The selection / Replacement specification
Energy-conscious window replacement
Comfort starts with the complete window and the way it meets the wall. Compare insulated glazing, low-e coatings, thermal breaks where applicable, weatherseals and published whole-window ratings alongside installation details suited to your house.
Book a home visitPriced per opening, in a written proposal after we have measured the house.
The specification
What to consider
- Whole-window U-factor and solar heat gain coefficient describe different parts of the performance specification.
- Air infiltration, glazing construction and frame design should be compared for the specific unit proposed.
- Perimeter insulation, flashing and sill drainage influence the installed result and must be included in the scope.
Materials & methods
The new assembly.
A considered specification.
Review whole-window U-factor, solar heat gain coefficient and air-infiltration data where available. Thermal breaks, flashing, anchorage and perimeter insulation belong in the same discussion.
Read the technical field notes →Measured opening survey
Opening dimensions, reveal depths, photographs and existing profiles establish the starting point for replacement.
Product & glazing selection
Compare manufacturer options, frame materials, glass construction, finishes and hardware against the house and your priorities.
Written replacement proposal
Agree the selected window system, installation scope, trim details and pricing before an order is placed.
The work
From survey to replacement
- 01
Assess
Discuss exposure, room use, comfort concerns and existing openings.
- 02
Compare
Review published ratings for the proposed complete windows.
- 03
Detail
Agree glazing, frame construction and perimeter sealing.
- 04
Install
Fit the selected assemblies to the documented installation scope.
- 05
Explain
Review operation, ventilation and product-specific care.
Questions
Questions owners ask
Does double glazing guarantee a warmer room?
No universal result can be promised. Frame construction, air leakage, installation and the rest of the building matter. Compare documented whole-window ratings for the product proposed.
Will replacement windows eliminate condensation?
Not in every condition. Indoor humidity, ventilation, outdoor temperature and surface temperatures all contribute. Discuss these alongside glazing and frame options.
What is measured for an energy-conscious specification?
Opening sizes, frame depth, existing air leakage points and orientation. Glass, seals and installation details are then specified together rather than glass alone.
Will new windows lower my energy bills?
Results depend on the house, the heating system and how it is used, so we do not promise savings. We give you the published whole-window ratings for the exact product.
Start with the house, not a sales pitch
A measured replacement proposal.
Speak with our historic window specialists.
Tell us your town and the windows you want to replace. We’ll discuss frame materials, glazing, manufacturer options and the installation scope.