Castleknock Semi Detached – Deep Retrofit

Key Details

Project Name: Castleknock Semi Detached - Deep Retrofit
Client Name: Michael
Delivered: September 2023
Project Scope: Retrofit of a Semi Detached House
We are very pleased with the results of the upgrade and are glad we opted for the MVHR System.
We were also very happy with the calibre of all those who were sent to our house by Bayview to work on the project Homeowner

About the Project

Works as carried out by Bayview Sustainable Homes were:

  • Attic: Topped up to 300mm and ventilated sufficiently
  • Cavity Wall Insulation: Lower front wall pumped with insulating bead
  • External Insulation: 100mm Warm board fitted to external walls
  • Heating System: Gas boiler upgraded to 4 pipe system boiler and controls
  • Windows: One window changed at gable of property
  • Mechanical Ventilation: Vent Axia whole house system
  • Solar PV: 4.8kw Solar PV system installed
  • Lighting Replaced: all bulbs with LED hi efficiency bulbs

Starting Point

  • Rating: C3
  • Primary Energy kwhr/m2/yr: 213.9
  • CO2 Kg/CO2/m2/yr: 41.96
  • Heat Loss Indicator w/m2: 2.16

Finish Point

  • Rating: B1
  • Primary Energy kwhr/m2/yr: 89.3
  • CO2 Kg/CO2/m2/yr: 17.41
  • Heat Loss Indicator w/m2: 1.6


Homeowner had front and rear windows upgraded in recent past.

Sustainable Homes by Bayview managed ALL parts of the homeowner journey including Energy assessment, site survey, client consultation, ALL trades to site, project management, provision of all certificates and sign off, as well as all SEAI grants and energy credits.

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