Altherm Northland

What Altherm Northland does

Altherm Northland Limited is a privately held aluminium joinery manufacturer established in 1980 and headquartered at 18 Hewlett Street, Whangarei, New Zealand. The company designs, fabricates, and supplies aluminium windows and entrance doors for residential and commercial construction projects across the Northland region and Auckland metropolitan area. Its product portfolio spans the Metro Series, Residential Series, APL Architectural Series, and APL Commercial Series, including seismic-rated 40mm and 125mm flush-glaze profiles and shop front systems, plus a dedicated entrance door range (Latitude, Plasma, Axis, Classic, Glass Plasma). Thermal performance is delivered via the ThermalHeart+® platform using polyamide thermal insulators, dual seals, and high-density foam cores, and via the AGP System® double-glazing with Solux-E® and Solux Ultra® low-E glass backed by a 12-year warranty; finishing is through Dulux powdercoating (Duralloy® +PLUS, Duratec, Protexture™) and anodising. The company operates inside the APL Window Solutions distribution network, New Zealand's largest window and door supply chain, and holds WGANZ membership along with Toitū carbonreduce, Declare, and EPD certifications.

The business runs a sales-led, project-based go-to-market: customers engage through the Whangarei showroom or initiate free quotes online for either supply-only or supply-and-installation engagements, with decisions driven by thermal performance, code compliance, and colour/glass specification. The customer base mixes residential homeowners, commercial builders and developers, architects and designers, and named enterprise accounts spanning aged care (Summerset Ellerslie, Summerset St Johns, Ranfurly Retirement Village), education (Kamo High School, Grafton Hall), hospitality and retail (Kennedy Point Waiheke, Tristan Volkswagen Henderson), construction (Trigg Construction, Guyco Construction), and cultural (Hundertwasser Whangarei) projects. Pricing is fully custom and not publicly disclosed, and revenue is not reported; stated headcount of 1–10 is internally inconsistent with the company describing a 'large factory with the latest manufacturing equipment' completing multi-level commercial work, indicating the firmographic employee count understates operational scale.

Name

Altherm Northland

Legal name

Altherm Northland Limited

Website

https://althermnorthland.co.nz

Company type

Private

Founded year

1980

Operating status

Operating

Headcount range

1–10 employees

Short description

Altherm Northland Limited is a Whangarei-based aluminium joinery manufacturer established in 1980, supplying ThermalHeart+® windows and entrance doors, AGP System® double-glazing, and commercial seismic-rated systems to builders, architects, and homeowners across Northland and Auckland.

Ownership category

akta.pro rank

Product category

Aluminium Joinery

NAICS

Metal Window and Door Manufacturing (332321)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Architectural & Building Glazing Systems (Curtain Wall/Storefront/Canopies) (IMADAHAB)

Keywords

• Aluminium joinery
• Windows and doors
• Thermal insulation
• Commercial joinery
• Residential joinery

Headquarters

HQ city

Whangarei

HQ country

New Zealand

HQ region

Oceania

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Infrastructure, Marketing or Sales

Revenue model

1. Aluminium Joinery Sales: Manufacture and sale of aluminium windows and doors for residential and commercial projects. Revenue derived from supply-only and supply-and-installation contracts.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Altherm Northland manufactures and supplies aluminium windows, entrance doors, and related joinery hardware from its Whangarei factory for residential and commercial building projects throughout Northland and Auckland. Offerings span thermally improved joinery (ThermalHeart+®), multiple product series (Metro, Residential, APL Architectural, APL Commercial), entrance door lines (Latitude, Plasma, Axis, Classic, Glass Plasma), the AGP System® insulated glazing with Solux-E® and Solux Ultra® glass, seismic-rated commercial framing, and finishing services including Dulux powdercoating and anodising. Products are sold through supply-only contracts or supply-and-installation contracts based on project quotes.

Product overview

Altherm Northland is a Whangarei-based aluminium joinery manufacturer and supplier offering a comprehensive portfolio of windows, doors, and related products for residential and commercial construction. The core product is aluminium joinery available in multiple series including ThermalHeart+® (thermally improved), Metro Series, APL Architectural Series, Residential Series, and APL Commercial Series. The company also supplies specialty glass through The AGP System® (featuring Solux-E® and Solux Ultra® low-E glass), various entrance door styles (Latitude, Plasma, Axis, Classic, Glass Plasma), and finishing services via Dulux powdercoating and anodising. Products serve projects from high-end residential homes to large-scale multi-level commercial developments, with a network supported by APL Window Solutions and manufacturing backed by PGL Group.

Differentiator

Problem solved

Functional benefit

Products and services

• Windows and Doors

Quantifiable outcome

• AGP System with Solux Ultra provides 23% better overheating control compared to single glazed 3mm clear glass
• +2 more outcomes

Named customers12 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Five partnerships are on record, tiered core and minor.

• APL Window SolutionscoreStrategic or Co-development PartnerAltherm Northland is part of APL Window Solutions, New Zealand's largest window and door supply chain. Products meet APL's sustainability benchmarks and carry APL's certifications including Toitū carbonreduce certification, Declare label, and EPD certifications.
• AGP GlasscoreTechnology or IntegrationAGP (Architectural Glass Products) is a manufacturer of insulated glass units supplying the Altherm/APL network. AGP operates from a world-class facility in Hautapu, near Cambridge, and provides The AGP System® with Solux-E® and Solux Ultra® glass products backed by extended warranties.
• Dulux PowdercoatingscoreTechnology or IntegrationPowdercoat colours supplied by Dulux Powdercoatings including Duralloy® +PLUS, Duratec, and Protexture™ product lines. Dulux provides film and colour integrity warranties for residential and light commercial applications.
• Window and Glass Association of New Zealand (WGANZ)coreOthersIndustry association membership providing credibility, compliance standards, and industry representation for window and glass manufacturers in New Zealand.
• International Living Future InstituteminorOthersThrough APL Window Solutions, products carry the Declare label from the International Living Future Institute, indicating Red List Free compliance.

Scale indicators2 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Nulook: New Zealand window and door manufacturing network with multiple regional fabricators. Directly comparable franchise/manufacturer model serving builders and homeowners nationwide.
• Eurostyle Windows & Doors: NZ manufacturer of aluminium joinery for residential and architectural projects. Competes directly with Altherm in the thermal-efficiency and architectural specification segments.
• Vantage Windows & Doors (Fletcher Building): Fletcher Building's aluminium window and door brand operating nationally across New Zealand. Direct competitor in aluminium joinery manufacturing with broader product range and significantly larger scale.
• First Windows & Doors: New Zealand aluminium window and door manufacturer serving residential and commercial markets. Comparable in product range, custom manufacturing, and thermal-performance positioning.
• Vista Aluminium: NZ aluminium joinery manufacturer offering residential and commercial windows and doors. Direct competitor in the local fabrication and supply market.

Broad incumbents

• Pella Corporation: Major US-based window and door manufacturer with broad product portfolio including aluminium-clad lines. Useful as a comparable for scale, distribution, and energy-efficiency positioning.
• JELD-WEN: Global manufacturer of windows and doors including aluminium and composite products. Provides a benchmark for the scale and competitive dynamics of large fenestration players.
• Andersen Corporation: Large North American window and door manufacturer with aluminium, wood, and composite offerings. A benchmark incumbent for scale, brand strength, and product breadth in fenestration.

Others

• APL Window Solutions: Parent supply network of which Altherm Northland is a member. Comparable as the operating ecosystem governing Altherm's brand, certifications, and product portfolio.

Emerging players

• ThermaDux: NZ-based thermal aluminium window and door manufacturer focused on high-performance energy-efficient joinery. Comparable in thermal-technology positioning and product-line emphasis.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/althermwindows
• LinkedInlinkedin.com/company/altherm-northland-ltd

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Altherm Northland