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The Calculation Method For The Cost Of Thermal Break Windows & Doors

The Calculation Method For The Cost Of Thermal Break Windows & Doors

November 28, 2022

General speaking, the factors affecting the price of aluminum windows can be classified into material cost and design cost. Let’s analysis the price of aluminum windows from these tow factors as follow,

Firstly, its the material cost :

According to the cost element method, the main factors affecting the price of aluminum doors and windows are: profiles, glass, hardware. The corresponding cost proportion is generally profiles (about 30% to 40%), glass (about 15% to -20%), hardware (about 8% to 10%).

Thermal Break Windows & Doors

1.The cost of profile

Aluminum profile price = Aluminum Ingot price + Aluminum profile processing fee + transportation fee


Aluminum Ingot price

Based on the ingot quotation and A00 aluminum ingot spot price (the average of the highest and lowest price) in the region on a reference date (the date of issuance of the bid, the date of return of the bid or the date of placing the order).

Ingot prices are mainly affected by market conditions and changes, generally agreed within ± 10% without adjustment (calculated with an aluminum content of 10kg/㎡, the price risk is about 13 RMB / flat, accounting for about 2% of the integrated unit price of broken bridge doors and windows 600 RMB / square meter).


Aluminum profile processing fee

It refers to the delivery price within the province (the province location of processing ), including all costs such as labors and machine costs, losses, package, film, intra-provincial transportation, risks, management fees, profits, taxes (17% VAT), etc. for processing aluminum ingots into aluminum profiles, generally excluding the unloading fee at the delivery place of aluminum profiles.

There is a refund when the annual purchase volume reaches the agreed tons (generally 2000 or 3000 tons), and the approximate market price is 200RMB per ton.


a.The difference of brand

The second-line brand is about 8% lower than the first-line brand, measured by the profile processing cost of 12% of the overall unit price of doors and windows, the impact of 0.96%.

b. The surface treatment:

Anodizing, powder coating, electrophoretic coating, fluorocarbon coating and other prices in increasing.

c. Thermal break or non-thermal break

Thermal break system is 2500RMB/ton expensiver  than non-thermal break, mainly to increase the cost of insulation strips (domestic type), if its the imported strips, plus 2000RMB/ ton. The types of heat insulation strips, including glue-injection type and strip-through type, generally use strip-through type.


Thermal break or non-thermal break


The element of cost

Different from vinyl profiles, the main aluminum profiles in the market are all domestic brands, and the price difference between them is quite small. The imported thermal insulation strips are better than the domestic ones, but is the cost difference of about 2000 RMB/ton worth it? For 1500*1500 window for example, the difference of 2000 RMB/ton is about 18 RMB/sqm, if the ratio of window to ground is 0.2, the difference is 3.6 RMB/sqm. 


a.Packing method: The packing cost accounts for 3%~5% of the total aluminum unit price, there are two ways of paper packing and plastic film packing.In General is paper packaging, when using paper packaging , it should be agreed that the weight of paper in each ton, which is generally ≤ 60Kg. such as using film packaging plus 1000 RMB/ton.

b.The thickness of oxidized film: it is generally designed according to the minimum thickness required by the specification. For every 1um increase, the profile processing cost increases by 100 RMB/ton.

c.Pound difference: 3‰ allowed by general agreement.

Transportation fee

It refers to the transportation cost from the aluminum profile processor to the aluminum door and window manufacturer, generally 500~800 RMB/ton, adjusted according to the fact according to the transportation distance and different ways.


2.Glass supply price

window & door glass


Formula: Glass supply price = raw sheet price + further processing fee + long-distance transportation fee

A.Raw sheet price

First-line brands are 10% more expensive than second-line, according to the glass in the unit price of windows and doors accounted for 20% of the calculation, the impact of 2%.

B.Advanced processing fee

Glass advanced processing is divided into original processing and off-site processing according to different processors, and the price difference depends on other factors. According to the market reputation of the processors, they are divided into first-line brands and second-line brands, and the first-line brands are more expensive than the second-line ones.

C.Transportation fee

It is necessary to pay attention to the production sites of advanced processing manufacturers in the country, and choose the manufacturer with the shortest possible distance after considering the project location. If the project has a local factory, the transportation cost is 0. In other cases, according to the distance, the transportation cost of 5mm glass in the country is about 1~10 RMB/㎡, and other thicknesses are increasing proportionally according to the thickness difference.


The element of cost 

For the choice of glass, it is enough to meet the relevant strong article and local energy-saving acceptance standards. In general, double white hollow can meet the requirements. 60 RMB unit price difference between LOW-E and ordinary glass, equivalent to about 10 RMB/m2 per square of the building, if Low-E glass can be used as a selling point, the cost investment of 10 RMB/m2 can bring 50 RMB/m2 or even 100 RMB/m2 increase in selling price, you can choose Low-E glass.



According to the weight of the door and window sash, the design of optional hardware (nominal load-bearing capacity should be more than 1.5 times the actual load), the movable hardware should be able to meet the use of more than 100,000 times as the A-class products.

The main hardware includes 4 types: handles, actuators, locking seats, friction hinges.

Main materials and price difference: Stainless steel > zinc alloy > aluminum alloy.

Brand differences: the price of each brand grade of hardware is very big differences.

Imports are more expensive than domestic; the first line of domestic brands are 15% more expensive than the second line, hardware accounts for 10% of the entire unit cost of doors and windows, which means that the impact on the cost of 1.5%.


The element of cost 

Consumers are less sensitive to hardware than glass, domestic hardware brands can be satisfied. Such as KIN LONG.


4.Auxiliary materials

In a comprehensive view, the cost of auxiliary materials used in aluminum doors and windows is about 40 to 100 RMB/set.


5.Labor cost

Factory processing, testing and packaging are included in the aluminum doors and windows project.


Secondly, the analysis of design series affecting the price of aluminum doors and windows.

1.The sizes of the windows and doors and the opening ways

A.The area of each sash:

By the basic area of each increase or decrease of 0.5 square corresponds to a corresponding reduction in the unit price, an increase of about 5%. When the single area is greater than 1.5 square meters, the glass must be tempered glass, single glass cost increased by more than 20%. The doors and windows also need to pay attention to the bright sub, bright sub height below 400 when very uneconomical, it should be considered to cancel.

By making appropriate adjustments to the window and door opening sizes and compartment sizes, a better economical window and door division size will be obtained, and a more reasonable single-party cost will be obtained.


B.The opening ways :

The more sash are opened, the more hardware is required and the higher the cost.

In the same single unit, adopt thermal break and non-thermal break and use non-thermal break as much as possible; in the opening way, try to open less, less swing, that is, "big fixed small open, more fixed less open, more sliding less swing". For example, some projects use "main room casement windows, secondary room sliding windows".


6. With U-value with requirements.

Some customers located in cold or hot areas have certain requirements for the performance of windows and doors. Especially in North America, the country requires energy saving, because the doors and windows on the building, customers have energy saving requirements at the same time, and in this regard, it is best to measure by U-value.

The lower the U-value factor, the better the thermal insulation performance of the doors and windows, but the higher the relative requirements and the more costly materials used. Therefore, this becomes a factor affecting the U-value.



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