how to measure a replacement window

How much does window replacement cost

window replacement cost
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How to measure a replacement window

How to measure windows yourself

The cost of manufacturing a new window depends mainly on its size. Therefore, almost every customer has the opportunity to measure the opening and send the data to calculate the preliminary cost.


Of course, for the preliminary measurement is not necessary to adhere to the maximum accuracy. However, if you want to get a reliable value of the window price, you must measure with some rules.

The opening should be measured in width and height in three places. The width is measured at the center, right and left edges. Size is measured in the center, at the top and bottom of the window. In this case, both in width and height, the smaller of the three values obtained will be the final size.

The order of measurement on the width and height of the window will be different. It also depends on the type of opening installed in a new window - with or without quarters.


In openings without a quarter (Fig. 1), the standard documentation provides for the device of gaps for mounting seams width of 15-55 millimeters. However, performing a hole of about 30 mm in most cases is recommended. Therefore, to obtain the size of the window from the measured width of the opening, subtract 60 millimeters (30 mm on each side).

If installing a window into an opening with a quarter (Fig. 2), measure the window's width using the outside dimension of the quarter. The measurement is also made in three places, selecting the smaller value. The window's width should be 20-30 millimeters larger than the outside dimension of the opening. With a greater width, the window can go a quarter too deep, deteriorating the appearance and making it impossible to install a mosquito net. Therefore, you must add 40-60 millimeters to the data obtained when measuring.


When measuring the height of apertures with quarters (Fig. 4), measure from the outside from the top edge of the opening to the sill, while you need to add to the leading edge of the opening 15-20 millimeters. In installing an aperture without a quarter (Fig. 3), it is necessary to subtract 60-80 millimeters from the received height (the size of a standing profile is taken into account).


installation of the sill is carried out strictly under the bottom edge of the window frame, which requires observance of the necessary clearance;

installation of the drip molding is carried out precisely to the lower edge of the window frame, and the essential clearance must be observed;

  • if the opening has an upper quarter, the frame return must not exceed 20 mm;

If the sill has an upper quarter, the frame overlap must not exceed 20 mm;

  • the installation clearance must be 15-30 mm in the absence of an upper quarter

The size of the installation gap in the absence of an upper quarter must be 15-30 mm;

  • The window sill must protrude freely under the window frame.

Observance of these requirements will give a relatively accurate value, but a specialist fitter must carry out the final measurement.


Determining the size of the sill and window sill for a layperson is difficult. Therefore, the results obtained are only approximate. Do not be guided by the size of the existing window sill and sill, as the width of the new window can be very different from the old. The determining parameter is the width of the wall.

The sill should protrude from the wall at about 5 millimeters. Such an overhang allows for normal drainage while preventing damage to the sill from falling objects from above. In addition, the sill ledge is recommended so that it does not overlap the radiator by more than half. Thus, to determine the total width of the window sill and the drip molding, subtract the width of the base profile from the width of the wall and add the values of the necessary gaps. The individual width of each element will depend on the distance at which the window will be installed from the outside of the wall.

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What is the best replacement window

  • If you have a PVC window replacement that has been in use for a long time, or your window, after a long time, has become unsuitable for further use, you should consider repairing or replacing the window system. It is impossible to choose a universal solution to the problem because each case is different.
  • When is it not necessary to replace it
  • It is blowing out of the soffits or window construction along its perimeter - window companies near me.
  • As the profile is used, the installation joints along the edge of the frame begin to let in street air because the joint material like foam gradually deteriorates, causing drafts. In this case, you can do without replacing the window unit. It is worth foaming the frame again, removing the previous foam before. If the mounting seams are under the plastic, you should remove the PVC, and after the reconstruction of the product - put it back in place.
  • Damage to the seals.
  • The sealing contours of long-established frames, usually made of rubber, can be damaged because the material over time loses its elasticity, gives cracks, and no longer fits closely to the edge. As a result, the sash and frame do not close tightly, and the structure blows. The "aged" seals should be replaced.
  • More modern products are made of silicone or polymers. They are much more durable than those made of rubber and last up to 15 years. But all the same cracked or hardened parts are better to change promptly. Choosing seals of the correct diameter, they are placed in the grooves on the frame, from which the old parts are first removed.
  • Insulating glass unit damage.
  • The glazing unit with a crack or hole must be replaced. It is dangerous to use products with a damaged insulating glass unit. It is enough to replace the latter with a new one, focusing on the dimensions of the old package. The frame does not need to be replaced.
  • Condensate accumulation.
  • Suppose condensation forms inside the profile system, the cause of such a phenomenon may be not only due to improper installation of the window. It also occurs due to high humidity. Do not rush to look for and install a new frame. To solve the problem, it may be enough to cut a supply valve into the system so that fresh outside air can flow into the room through it.
  • When is it recommended to replace the profile?
  • The fitters installed the window incorrectly - with a misalignment so that the sashes do not open or do not close.
  • It is planned to change the window configuration - hinged balcony glazing on the blind or vice versa.
  • We need a system of different shapes and dimensions.
  • The design has lost its attractiveness and is obsolete.
  • Repair at more than half the price of a new window.

Repairs in such cases will only help to correct the problem for a short time. The window products should be replaced on time to avoid new or repeated trials. However, if the problem is tiny, it is better to limit the repair without changing the entire PVC system. Do not rush to change the window because you want to change the interior. Modern window decoration products such as window linings and lamination will help you update a long-used profile.