Design, Cost & Planning

Deep Retrofit Dublin — Full Energy Upgrade, Budget Confirmed First

A deep retrofit upgrades your home's insulation, heating system, and ventilation to dramatically reduce energy costs and improve comfort. BuildTech manages the full process — feasibility, SEAI grant application, design, and installation — as SEAI registered contractors.

We do not progress any project without a clear, agreed budget
If your expectations do not align with your budget, we will tell you immediately
SEAI registered — we manage the grant application process 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.

Our team will respond within 1 business day.

NO OBLIGATIONCIRI REGISTERED
CIRI Registered
Construction Industry Register Ireland
CIF Member
Construction Industry Federation
5★ Google Rated
Verified by Dublin homeowners
100+ Projects Delivered
Across Greater Dublin Region
What Is a Deep Retrofit?

A Whole-Home Energy Upgrade — Planned Around Your Budget

A deep retrofit is a coordinated programme of energy upgrades that brings a home to a significantly higher BER rating — typically B2 or better. It involves external or internal wall insulation, attic insulation, floor insulation, high-efficiency heating (typically a heat pump), and mechanical ventilation with heat recovery.

Unlike individual upgrades done piecemeal, a deep retrofit is planned as a coordinated programme — ensuring each measure complements the others and the home is upgraded to the highest possible standard within your budget.

Full energy assessment — existing BER and retrofit pathway established at outset
SEAI grant application managed on your behalf — maximising available support
Full cost plan provided before any work is committed — net of grants where applicable
Request a Consultation →
Deep retrofit Dublin — BuildTech insulation and heat pump installation
SEAI registered contractor Grant application managed for you
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."

"BuildTech expertly handled my Dublin house renovation, offering professional, reliable service with clear communication, integrity, and cost-effective solutions, saving me time and stress. From the very first consultation I knew I was dealing with a team that genuinely cared about getting the job done right."

KW
Kirsten Wendenburg
Google

"Excellent communication and budget-friendly suggestions throughout."

"BuildTech fully renovated our house, offering excellent communication, budget-friendly suggestions, and efficient problem-solving. We are thrilled with the result, which exceeded our expectations. The team was professional at every stage and the final finish was outstanding."

OA
Olga Antipenko
Google

"Excellent communication and support throughout. Highly recommend."

"BuildTech helped with my rear extension, providing excellent communication and support throughout. The project was delivered on time and exactly as quoted. The team was respectful of our home and kept disruption to a minimum. Highly recommend to any Dublin homeowner."

JH
John Hagan
Google

"Handled my renovation with professionalism and care. Very pleased."

"BuildTech handled my renovation, including plumbing and plastering, with professionalism and care. Very pleased with the results. The team was courteous, tidy, and kept me informed at every stage."

JH
Jason Hollifield
Google

"Expertly guided my house renovation, delivering exactly what I wanted."

"BuildTech expertly guided my house renovation, delivering exactly what I wanted. The process was smooth from start to finish and the quality of the work speaks for itself."

SM
Salena McCarthy
Google

"Made building my home easy and successful."

"BuildTech made building my home easy and successful. The team was knowledgeable, responsive, and delivered on every promise. Thanks, BuildTech!"

JB
Judy Braodnax
Google

"My kitchen looks amazing after the renovation — great work from BuildTech!"

"My kitchen looks amazing after the renovation — great work from BuildTech! The team transformed the space completely and the quality of the finish is exceptional."

VV
Victoria Vetter
Google

"Kitchen and bathroom renovation — beautiful, eye-catching result."

"Thanks to BuildTech for my kitchen and bathroom renovation, giving my home a beautiful, eye-catching look. The team were professional throughout and the result exceeded what I had hoped for."

FP
Fabio Pulvirenti
Google

"The team was very kind to answer all my questions throughout."

"So far so good. The team was very kind to answer all my questions throughout the process and I felt informed and comfortable at every stage."

AH
Anne-Marie Hickey
Google

"Expertly managed my cottage renovation remotely — great communication and quality results."

"BuildTech expertly managed my cottage renovation remotely — great communication, quality results, and a helpful team. Highly recommended! The remote management process was seamless and the results were excellent."

KC
Kristen and Colm
Google

"Transformed our home with excellent management and clear communication."

"BuildTech transformed our home, providing excellent management and clear, responsive communication throughout the entire project. We are delighted with the result and would not hesitate to recommend them."

J
Justin
OT OnlineTradesmen

"Professional, courteous, punctual — stayed late, finished early. Excellent work."

"Ronan's team revamped a room, gutting, rewiring, insulating, plastering. Professional, courteous, punctual, stayed late, finished early, excellent work, very pleased. Would not hesitate to use BuildTech again."

D
Dylan
h Houzz

"Professional, courteous, punctual — finished early. Excellent work."

"Ronan's team revamped a room, gutting, rewiring, insulating, plastering. Professional, courteous, punctual, stayed late, finished early, excellent work, very pleased. A pleasure to deal with from start to finish."

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Matt
h Houzz

"The client portal gives full project transparency — drawings, costs, updates and team comms."

"Buildtech's client portal gives full project access, drawings, costs, updates & team comms, ensuring full transparency. This level of visibility into the project is something I had never experienced with a contractor before — outstanding."

K
Kirsten
h Houzz

"Superbly renovated our home — great team, clear communication, outstanding results."

"BuildTech renovated our home superbly — great team, clear communication, smart advice, and outstanding results! Every aspect of the project was handled professionally and the quality of the finish is exceptional."

Deep retrofit installation — BuildTech Dublin energy upgrade
Documentation prepared in-house No third-party delays
Full Installation Management

All Trades Coordinated In-House — Insulation, Heat Pump, and Ventilation

BuildTech manages all trades required for a deep retrofit in-house — insulation contractors, heat pump installers, and ventilation system installers are all coordinated through a single project manager. You deal with one point of contact throughout.

Every deep retrofit is delivered to a clear, agreed cost, with grant funding deducted from the total. The net cost to you is confirmed before any work begins.

All trades coordinated in-house — insulation, heat pump, ventilation, and controls
Cost confirmed before work begins — the cost to you confirmed before work begins
BER certificate issued on completion confirming the upgraded energy rating
Request a Consultation →

Considering a deep retrofit? We confirm grant eligibility and give you a full net cost before any work is committed.

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
Why BuildTech

Why Choose BuildTech for Your Deep Retrofit?

BuildTech is SEAI registered for deep retrofit works. We manage the full programme — energy assessment, grant application, design, and installation — through a single project manager. You do not need to coordinate multiple contractors or navigate the SEAI grant process yourself.

We do not progress projects without a clear, agreed budget. Grant eligibility and net cost are confirmed at the outset — before any work is committed.

We do not progress projects without a clear, agreed budget — always
SEAI registered — we manage the full grant application process on your behalf
All trades coordinated in-house — one contract, one project manager, one point of contact
Cost confirmed before work begins — the net cost to you confirmed before work begins
BER certificate issued on completion confirming the upgraded energy rating
How It Works

Our Planning Application Process

BuildTech manages the full planning permission process from initial feasibility through to decision. Every stage is handled internally — there are no third-party handoffs that cause delays or miscommunication.

1

Feasibility & Exemption Check

We confirm whether your project requires planning permission or qualifies as Exempted Development. Many single-storey rear extensions in Dublin do not need planning — we establish this clearly at the outset, saving you time and fees.

2

Pre-Planning Strategy & Local Authority Engagement

Where planning is required, we develop a pre-planning strategy aligned with the relevant local authority's development policies. Where appropriate, we engage with the planning authority informally before submission to identify potential issues early and reduce the risk of refusal.

3

Planning Drawings & Documentation

Our in-house architectural design team prepares all required drawings — site location map, site plan, floor plans, elevations, and sections — along with any supporting reports and compliance documentation. Accurate, complete documentation reduces the risk of requests for further information from the council.

4

Submission & Application Management

We prepare and submit the full application to the relevant local authority — Dublin City Council, Dún Laoghaire-Rathdown, Fingal, or South Dublin County Council. We manage all correspondence and respond to any requests for further information within the statutory timeframes.

5

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

What Can Cause Delays or Refusals in Planning Applications?

Delays and refusals in planning applications are almost always avoidable with proper preparation. The most common causes in Dublin are:

Incomplete documentation

Missing drawings, incorrect scale, or absent site information trigger requests for further information — adding weeks to the process.

Policy conflicts

Designs that don't align with the local development plan — on height, scale, overlooking, or amenity — attract objections or conditions.

No pre-planning engagement

Submitting without checking with the planning authority first misses an opportunity to identify issues before they become formal refusal reasons.

Wrong application type

Applying for full permission when the works are Exempted Development — or vice versa — wastes time and money. We confirm the correct route at feasibility stage.

Exempted Development

What Can You Build Without Planning Permission in Dublin?

Many home extensions and improvements in Dublin qualify as Exempted Development under the Planning and Development Regulations — meaning no planning application is required. However, exemptions are subject to specific conditions and can be lost if previous unauthorised works exist on the property.

Common Exempted Development for residential properties includes:

Single-storey rear extensions up to 40m² (combined with any previous extensions) — provided the rear garden is not reduced below 25m²
Attic conversions using Velux-type rooflights that do not increase the ridge height or alter the front roofline
Domestic garages and sheds — subject to floor area and height limits
Solar PV panels and heat pump installations — subject to specific criteria

Not sure if your project needs planning?

BuildTech confirms planning status as part of every feasibility consultation — before any design fees are committed. If your project is Exempted Development, we will tell you clearly and save you the cost of an application.

Request a Feasibility Consultation →
Common Questions

Frequently Asked Questions

SEAI offers a range of grants for energy upgrades, including grants for insulation, heat pumps, ventilation, and solar PV. The One Stop Shop scheme allows SEAI registered contractors like BuildTech to manage the full application on your behalf, accessing grants of up to €25,000 or more for a comprehensive deep retrofit. Eligibility depends on the home's current BER rating and the works planned.
A full deep retrofit typically includes: external or internal wall insulation, attic insulation, floor insulation, a high-efficiency heat pump (replacing the existing heating system), mechanical ventilation with heat recovery (MVHR), and new heating controls and radiators or underfloor heating. The exact scope depends on the home's existing condition and the target BER rating.
The gross cost of a full deep retrofit typically ranges from €40,000 to €80,000 or more, depending on the size of the home and the scope of works. SEAI grants can significantly reduce this. BuildTech confirms the net cost — gross cost minus applicable grants — before any work is committed.
A full deep retrofit typically takes 4 to 8 weeks from construction start to completion, depending on the scope. BuildTech coordinates all trades to minimise disruption and manages the programme to avoid extended periods without heating or hot water.
It depends on the scope and the specific measures involved. For most deep retrofits, the work can be carried out while the homeowner remains in the property — though there may be periods of disruption, particularly when the existing heating system is being replaced. BuildTech advises on this at the planning stage.
What We Do

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 ★ Core

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 Start Here

€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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Take the First Step

Ready to Upgrade Your Home's Energy Performance?

BuildTech manages the full deep retrofit process — from SEAI grant application through to installation and BER certification. Budget confirmed before any work begins.

No obligation. No pressure. Just honest advice.

Call Us Get a Consultation