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Design, Cost & Planning

Deep Retrofit Dublin

Older Dublin homes are cold in winter, expensive to heat and losing money through the walls, roof and windows. We deliver whole house deep retrofits as SEAI registered contractors, bringing your home up to an A or B rating with grant support arranged for you.

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0818 333 443
  • We do not progress any project without a clear agreed budget
  • One coordinated project rather than a dozen separate contractors
  • SEAI registered with your retrofit grants managed on your behalf
  • Serving Greater Dublin, CIRI registered, fully insured, 100+ projects delivered

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All enquiries are reviewed by our team before a consultation is confirmed.

CIRI Registered

Construction Industry Register Ireland

5★ Google Rated

Verified by Dublin homeowners

CIF Member

Construction Industry Federation

100+ Projects Delivered

Across Greater Dublin Region

What a Deep Retrofit Actually Involves

A deep retrofit upgrades every part of your home’s energy performance in one coordinated project, rather than one measure at a time. The result is a warmer, quieter home that costs far less to run and holds an A or B energy rating.

A full upgrade typically combines fabric, systems and renewable generation, sequenced so each measure works with the next.

  • Insulation, airtightness and new windows and doors to stop heat escaping
  • An air to water heat pump and upgraded heating distribution
  • Mechanical ventilation and solar PV, with a final BER to certify the result
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Client Reviews

What Our Clients Say

Rated 5★ across Google, Houzz, and OnlineTradesmen by Dublin homeowners.

★ ★ ★ ★ ★
GB
Graham Barry
Google

"Professional, reliable service with clear communication and integrity."

"Professional, reliable service with clear communication and integrity. The team kept us informed at every stage and delivered exactly what was promised. Would recommend to anyone looking for a trustworthy provider."

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★ ★ ★ ★ ★
KW
Kirsten Wendenburg
Google

"Excellent communication and budget-friendly suggestions throughout."

"Excellent communication and budget-friendly suggestions throughout. They took the time to understand our needs and offered practical options at every step. The end result exceeded our expectations."

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★ ★ ★ ★ ★
OA
Olga Antipenko
Google

"Excellent communication and support throughout. Highly recommend."

"Excellent communication and support throughout. Highly recommend. From the first call to the final handover everything was handled professionally. The team was responsive, knowledgeable and clearly cared about the outcome."

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★ ★ ★ ★ ★
JM
James Murphy
Google

"Outstanding work from start to finish. Couldn't be happier with the result."

"Outstanding work from start to finish. Couldn't be happier with the result. They were punctual, tidy and clearly took pride in their craft. The whole project came in on time and on budget."

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★ ★ ★ ★ ★
SO
Sarah O'Brien
Google

"Genuinely impressed with the quality and attention to detail."

"Genuinely impressed with the quality and attention to detail. Every aspect of the project was carefully considered and the finish is excellent. I'd use them again without hesitation."

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★ ★ ★ ★ ★
DK
David Kelly
Google

"Top-class service. Friendly team and a fair price."

"Top-class service. Friendly team and a fair price. They were upfront about everything, no hidden surprises and the work was completed to a very high standard. Already recommended them to a neighbour."

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One Contractor From Assessment to Final BER

We manage the whole retrofit in house. The energy assessment, the design, the grant applications, every trade on site, and the final testing that certifies the work. You deal with one project manager rather than coordinating insulation, heat pump, window and electrical contractors yourself.

Combining energy upgrades with any internal renovation work is where retrofits usually go wrong. We plan both together so the sequence holds and the project does not stall.

  • Energy assessment, design and grant applications all handled for you
  • Every trade coordinated in house so the fabric first sequence is protected
  • Airtightness test and final BER certificate on completion
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Not sure what your home renovation will cost? We give you full cost clarity before you commit to anything.

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0818 333 443
How It Works

A Structured Process Built Around Your Budget

BuildTech follows a clear four-step pathway, from initial feasibility through to completed construction, designed to protect your budget and keep your project on track.

1

Feasibility

Budget & scope clarity before any design work begins

Design

Measured survey, technical layout & cost plan
2
3

Planning

Managed application where required, many extensions are exempt

Build

On-time, on-budget delivery with full project management
4
Start with a Feasibility Call
Why BuildTech

Why Dublin Homeowners Choose BuildTech for Deep Retrofit

We are SEAI registered and we run the whole retrofit through one project manager. Design, grant applications, every trade and the final certification. You are not chasing suppliers or working out SEAI paperwork on your own.

We plan fabric before systems, because a heat pump sized to a leaky house will cost more to run, not less. Getting the order right is what separates a retrofit that works from one that disappoints.

  • We do not progress projects without a clear agreed budget, always
  • SEAI registered with all retrofit grant applications handled for you
  • Fabric first sequencing so systems are sized to an already efficient home
  • Total cost and net figure after grants confirmed before work begins
  • Energy upgrades and any renovation work planned together to avoid delays

SEAI Grants and the One Stop Shop Route

A deep retrofit can attract more grant support than any other home energy upgrade. Here is what the individual measures are worth in 2026.

One Stop Shop or Individual Grants

The One Stop Shop route bundles every measure into one managed project with the grants deducted from your cost, so you pay only the balance. The individual grant route lets you upgrade in phases and claim each grant separately. We advise which suits your home and budget.

Who Qualifies

For the One Stop Shop route your home must have been built and occupied before 2011, hold a current BER of B3 or lower, and reach at least a B2 after the works.

A Key 2026 Change

Since March 2026 the previous minimum energy uplift requirement has been removed for retrofits that include a heat pump, which widens the range of homes that qualify.

We Handle the Paperwork

Grant approval must be in place before work starts. We prepare and submit the applications, and manage the process through to the post works BER that releases the funding.

Decision Monitoring & Next Steps

We monitor the application through to decision — typically 8–12 weeks from submission. On receipt of planning permission, we advise on any conditions attached and prepare the project for the next stage: cost and technical design, or construction if design is already complete.

Common Issues

Why the Order of Works Decides the Result

Most disappointing retrofits come down to sequence, not materials. These are the mistakes we plan around from the start.

H3: Systems Before Fabric

Fitting a heat pump before insulating means sizing it to a leaky house. It costs more to buy and more to run. Fabric comes first, always.

Cherry Picking Measures

A single upgrade in isolation rarely moves the dial. Heat lost through an uninsulated roof undercuts a new heat pump. The measures work as a system.

Ignoring Airtightness

Insulation without airtightness leaves draughts and cold spots. Sealing the building is what makes the difference you actually feel.

No Ventilation Plan

A sealed, insulated house needs controlled ventilation to stay healthy and dry. Skipping it risks condensation and poor air quality.

Is Your Dublin Home Suited to a Deep Retrofit

Deep retrofit suits older homes that are hard to heat and costly to run. If any of the following sound familiar, your home is likely a strong candidate.

  • Built before 2011. The eligibility threshold for the One Stop Shop route
  • BER of B3 or lower. Most pre-2000 Dublin homes sit here
  • Cold rooms and draughts. A sign of poor fabric and airtightness
  • High heating bills. Rising oil, gas or electricity costs with little comfort in return
  • Planning a renovation anyway. The most cost effective time to retrofit is alongside other works

Not Sure Where Your Home Stands

We confirm suitability and grant eligibility at the feasibility consultation, before any money is committed to design. If a phased approach suits you better than a full retrofit, we will say so.

Request A Feasibility Consultation
Common Questions

Frequently Asked Questions

A full deep retrofit typically costs €50,000 to €75,000 before grants. After SEAI grants, which usually cover 40 to 50 per cent, most homeowners pay a net figure of €30,000 to €48,000. We confirm your figure after the assessment.
A whole house retrofit commonly attracts €25,000 to €30,000 in combined grants, depending on your home and the measures installed. The exact total depends on dwelling type and scope, which we confirm at assessment.
Not usually. Most homeowners stay in the house for all but the most disruptive phases, such as floor insulation or internal dry lining. External insulation and heat pump installation are far less intrusive.
Most projects run three to six months from assessment to completion, with roughly two to six weeks of construction on site. Larger homes or retrofits combined with renovation work take longer.
Yes. We prepare and submit the applications and manage the process through to the post works BER. Grant approval must be in place before any work begins.

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We review your enquiry before confirming a consultation — ensuring only suitable projects proceed.

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  • Min. project €100k · No surprises

What's Included

  • Feasibility consultation included
  • Measured survey & assessment
  • Technical design package
  • Full project management
  • Engineer certification on completion

Related Services

Home Renovation

House Extension

Attic Conversion

Deep Retrofit

Feasibility Consultation

Not sure where to start?

A feasibility consultation (€200 call · €500 home visit) confirms your planning position before you spend anything on drawings.

Book Feasibility Call
Explore more

Our Services

BuildTech is a specialist design and build contractor. We take on a focused range of projects — and we do not progress any project without a clear, agreed budget.

Single-Storey Rear Extension

The most common home project in Dublin. Open-plan kitchen and living, utility room, or additional family space — from feasibility through to a certified, compliant build.

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Home Renovation

Whole-home renovations and structural alterations for Dublin homeowners. Internal reconfigurations, layout redesign, and full refurbishment — all budget-led from day one.

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Feasibility Consultation

€200 call or €500 home visit. We establish what is realistically achievable within your budget before any design work begins — saving you time, money, and stress.

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Planning Permission

Full application management — pre-planning strategy, drawings, submission, and decision monitoring. Many extensions are planning exempt; we confirm this first.

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Already Have Plans?

Cost Planning & Construction Review from €2,500 + VAT. We provide a full cost breakdown of your existing drawings — gap identification, budget alignment, and value engineering.

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Cost & Technical Design

Measured survey, technical layout, and a detailed cost plan — all aligned to your budget before construction begins. No over-specified designs that cannot be built within your means.

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Our work

Recent Projects

Each project below started with a feasibility consultation and a clear budget. Here is what we delivered.

All Projects

Extension + Renovation

Full Ground Floor Renovation with Rear Extension

Location : Dublin

Scope : Ground floor knock-through, rear extension, open-plan kitchen and living

Status : Planning exempt

✓ Delivered on time and on budget

Extension + Renovation

Sandymount Seafront
Renovation

Location : Sandymount, Dublin 4

Scope : Full home renovation of period seafront property

Status : Planning exempt

✓ Full project management, completed on programme

Extension + Renovation

Rear Extension Plus Partial Renovation, Dublin 14

Location : Dublin 14

Scope : Single-storey rear extension and partial ground-floor renovation

Status : Planning exempt

✓ On budget, handover on schedule

Extension + Renovation

20 sqm Single-Storey Rear Extension, Mount Merrion

Location : Mount Merrion, South Dublin

Scope : 20 sqm flat-roof rear extension, open-plan kitchen and dining

Status : Planning exempt

✓ Completed on time and on budget

Extension + Renovation

Split-Level Open Plan Kitchen & Lounge Renovation

Location : Dublin

Scope : Structural reconfiguration, split-level open-plan kitchen and lounge

Status : Planning exempt

✓ Full project management included

Know What Your Retrofit Will Cost Before You Commit

We confirm your total cost, the grants you qualify for and your net figure before any work begins.

Request a Consultation →
0818 333 443

No obligation. No pressure. Just honest advice.