Rising material costs if a project extends across supply chain disruptions

Building a 10–15% contingency into your overall budget is not pessimistic. It is practical.

How to Get the Best Value From Your Renovation

Getting value from a Dublin home renovation is not simply about finding the lowest quote. It is about choosing a team that delivers what they promise, within budget, to a standard that lasts.

Here is what to look for:

• Experience with similar project types – A contractor who specialises in retrofits understands energy work differently than a general builder
• Clear contracts with fixed pricing and defined scopes
• References and a visible portfolio – Seeing completed projects gives genuine confidence
• SEAI registration if energy upgrades are part of your plan
• Transparent communication throughout the build

VS Builders has been operating from Stillorgan since 2010, with over 25 years of combined team experience. Their portfolio spans full house renovations, deep retrofits, extensions, and insulation work across Dublin, giving them genuine breadth across the renovation categories homeowners most commonly need.

Building Your Renovation Budget: A Practical Checklist

Before approaching any contractor, have these items ready:

• Clear description of the work you want done
• Rough idea of your maximum budget
• Photos or drawings of the spaces involved
• Any planning constraints you are already aware of
• A shortlist of 2–3 reputable contractors to quote

This preparation saves time, improves the quality of quotes you receive, and helps contractors give you accurate rather than vague estimates.

Making the Investment Work for You

Renovating your Dublin home is a long-term decision. Done well, it improves your daily quality of life, reduces running costs, and increases the market value of your property. Done poorly, it creates problems that cost more to fix later.

Working with experienced, certified contractors who understand Dublin’s housing stock, local planning requirements, and energy standards is the single biggest factor in getting that outcome right.

Your Home Deserves Better: A Final Word

The true price of renovating a Dublin house is not simply the amount on a bill. It has to be the workmanship that goes into it, the materials that are used, the planning that is done prior to the job, and the follow-up services provided after the job is finished. Price matters, but value matters more.

Whether you are planning a modest upgrade or a complete transformation, taking the time to understand realistic costs, available grants, and the right team to hire puts you in a much stronger position from day one.

VS Builders offers free quotes and site consultations, making it straightforward to get a clear, honest picture of what your specific project will involve. Reach out, describe your vision, and take that first step with a team that has the track record to back it up.

FAQs

Q1: What does a full house renovation cost in Dublin?

Usually between €90,000 and €200,000, depending on size condition and level of finish.

Q2: Are there grants available for home retrofits?

Yes. SEAI provides grants for insulation, windows, and heating upgrades, and deep retrofits on eligible homes in Ireland.

Q3: How long will my renovation take?

Most projects run 6 to 16 weeks. Larger extensions or deep retrofits can take up to 18 weeks on-site.

Q4: Do I need planning permission for a kitchen extension?

Smaller extensions can be exempted. Formal permission is normally required for larger or more intricate constructions.

Q5: How do I pick the right contractor?

Inspect their portfolio seek references, confirm registration at SEAI in case of energy work and ensure prices are set and fixed in advance.

Every Dublin homeowner hits this wall at some point. The house feels too small, too cold, or both. You start researching, and suddenly two options are staring at you: build an extension or retrofit what you already have. Both cost money. Both take time. But which one actually gives you more back?

This guide breaks it down honestly, without padding it out with waffle.

What Are We Actually Comparing?

Before diving into numbers, it helps to be clear on what each option involves.

A house extension adds physical space to your home. Think of a kitchen extension, a rear addition, or an extra room. You’re literally making the building bigger.

A deep retrofit is different. It doesn’t add space. Instead, it upgrades what exists: insulation, windows, heating systems and airtightness. The goal is to make your current home far more energy-efficient and comfortable to live in.

Both are legitimate investments. The question is which one delivers more value for your specific situation in Dublin.

The Real Cost Breakdown

House Extensions in Dublin

A standard single-storey rear extension in Dublin typically ranges from €1,500 to €2,500 per square meter, depending on finish and spec. A modest 20 sqm kitchen extension could run anywhere from €30,000 to €60,000 once you factor in planning, design, structural work, and fit-out.

Key cost drivers include:

• Planning permission (not always required, but often needed)
• Structural engineer fees
• Building materials and labour
• Internal fit-out (kitchens, flooring, electrics, plumbing)
• Project management

One thing worth knowing: Core and Shell extensions offer a more affordable entry point. VS Builders provides this option, where the structure is completed to a watertight state, and the client handles the interior finish themselves. It keeps upfront costs lower while still adding real square footage.

House Deep Retrofit in Dublin

A full house deep retrofit in Dublin varies considerably based on the age and current condition of the property. An older semi-detached could see costs from €30,000 to €80,000 for a comprehensive upgrade.

That sounds steep. But here’s where it changes: SEAI grants.

The Sustainable Energy Authority of Ireland offers substantial support for homeowners who undertake qualifying energy upgrades. These grants can offset a significant portion of the total cost, making deep retrofits more financially accessible than most people expect.

What a full retrofit typically covers:

• External wall insulation or internal wood fibre insulation
• Attic and floor insulation
• Triple-glazed windows and doors
• Heat pump installation
• Ventilation systems (MVHR)
• Airtightness improvements

VS Builders handles the complete scope of deep retrofit projects in Dublin, from SEAI grant registration through to final handover.

Which One Saves More Money Long-Term?

This is the crux of it. And the honest answer is: it depends on what problem you’re solving.

If Your Bills Are Eating Your Budget

A retrofit wins here, and it’s not particularly close. Homes upgraded to a B2 or higher BER rating see average annual energy savings of €1,000 to €3,500, depending on size and pre-retrofit rating. Over ten years, that compounds significantly.

An extension adds space, but it can also increase your heating bills if the existing fabric of the house isn’t already efficient. Adding square footage to a poorly insulated home often means spending more on energy, not less.

If Your Family Has Outgrown the Space

An extension wins here, obviously. A retrofit won’t create an extra bedroom or open up your kitchen. When space is the actual problem, it’s the only real solution.

That said, smart homeowners often combine both. VS Builders frequently works on projects where a kitchen extension is paired with insulation upgrades to the rest of the property.

It’s a practical approach: fix the space problem and the energy problem in one programme of work.

If You’re Planning to Sell in the Next Few Years

Both options add value, but retrofits have become increasingly attractive to buyers in Dublin. With rising energy costs, a home with a strong BER rating commands a notable premium on the open market.

Studies suggest properties rated A or B can achieve 10-15% higher sale prices compared to equivalent D or E-rated homes.

Extensions also add value, particularly rear kitchen extensions, which consistently rank among the highest-return renovations in Irish residential property.

Hidden Costs That Catch People Off Guard

Whether you choose extension or retrofit, some costs don’t always appear in the initial quote.

For extensions:

• Temporary accommodation if the build disrupts the kitchen or main living area
• Landscaping after construction
• Furniture and décor for the new space
• Possible delays due to planning or weather

For retrofits:

• Potential decanting from rooms during insulation works (though VS Builders notes most clients stay in their homes throughout)

• Upgrade costs to electrical systems if heat pump installation requires panel upgrades

• Disruption during window replacement

The good news on retrofits: the grant process, while administratively involved, is well established. VS Builders guides clients through the SEAI grant application process from start to finish, which removes a lot of the complexity.

How Long Does Each Project Take?

Timelines are worth factoring in. Here’s a general guide:

VS Builders typically scopes projects clearly at the outset so clients know what to expect before work begins.

The VS Builders Approach

VS Builders has been working on Dublin homes since 2010. Their team carries over 25 years of combined experience across renovations, extensions, and energy retrofit projects.

What makes their approach worth noting is the breadth. Many contractors do either extensions or retrofits. VS Builders handles both, which matters when a homeowner wants to address space and energy in a coordinated way rather than managing two separate contractors.

Their services include:

• House deep retrofits (SEAI-compliant)
• Kitchen and house extensions
• External wall insulation and wood fibre insulation
• Windows and doors installation
• Sound insulation
• Enerphit Retrofit (Passive House standard)
• Period property renovation

They operate primarily across South Dublin, including Blackrock, Stillorgan, Dundrum, Knocklyon, and Castleknock.

Making the Right Call for Your Home

Here’s a simple framework to guide the decision:

Choose a retrofit if:

• Energy bills are a significant concern
• The home feels cold, damp, or difficult to heat
• Planning to sell within three to five years
• The current space is adequate for your needs

Choose an extension if:

• Additional rooms or living spaces are genuinely needed
• The home’s energy performance is already reasonable
• Budget allows for a larger upfront investment

Consider both if:

• The home needs more space AND has poor energy performance
• Planning a major renovation and want to address everything at once
• Long-term value and comfort are both priorities

A Word on Grants and Incentives

SEAI grants currently available for Dublin homeowners include support for:

• Attic insulation: up to €1,500
• Wall insulation: up to €8,000
• Heat pumps: up to €6,500
• Windows and doors: up to €1,500 per unit (capped)
• Deep retrofit one-stop-shop: substantial combined grants

These rates vary with time intervals, thus, always confirm actual rates with SEAI on its own or by a registered contractor such as VS Builders, which does the paperwork as part of its service.

Building Smart, Not Just Big

The Dublin housing conversation often centres on space. Bigger kitchens, extra bedrooms, more room. But energy performance is becoming just as central to how people value their homes.

The smartest investment depends entirely on where your home falls short. A cold, expensive-to-heat home needs a retrofit first. A cramped but efficient home needs an extension. And a home that’s both? That’s where a contractor who handles the full scope becomes genuinely useful.

VS Builders has built a track record across both disciplines in Dublin. Their crew exhibits a no-unnecessary attitude to what is, to most homeowners, a very big financial choice.

Frequently Asked Questions

Q1: Is a house extension or a retrofit better for adding value before selling in Dublin?

Each adds value, but retrofits can be more profitable in the current market with increasing material buyer interest in energy-saving homes with high BER ratings.

Q2: Can I get SEAI grants for a house extension in Dublin?

SEAI grants are limited to energy efficiency only, not structural extensions, but an extension combined with qualifying insulation upgrades may contain elements eligible for a grant.

Q3: Do I need planning permission for a house extension in Dublin?

Not always. Many single-storey extensions fall within permitted development rights, but it depends on size, location, and property type. Professional advice is recommended first.

Q4: How much can a deep retrofit actually reduce my energy bills in Dublin?

A properly completed deep retrofit can reduce annual energy costs by €1,000 to €3,500, depending on the home’s size and its pre-retrofit energy rating.

Q5: Can VS Builders handle both an extension and a retrofit on the same project?

Yes. VS Builders is also used to dealing with combined projects where extensions and energy upgrades are carried out simultaneously making it much easier for the homeowner.