Aluminium vs Timber Window Frames: Cost, Compliance and Maintenance Comparison
Guide Type: Comparison guide
A practical South African comparison of aluminium and timber window frames, covering allowance scope, glazing coordination, maintenance and approval considerations.
Quick answer
Aluminium is often selected for a lower-maintenance contemporary frame system, while timber can provide warmth and repairability where a maintenance programme is accepted. Compare the complete opening package, not only a frame price.
How to compare the options
| Option | Best suited to | Include in the allowance |
|---|---|---|
| Aluminium | Modern profiles, regular geometry and lower ongoing coating maintenance. | Profile series, glazing, thermal and acoustic requirements, hardware and site protection. |
| Timber | A natural appearance, repairable material and strong fit for selected architectural styles. | Species, finish system, moisture control, joinery quality and periodic recoating. |
Cost and planning checklist
- Obtain a window-and-door schedule before seeking prices.
- Coordinate the glass specification, safety glazing, flashings, sills and waterproofing with the installer.
- Confirm the final design and glazing requirements with the project professional and local approval process.
Use the estimator
Build an early, region-aware allowance in the Price Your Build free estimator. It is a feasibility tool, not a supplier quotation, final design or professional certification.
Related Building Glossary guides
Frequently asked questions
Which frame lasts longer?
Service life depends heavily on correct specification, fabrication, installation, drainage and maintenance. A good system installed correctly is more important than a headline material comparison.
Does the estimator include glazing?
Use the relevant window-frame selection and opening allowance, then verify the detailed glass and hardware scope with suppliers.
Important
Confirm the final product, scope, installation method, drawings, approvals and professional requirements for the specific site before committing to work.