Heat-loss control
Roof, walls, floors, windows and doors selected from the actual construction and exposure.
Measured whole-house upgrade
Deep House Retrofit Dublin
Deep retrofit works when the house is treated as one environmental system. Top Builders coordinates assessment, design and construction around comfort, heat loss, air movement, moisture, services and a clearly defined performance brief.
Discuss your project
Baseline to target
Measure the starting house. Model the finished house. Verify the work between.
01Existing condition
BER, heat loss, ventilation, airtightness risks, moisture and services.
02Agreed brief
Comfort priorities, performance target, retained fabric, budget and programme.
03Coordinated works
Fabric, junctions, windows, air control, ventilation, heating and renewables.
04Verification
Installation records, testing, commissioning and final assessment as specified.
Retrofit quality sits at the interfaces: eaves, windows, floors, party walls, services and every break in the air barrier.
Whole-house package
Every measure changes the conditions for another.
Thermal continuity
Details designed around openings, eaves, thresholds, intermediate floors and structural penetrations.
Airtightness
A continuous layer, buildable sequencing and proportionate testing rather than late sealing.
Ventilation
A designed and commissioned route for indoor air quality after leakage is reduced.
Heating system
Heat source, emitters, controls and hot water sized for the upgraded home.
Commissioning
Records and checks that show systems operate as intended at handover.
RETROFIT / SYSTEM 05
Insulation without junctions, airtightness without ventilation, or a heat pump without heat-loss design is not a whole-house strategy.
Investment variables
What shapes a deep retrofit quote.
- 01Existing construction and measured baseline
- 02Target performance and verification requirements
- 03Access to roof, wall, floor and window junctions
- 04Ventilation, heating, hot water and electrical upgrades
- 05Extent of simultaneous renovation and finish reinstatement
Detailed service guide
House Deep Retrofit: detailed scope and decisions.
Substantively updated
A deep house retrofit is a coordinated upgrade to the way a home retains heat, controls air movement, manages moisture and provides heating and ventilation. It addresses the building as a complete system instead of adding unrelated energy measures one at a time.
Top Builders coordinates substantial deep-retrofit construction for Dublin homes, bringing fabric upgrades, airtightness, windows, heating, ventilation and associated renovation work into one property-specific scope.
Start with the problem
Is your home cold, draughty or difficult to heat?
A house can use a great deal of heat and still feel uncomfortable when the fabric and services are not working together. Turning up the thermostat or adding another heater does not by itself resolve uncontrolled heat loss, cold surfaces or poor air movement.
- Rooms that remain cold while the heating is on
- Heat that disappears soon after the heating switches off
- Cold external walls, floors or ceilings
- Draughts around windows and doors
- Uneven temperatures between rooms
- Condensation, excess humidity or poor ventilation
- An inefficient or outdated heating system
- An older BER that no longer reflects the performance you want
Whole-house definition
What is a deep retrofit?
A deep retrofit combines fabric and service improvements around an agreed objective for the individual home.
The exact package depends on the property's construction, condition, current energy performance and the household's priorities. Not every measure belongs in every house, and one upgrade can change the design requirements for another.
- External or internal wall insulation
- Attic and roof insulation
- Floor insulation
- High-performance windows and external doors
- Airtightness improvements and draught reduction
- Thermal-bridge reduction at vulnerable junctions
- Mechanical ventilation or MVHR where appropriate
- Heat pumps or other heating-system upgrades where suitable
- Solar PV where it forms part of the selected energy strategy
- Associated building, service and finishing work
- Measures intended to improve overall energy performance and BER
Reduce heat loss carefully
Insulation, windows, airtightness and thermal junctions
External and internal wall insulation
External wall insulation can improve suitable walls while changing the outside build-up and its junctions with roofs, windows, doors and ground level. Internal wall insulation may be considered where the exterior should not or cannot be altered, but it needs careful design around moisture, thermal bridges, room details and ventilation.
Attic, roof and floor insulation
Roof, attic and floor upgrades can reduce cold surfaces and heat loss where the existing construction allows. Access, ventilation, moisture behaviour and continuity with wall insulation all affect the appropriate build-up.
Windows and external doors
Replacement windows and doors can reduce draughts and cold spots when their specification and installation are coordinated with the wall, insulation and airtightness layers. The surrounding reveals and junctions matter as much as the individual unit.
Airtightness and thermal bridges
Airtightness work targets uncontrolled leakage rather than eliminating planned fresh air. Continuity at floors, roofs, openings, service penetrations and structural junctions helps the fabric perform as intended; ventilation then provides controlled air change.
Services follow the fabric
Ventilation, heat pumps, efficient heating and solar PV
As insulation and airtightness improve, ventilation becomes a central design decision. A suitable system can help manage moisture, humidity and indoor air quality while limiting uncontrolled heat loss. Mechanical ventilation or MVHR may form part of the package depending on the house and retrofit design.
A heating system should be selected alongside the upgraded fabric and the home's expected heat requirement. A heat pump or another efficient heating solution may be considered where the property and overall design support it. Solar PV can also be assessed as one element of the wider energy plan rather than a substitute for resolving fabric performance.
Respect the construction
Deep retrofit for period and older Dublin homes
Older Dublin houses can have solid walls, traditional materials, retained architectural details and layers of previous alteration. A retrofit should respond to how that particular fabric handles moisture and air, rather than applying one standard build-up to every property.
Where the external appearance or important interior features need to be retained, insulation type, service routes, window details and ventilation require especially careful coordination. Better performance should be pursued without treating the character and construction of the house as obstacles to be erased.
The lived result
The main benefit is a more comfortable, better-performing home
Energy performance is not only a number or a utility bill. A coherent retrofit aims to make rooms easier to keep warm, reduce cold surfaces and uncontrolled draughts, improve temperature consistency and manage humidity and ventilation more deliberately.
The actual change in energy use or BER depends on the starting property, the measures selected, their design and the completed work. Those outcomes should not be promised from a single product in isolation.
Assessment to completion
How a whole-house deep retrofit is developed
1. Understand the existing home
Record the construction, current condition, previous upgrades, comfort problems and available energy-performance information.
2. Identify compatible opportunities
Consider walls, roof, floors, windows, airtightness, thermal junctions, ventilation, heating and renewable systems together.
3. Define one retrofit plan
Bring the selected measures, professional inputs, construction work, service changes and finishing requirements into a coherent scope and sequence.
4. Coordinate construction and specialist work
Manage the interfaces between fabric, windows, airtightness, ventilation, heating, electrics and the retained parts of the home.
5. Complete the agreed upgrades
Finish the building work around the defined performance and comfort objectives, with project-specific checks and documentation established by the appointed team.
Investment and support
Deep-retrofit cost, BER improvement and SEAI grants
Deep-retrofit cost varies with the home's size, construction and condition, its existing performance and the combination of work required. A period house receiving wall, roof and floor insulation, new windows, airtightness, ventilation and heating changes has a different scope from a more modern house needing fewer measures. A property assessment and defined package are more useful than a generic square-metre figure.
A deep retrofit can target improvement in overall energy performance and BER, but the result depends on the starting point, design and completed measures. Grant eligibility, approved processes, funding levels and technical requirements can change; check current official SEAI guidance and the required professional route before making the project dependent on support.
Questions before scope
Deep retrofit questions before products are selected.
01What makes a retrofit ‘deep’?
It is a coordinated whole-house upgrade with a measured baseline and target, rather than unrelated single measures. Fabric, airtightness, ventilation, thermal bridges, windows and heating are assessed together.
02Should insulation be installed before a heat pump?
The heat-loss and emitter design should reflect the completed fabric strategy. Sequencing measures without a whole-house assessment can oversize equipment or leave comfort problems unresolved.
03Why does ventilation change during retrofit?
As uncontrolled air leakage is reduced, planned ventilation becomes more important for indoor air quality and moisture management. The system must suit the final airtightness and household use.
04Can a period house receive a deep retrofit?
Potentially, but traditional fabric requires a building-specific approach to moisture, retained features and statutory status. The target and measures must be compatible with the house.
05Does Top Builders guarantee a particular BER?
The project can be designed around an agreed target, but the assessment method, scope, modelling assumptions and verification route must be defined before any outcome is contracted.
06Is a deep retrofit worth it?
It can materially improve comfort and energy performance in a suitable home. Whether the investment is right depends on the property's current condition, the compatible measures, planned renovation work, budget priorities and how long you expect to use the home.
07Can an old or period Dublin house be deeply retrofitted?
Often, yes, but the solution must respond to the actual construction. Solid walls, traditional materials, moisture behaviour, architectural details and restrictions on external change can all affect the insulation, window, airtightness and ventilation strategy.
08Can a deep retrofit improve my BER?
Improving overall energy performance is a central retrofit objective, and the selected package may improve the BER. The actual result depends on the home's starting performance and the measures designed and completed for that property.
09Can insulation, windows and heating be upgraded together?
Yes. Coordinating fabric, windows, airtightness, ventilation and heating is the purpose of a whole-house approach. The exact combination depends on assessment and suitability.
10Does making a house more airtight mean it will not get fresh air?
No. Airtightness addresses uncontrolled leakage; planned ventilation provides deliberate air change. The ventilation strategy becomes more important as the fabric is improved.
11Can a heat pump, MVHR or solar PV be included?
These systems can be considered where they suit the property and the wider retrofit design. They should be assessed alongside the building fabric, airtightness, ventilation needs, heating demand and service requirements.
12Can SEAI grants support a deep retrofit?
Support may be available depending on the property, proposed measures and current scheme requirements. Eligibility, funding and process rules should be checked against the latest official SEAI guidance before the project scope relies on a grant.
Start with the property
Set the performance target before selecting the measures.
The enquiry form carries this service into your brief. Add the address area, project stage and any photographs or drawings you already have.
Start your brief