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Residential Custom Windows
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Custom windows can include raking or curved windows, greenhouse, box and bay formats and glass block windows. Windows made in shapes outside the square or rectangular are manufactured from Residential or upgrade frames (Metro Series, APL Architectural Series etc) and technical information on those suites should be consulted.

Key Features
  • Curving of windows in-plane is possible in several suites but confirmation of the desired frame should be sought before specifications are prepared
  • Greenhouse, box and bay windows all project from the wall of a house
  • Greenhouse windows normally have a sloped glass top while a box window is capped by the eaves
  • All three formats can be ventilated with awning, casement or sliding windows, while full-height bays can incorporate doors
  • Glass block windows are available using an 80mm-thick block
  • A range of glass block patterns is available
  • Compatible with adjoining residential windows and doors through the use of a coupling bar
  • The glass block system has 90° or 135° corner posts available.
Scope of Use
  • A wide range of custom windows can be designed and manufactured, with most design requests capable of a solution
  • Need to be used in defined maximum sizes according to the wind exposure
Limitations on Use
  • Curved windows in plane are possible in several suites but confirmation of desired frame should be sought as well as information on radius limitations
  • Greenhouse windows require single glazing on the main face or acceptance of a double-glaze line at the glass join
  • Care needed if greenhouse or box windows project near walkways or decks.
Statement of Building Code Compliance
  • Designed, tested and manufactured to meet NZS 4211: Performance of Windows, and NZS 4233: Glazing in Buildings, Parts 1-4
  • Designed and tested to conform to NZ Building Code, including Clause E2
In-Service History
  • Custom windows have been widely used in residential projects throughout New Zealand for more than 40 years
  • Widely used by homeowners, builders, group home builders and specifiers
Other Performance Attributes
  • Window and door warranty provided under normal conditions of use against failure of materials and workmanship for a period of five years
  • Surface finish is covered by a separate performance warranty dependent on the actual finish selected
  • A hardware/componentry warranty is offered against defects in manufacturing, functionality and surface finish for a period of five years, provided care and maintenance guidelines have been followed
E2 External Moisture compliant
External Moisture
Data Sheet
Altherm on Masterspec
Full Specification
Specifier Guide
Declare Label


WGANZ Guide to E2/AS1
Altherm Care, Maintenance & Warranty Brochure (with AGP)


Altherm Design Brochure


AGP Cleaning & Maintenance
AGP Condensation Guide
AGP Visual Quality of Glass
APL and Sustainability


Manufacturer Contact List
CAD/PDF Details
Altherm Residential Glass Block Coupling 80mm Block System


Altherm Residential Greenhouse Window


Altherm Residential Greenhouse Window


Altherm Residential Box Window with 90º Corner


Altherm Residential Bay Window with 135º Corner


Stylish contemporary lines, effective thermal technology and unwavering attention to detail have made Altherm a favourite with architects, designers and homeowners across New Zealand.

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