Aluminium Windows at Build it: A Project Buyer’s Guide
Compare sizes, opening types and supply scope for your South African project before choosing a branch, a local specialist or a DERCHI factory proposal.
An independent guide from DERCHI. For current Build it products, prices and stock, contact your Build it branch.
Comparing aluminium windows at Build it?
Compare availability and site support alongside the specification. Local suppliers may offer custom windows too.
Check the local retail option
For a retail unit or urgent replacement, confirm the item code, size basis, handing and glazing with your branch.
Find your Build it branch- Useful when
- A locally available unit fits the opening and programme.
- Ask the branch
- Stock, order options, delivery and available project services.
Coordinate local supply & fitting
A window specialist or fabricator may combine standard or custom units with site measurement and installation.
- Useful when
- On-site coordination is central to the purchase.
- Ask the supplier
- Who measures, fits, seals, makes good and supports the installation.
Compare a project specification
Bring a multi-opening window schedule to DERCHI to discuss systems, sizes, glazing, finishes and the proposed supply scope.
Prepare a comparable specification- Useful when
- You can coordinate drawings, delivery and the site installation.
- Discuss first
- Quantity, destination, required date and project feasibility.
Read the size before you order
A retail size label may describe an opening or a product dimension. Record the measured site opening and the approved finished-frame size separately.
Write width × height in millimetres, identify the viewing side and mark the handing. Agree the fitting allowance for the selected system and installation detail.
Choose an opening for the siteNeed a made-to-order frame? Explore custom aluminium windows once the site dimensions and configuration are clear.
finished frame
- Window / quantity
- W01 / your quantity
- Site opening
- Width × height, mm
- Finished frame
- To approved drawing
- Opening / handing
- Type + viewing side
- Configuration
- Glass + finish
Choose an opening your site can accommodate
Start with external clearance, ventilation and access to the handle. Use these DERCHI systems as a shortlist for your project specification. Compare the wider aluminium window range for other layouts.
S63 awning window
A top-hung sash for an operable section where outward projection can be accommodated.
Check the sash projection, handle height and any external obstruction.
View S63 system
S6 casement window
An outward-opening option to discuss where the site allows a swinging sash.
Keep the swing clear of paths and adjacent elements; coordinate cleaning access.
View S6 system
E5T sliding window
A horizontal sliding option when outward swing conflicts with the surrounding space.
Check the openable area, track access and the selected panel arrangement.
View E5T system
Specify the whole window,
not just the size
Heat & noise
Set thermal and acoustic goals separately. Compare the glass make-up and the applicable whole-window results for each proposal.
Privacy & daylight
Identify overlooking and useful views. Discuss glazing or shading choices alongside the daylight you want to retain.
Finish & exposure
Record colour and finish consistently across the schedule. Include coastal exposure or other site conditions in the brief.
Hardware & access
List locks, stays, handles and any screens or protective accessories. Check reach, operation and whether each item is included.
Compare the same window
and supply scope
Align the specification and cost boundaries before comparing unit prices. Put these six groups on each supplier’s quotation.
| Match this | Include in the comparison |
|---|---|
| Window reference, quantity, size basis and approved frame dimensions. | |
| Opening, handing, glass, finish, hardware and any screens or protective accessories. | |
| Quotation currency, tax treatment and the stated validity period. | |
| Packing scope, transport charges, delivery point and responsibility for destination costs. | |
| Measurement, installation, old-window removal, sealing, plastering, painting and access equipment. | |
| Production and transport stages, installation responsibility, warranty terms and replacement-part arrangements. |
Match the documents
to the selected window
Match technical documents to the system and configuration being quoted. Give your project designer the applicable requirements before the order is agreed.
System & sample
Check the system name, opening type, test-sample dimensions and glazing against the proposed window.
Method & result
Identify the issuing body, test method, measured values and units. Keep thermal, acoustic and weather-performance requirements distinct.
Project approval
Track the drawing revision, site-dimension checks and the person approving manufacture. Apply your project’s document requirements.
See the manufacturing
behind the specification
Explore DERCHI’s manufacturing setting. Agree inspection stages, packing requirements and any third-party inspection arrangements before dispatch.
Agree the handover
before you order
Assign each responsibility in the order. Keep the final window schedule, drawings and commercial terms together. See DERCHI windows and doors for builders for wider project planning.
Before manufacture
Assign site measurement and approval. Confirm window references, dimensions, handing, glazing and the shop-drawing revision. Recheck cost and timing after specification changes.
At dispatch & on site
Agree inspection, unit labels, packing, the delivery point and unloading. Assign receipt checks, installation, sealing, adjustment and making good. Separate production from transport and site work.
After installation
DERCHI’s default warranty is 10 years. Check component cover, start date, exclusions, labour and freight in the written terms. Keep window references, system details and photos for service or replacement parts.
Questions before
you enquire
A few final checks to keep the next conversation useful.
This guide is published by DERCHI, an independent window manufacturer. For Build it retail products, current prices, promotions and availability, contact the relevant Build it branch.
Use the code as a reference for comparison. Match the size basis, opening, handing, glass, finish and hardware with the DERCHI configuration before ordering; a retail code does not identify an equivalent DERCHI system.
Yes. Approximate dimensions and quantities can start the discussion. A final manufacturing specification needs the agreed dimension basis, site information, configuration and approved drawing revision.
You can assess each opening separately. Coordinate the appearance, finish, dimensions and installation interfaces across the project; products from different systems are not automatically interchangeable.
Each order should identify the supplier, installer and aftercare responsibilities. For a DERCHI enquiry, bring the window reference and configuration; agree installation arrangements, written warranty terms and replacement-part logistics for your project.
Bring your window
schedule to DERCHI
Share your openings and project priorities. Approximate sizes can start the discussion; agree final manufacturing dimensions before production.
- Project location & required date
- Quantity, dimensions & handing
- Glazing, finish & technical requirements
- Site measurement & installation arrangements
Use a project enquiry checklist
DERCHI project enquiry — Build it buying guide Project location / delivery destination: Your role / company: Required date: Window references, quantities and opening sizes (W × H, mm): Opening type / handing / viewing side: Glazing, finish, hardware and technical requirements: Site measurement, installation and delivery arrangements: Drawing or window-schedule revision, if available:
Prefer email? Email your project details to DERCHI.
