Most Nigerians building or renovating a 3 bedroom flat have no idea how many aluminium windows they actually need — or what the total cost should look like before they sit down with a fabricator.
Some end up overpaying, others buy the wrong window type for the wrong room, and a fair number settle for cheap materials that start deteriorating within two rainy seasons. Then come the repairs, the regrets, and the second round of spending.
In this guide, you will get the real 2026 price breakdown, the exact number of windows a standard 3 bedroom flat typically needs, the best window types for each room, the mistakes to avoid, and everything you should confirm before you pay anyone a single kobo.
How Much Do Aluminium Windows for a 3 Bedroom Flat Cost in Nigeria?
The total cost depends on the number of windows your flat requires, the window type you choose for each room, the glass thickness and type, and where in Nigeria the building is located. Labour rates and material transportation costs vary meaningfully across states.
Here is a quick estimate to anchor your planning:
| Flat Type | No. of Windows | Estimated Total Cost |
|---|---|---|
| Small 3-bedroom flat | 8–10 windows | ₦800,000 – ₦1,500,000 |
| Standard 3-bedroom flat | 10–14 windows | ₦1,500,000 – ₦2,800,000 |
| Large / modern 3-bedroom flat | 14–18 windows | ₦2,800,000 – ₦5,000,000+ |
Individual window costs range from around ₦45,000 – ₦70,000 for a small, simple fixed window to ₦80,000 and above for a large, premium modern design with quality glass and powder-coated finishing.
These figures reflect 2026 market rates and include fabrication and standard installation. Always request a written, itemised quotation.
How Long Aluminium Windows Last in Nigeria (2026 Durability Guide)
How Many Aluminium Windows Does a 3 Bedroom Flat Need?
This is a question most homeowners ask only after construction is underway — and by then it is harder to plan the budget properly. The answer depends on your floor plan, but a typical Nigerian 3 bedroom flat breaks down roughly like this:
| Room | Number of Windows |
|---|---|
| Master bedroom | 2 windows |
| Bedroom 2 | 1–2 windows |
| Bedroom 3 | 1–2 windows |
| Living room | 2–3 windows (often larger) |
| Kitchen | 1–2 windows |
| Bathrooms / toilets | 1–2 small windows |
| Corridor / balcony (if applicable) | 1–2 windows |
| Total | 10–14 windows |
This is the standard range for a conventional Nigerian 3 bedroom flat. Larger, more modern layouts with open-plan living areas, wide balconies, or multiple bathrooms can push the count to 16 or 18.
Knowing your window count before you approach a fabricator puts you in a much stronger position to evaluate whether the quote you receive is reasonable.
Types of Aluminium Windows Best Suited for a 3 Bedroom Flat
Choosing the right window type for each room makes a practical difference — in ventilation, security, maintenance, and the overall look of the finished flat. Here are the five types most commonly used in Nigerian 3 bedroom flats.
1. Sliding Aluminium Windows
Sliding windows operate on a horizontal track, with one or more panels gliding open rather than swinging out. They are one of the most popular window types across modern Nigerian homes because they do not require exterior clearance to open, making them practical in tighter layouts.
They work well in bedrooms and kitchens where a clean, space-efficient look is the priority. The main maintenance point is keeping the track free of dust and debris, which can cause the panels to drag over time.
Best for: Bedrooms, kitchens. Pros: Space-saving, easy to operate, modern look. Cons: Less airtight than casement when closed; track requires periodic cleaning. Cost range: ₦75,000 – ₦120,000 per window.
2. Casement Aluminium Windows
Casement windows are hinged on one side and open outward or inward. They provide the best natural ventilation of any standard window type and seal more tightly against rain when closed — both meaningful advantages in Nigeria’s climate.
They are a strong choice for living rooms and master bedrooms where airflow and security are priorities. The main consideration is exterior clearance; the window needs room to swing open without obstruction.
Best for: Living rooms, master bedroom. Pros: Excellent ventilation, secure seal against rain, durable. Cons: Requires outward clearance space; slightly higher cost than sliding. Cost range: ₦110,000 – ₦150,000 per window.
3. Fixed Aluminium Windows
Fixed windows do not open. They are designed for light and aesthetics — used in spaces where ventilation is not needed but a clean, modern appearance is.
Fixed windows are low-maintenance options because they have minimal or no moving parts. You will find them commonly used in bathrooms, stairwells, corridors, and as accent panels alongside larger operable windows.
Best for: Bathrooms, stairwells, corridors. Pros: Affordable, very low maintenance. Cons: Limited or no ventilation control. Cost range: ₦90,000 – ₦130,000 per window.
4. Projected / Awning Aluminium Windows
Projected or awning windows are hinged at the top and open outward from the bottom. The opening angle creates a natural awning effect, which means they can stay open during light rain without water entering the room — a genuinely useful feature in Nigeria’s rainy season.
They cost slightly more than sliding or fixed options but deliver strong ventilation and weather performance in rooms like kitchens and utility areas where fresh air matters but rain exposure is a concern.
Best for: Kitchens, utility areas. Pros: Ventilation remains possible during rain, good weather seal. Cons: Slightly higher cost, requires exterior clearance. Cost range: ₦110,000 – ₦150,000 per window.
5. Frameless and Transom Aluminium Windows
Frameless and transom windows use significantly less visible aluminium framing than conventional designs, putting the focus on the glass. The result is a sleek, contemporary look that is increasingly popular in newly built flats and duplexes in Lagos, Abuja, and Benin City where homeowners want a modern, European-style finish.
They work similarly to casement windows — opening inward or outward — but the minimal framing creates a noticeably higher-end appearance and allows more natural light into the space. They are also more complex to fabricate and install correctly, which is why the quality of the fabricator matters more for this window type than any other.
Best for: Living rooms, master bedrooms, modern 3 bedroom flats with contemporary architecture. Pros: Ultra-modern appearance, more natural light, high-end finish. Cons: Higher cost, installation quality is critical, slightly less insulation than fully framed windows. Cost range: ₦115,000 – ₦160,000+ per window.
Cost of Aluminum Windows in Benin City (2026 Price Guide)
Comparison Table: Aluminium Window Types for a 3 Bedroom Flat
| Type | Cost Per Window | Ventilation | Security | Best Room |
|---|---|---|---|---|
| Sliding | ₦75,000 – ₦120,000 | Medium | Medium | Bedrooms |
| Casement | ₦110,000 – ₦150,000 | High | High | Living room |
| Fixed | ₦90,000 – ₦130,000 | Low | Medium | Bathrooms |
| Projected / Awning | ₦110,000 – ₦150,000 | Very High | High | Kitchen |
| Frameless / Transom | ₦115,000 – ₦160,000+ | High | Medium | Living room, Master bedroom |
Factors That Affect the Total Price of Aluminium Windows for a 3 Bedroom Flat
The price quoted by two different fabricators for what appears to be the same window can vary by 40% or more. Understanding why helps you evaluate quotes intelligently rather than simply choosing the lowest number.
Aluminium profile grade. Heavy-duty profiles cost more than standard thickness but last significantly longer and resist bending under heat and pressure. This is the most important variable in the total window budget.
Glass type. Plain glass, frosted glass, and tinted glass all carry different price points. Tinted glass reduces heat and UV penetration, which matters for furniture protection and interior comfort. Frosted glass provides privacy for bathrooms. The glass type appropriate for each room affects both cost and performance.
Glass thickness. Common options in Nigeria are 4mm, 5mm, and 6mm. Thicker glass is stronger, safer, and better at reducing heat transfer. Going to 5mm or 6mm for living room and bedroom windows adds cost but noticeably improves the feel of the finished installation.
Window size. Floor-to-ceiling windows cost considerably more in both materials and labour than standard-height windows. The dimensions of each opening in your floor plan directly affect the total.
Number of panels. A single-panel casement window costs less than a double or triple panel equivalent. Panel count also affects the weight and complexity of the hardware required.
Mosquito netting and burglar-proof grills. Both are commonly added to Nigerian windows and both carry additional costs. Mosquito netting adds ₦10,000–₦30,000 per window. Burglar-proof steel grills add ₦30,000–₦80,000 per window depending on the design. Planning for these upfront — rather than adding them after installation — reduces the total cost and disruption significantly.
Finishing colour. Mill finish (the natural silver aluminium look) is the least expensive, however, its not that common in the market. Powder-coated and anodised finishes cost more but offer better durability, richer colour options, and a noticeably more refined appearance.
Your location. Lagos and Abuja carry higher labour rates and sometimes higher material costs than cities like Benin City, Ibadan, or Enugu. Port Harcourt sits above the national average due to the local economy of the oil-belt. Factor this in when comparing quotes from fabricators in different cities.
Aluminium Window Prices Per Room in a 3 Bedroom Flat
This is the breakdown that most homeowners actually need — not a single total figure, but an understanding of where the money goes room by room.
| Room | Window Type | Estimated Cost |
|---|---|---|
| Master Bedroom | Casement × 2 | ₦220,000 – ₦300,000 |
| Bedroom 2 | Sliding × 2 | ₦150,000 – ₦240,000 |
| Bedroom 3 | Sliding × 1 | ₦75,000 – ₦120,000 |
| Living Room | Casement / Large Sliding × 2–3 | ₦300,000 – ₦420,000 |
| Kitchen | Projected / Awning × 1–2 | ₦110,000 – ₦400,000 |
| Bathrooms | Fixed × 2 | ₦180,000 – ₦260,000 |
| Total (estimate) | ₦1,035,000 – ₦1,740,000 |
This is a realistic range for a standard Nigerian 3 bedroom flat in 2026 using mid-to-good quality materials with professional installation. Flats in Lagos or Abuja will likely sit at the upper end of this range. Benin City and comparable cities will generally come in closer to the middle.
Common Mistakes Homeowners Make When Installing Aluminium Windows in a 3 Bedroom Flat
These are the errors that come up repeatedly — in consultation, in callbacks, and in properties that need early repairs.
Not Measuring Window Openings Before Ordering
Windows fabricated to incorrect dimensions either cannot be installed at all or require expensive corrections. Every window opening in your flat should be measured precisely — width, height, and depth of the reveal — before fabrication begins. A professional fabricator will do this measurement themselves before quoting. Be cautious of any contractor who quotes without visiting the site first.
Choosing the Cheapest Fabricator
A low quote is appealing during construction when every budget line is under pressure. But cheap fabricators typically use substandard aluminium profiles, cut corners on installation, and produce windows that leak, rattle, rust, or warp within the first two years. The cost of replacing or repairing those windows — including the disruption to an occupied flat — almost always exceeds the amount saved at the start.
Using Thin Aluminium Profiles to Reduce Cost
Thin profiles look similar to standard ones during installation. The difference becomes apparent when Nigerian heat causes them to expand unevenly, when pressure from wind causes visible bending, or when the hardware starts pulling loose from insufficiently thick framing. Specifying a minimum profile thickness before work begins is a reasonable protection.
Ignoring Glass Quality
Many homeowners focus entirely on the aluminium frame and treat glass as a standard commodity. It is not. Plain uncoated glass allows significant heat and UV into the flat, which raises interior temperatures and fades furniture over time. Tinted or UV-reflective glass costs more per window but pays back in comfort and reduced interior wear. For bathrooms and ground-floor windows, frosted and laminated glass options also offer meaningful privacy and security benefits.
Skipping Mosquito Netting and Security Mesh
These are consistently treated as afterthoughts and consistently regretted when added post-installation. Retrofitting mosquito nets to already-installed windows is more expensive and messier than integrating them during fabrication. Plan for them from the beginning.
No Proper Sealing Around the Frame
Water seeping through gaps between the window frame and the wall opening is one of the most common complaints from Nigerian homeowners after installation. Proper sealing — using quality sealant applied correctly — closes those gaps and prevents moisture from working its way into the wall, the ceiling, and eventually the interior. It adds little to the total cost but prevents damage that can run to several times the window’s value to repair.
⚠️ Warning: Many fabricators in Nigeria quote low prices but use substandard aluminium profiles that fade, warp, or loosen within 12 to 24 months. Before signing any agreement, request a physical material sample. Compare the weight and finish of the profile being quoted against what you see in the fabricator’s previous installations.
Aluminium Window Prices by Location in Nigeria
Where your flat is located will influence the final cost of your windows.
Lagos typically runs 10–20% higher than the national average, driven by high labour demand, traffic logistics, and the concentration of premium building projects that push market rates upward across all tiers.
Abuja carries premium pricing, especially in high-demand areas like Maitama, Asokoro, and Wuse. The market here is used to higher-end specifications, and pricing reflects that.
Benin City offers moderate, competitive pricing with reasonable access to quality local fabricators. It sits comfortably below Lagos and Abuja in cost without a meaningful drop in material or workmanship availability.
Port Harcourt runs slightly above average, shaped by the oil-belt economy and the strong demand from commercial and residential building activity in the region.
Ibadan, Enugu, and Kano are generally more affordable than Lagos and Abuja, with active local fabrication markets in each city that keep prices competitive.
If you are sourcing from a fabricator outside your city, add transportation cost to your calculations before comparing quotes.
What Happened on a Benin City 3 Bedroom Flat
At OJ Aluminum Fabrication, a client came to us while finishing a 3 bedroom flat in Benin City. The flat had 12 window openings — a mix of bedrooms, living area, kitchen, and two bathrooms.
The client had already received a quote from another fabricator using a thinner, cheaper profile. When we placed the two samples side by side and demonstrated the difference in weight, finish, and the way the cheaper profile responded to pressure, the decision shifted.
He went with the thicker, powder-coated profile. We installed a combination of sliding windows for the bedrooms, casement windows for the living room, projected awning windows for the kitchen, and casement windows for the bathrooms. Mosquito netting was integrated across all openable windows as part of the same installation.
Total cost came to ₦2,100,000 including fabrication, glass, netting, and installation. The finished flat looked noticeably sharper than comparable properties in the area. The client’s comment when we completed the job was simple: he wished he had made the same decision on an earlier property.
Quality aluminium windows are not just a functional choice. They contribute to how a property is perceived, how much it rents or sells for, and how much you spend maintaining it over the next 15 to 20 years.
Why Professional Fabrication and Installation Matter
A well-specified window installed carelessly is still a problem. The most common post-installation failures in Nigeria — water leakage around frames, panels that stick or rattle, hardware that loosens within months — are installation failures, not material failures.
Professional fabrication means the window is built to the correct dimensions, with properly mitred corners, square frames, and hardware fitted with the right tolerances. Professional installation means the window is set plumb and level into the opening, sealed correctly on all sides, and tested for smooth operation before the team leaves the site.
At OJ Aluminum Fabrication, we handle the complete process — measurement, fabrication, supply of quality profiles and glass, installation, and finishing — for aluminium windows, aluminium doors, roofing, office partitions, shop fronts, rain gutter systems, and showglass fabrication. Every job is built to withstand Nigerian weather conditions and to look as good in ten years as it does on installation day.
Frequently Asked Questions
How many aluminium windows does a 3 bedroom flat need in Nigeria?
A standard 3 bedroom flat in Nigeria typically requires 10 to 14 windows, depending on the design, number of bathrooms, and whether the flat has a balcony or corridor. Larger, more open-plan designs can push this to 16 or 18.
What is the total cost of aluminium windows for a 3 bedroom flat in Nigeria in 2026?
For a standard 3 bedroom flat, expect to budget between ₦1,400,000 and ₦3,000,000 for a fully installed set of quality aluminium windows. The final figure depends on window type, glass quality, location, and whether additions like mosquito netting or burglar-proof grills are included.
Which aluminium window type is best for a bedroom?
Both sliding and casement windows work well in bedrooms. Casement offers better ventilation and a tighter weather seal. Sliding windows are more space-efficient and suit layouts where exterior clearance is limited.
How long do aluminium windows last in a Nigerian flat?
High-quality aluminium windows, properly fabricated and installed, can last 15 to 25 years or more with basic maintenance. Cheap profiles with poor installation may begin showing problems within 12 to 24 months.
Does the price include installation?
Not always. Always confirm upfront whether the quoted price includes measurement, fabrication, delivery, and installation. At OJ Aluminum Fabrication, all of these are included in a single, transparent quotation.
Can I install burglar-proof grills together with aluminium windows?
Yes. Many Nigerian homeowners combine aluminium windows with internal or external burglar-proof steel grills for added security. This typically adds ₦30,000 to ₦80,000 per window depending on the design and complexity of the grill.
Ready to Install Quality Aluminium Windows for Your 3 Bedroom Flat?
At OJ Aluminum Fabrication, we handle everything from start to finish:
✅ Free measurement and consultation ✅ Custom fabrication to your exact specifications ✅ Quality aluminium profiles and glass supplied ✅ Professional installation across Nigeria ✅ Clean finishing with mosquito netting options
We have installed aluminium windows for numbers of flats, duplexes, and commercial buildings across Benin City, Lagos, Abuja, and beyond.
Do not guess your budget. Get an accurate, itemised quote today.
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