Door Measuring Guide

Measuring Guide

You will require the following information in order to obtain a free no obligation quotation:

The height and width measurements of your door frame measured from edge to edge from the outside (see below). This will be the manufacturing size of the complete door and frame including any cill or frame extender which you require.

Alternatively you can measure the brick to brick opening size then deduct a suitable allowance for fitting; we suggest 10mm from both height and width.

You may need to remove a small amount of sealant, render or other obstructions to see the door frame edge; if in doubt please speak to an experienced surveyor or installer.


Door Width
The width should be measured at three points - top, middle and bottom of the opening.
The smallest of these measurements is taken as the width.
Door Height
The height should be measured at three points - left, middle and right of the opening.
The smallest of these measurements is taken as the height.


Installation guidelines

Please note - Failure to install a product correctly may render void any product guarantee. This document is meant to give guidelines for general situations only, in practice every installation is different and all installation work must be carried out by a competent, experienced fitter. 

Doorset removal and installation can be dangerous. Health and safety precautions should be observed at all times. 

1. Before starting

Before starting any work, especially removal of the old door and frame, the sizes, type and condition of all new products supplied should be checked against both the survey sizes as well as the actual aperture sizes. The new door set specification and door style should also be checked.

Before discarding, check any packaging for components that may be supplied loose, particularly lever handles, cills and end caps. Check that all these components are accounted for.

2. Checking

The door set outerframes must be installed plumb and square within the aperture, without twist, racking or distortion of any member. Repeatedly check the squareness and alignment of the outerframe during the installation process.

3. Positioning

The positioning of the new frame in the aperture is fundamental to the success of the installation. in general the replacement doorset shall-

- bridge the cavity

- cover the dpc

- be set back as far as possible in the aperture to minimise exposure to the elements.

4. Fixing

Fixing methods will be influenced by:

- the presence or absence of a wall cavity

- the nature of any cavity

- the relative positions of the frame and cavity

- the position of the plaster line, and the need to preserve the interior decorations.

- the design of the reveal

There are two principal methods of fixing available-

- through frame fixings

- lug fixings

As a general rule, only through-frame fixings are recommended for fixing of PVCu door sets. 

Acceptable positioning of frame fixings 

Preffered Alternate

Through-frame fixings should be plastic sheathed and of a minimum of 100mm in length, and shall penetrate a minimum of 50mm into the substrate. The head of any

through-frame fixing must be seated beneath the outer wall of the pvcu outerframe

member within the hollow chamber to prevent distortion or cracking of the frame.

A larger hole than that required for the fixing will need to be drilled in the outermost wall of the plastic outerframe member only, into which a cover cap should be inserted.  

5 Fixing distances

Generally, only two sides of the frame shall be secured using the following guidelines to determine the fixing spacing –

    - Corner fixings should be a minimum of 150mm and a maximum of 250mm in from the external corner

    - No mullion or transom fixings should be closer than 150mm, or further than 250mm from the centre line of a mullion or transom

    - Intermediate fixings should be at centres no greater that 600mm

    - There must be a minimum of 2 fixings on each jamb – The illustration below illustrates fixing positions 


6 Use of installation packers

Appropriately sized installation packers shall be used adjacent to fixing positions to prevent outer frame distortion during installation. Installation packers should be incompressible, resistant to rot or corrosion, and span the full width of the outer frame profile. The fixings should be tightened so that the frame is held securely against the packers. Take care not to over-tighten the screws and distort the frame.

NOTE: packers must be used adjacent to hinge/locking points. 


Efforts must be made during installation to ensure that debris such as wet plaster does not foul drainage paths nor impair operation of hardware. Neither sand and cement, nor plaster should be used to fill the gap between the frame and the structural opening.

All protective films placed on the profiles and door panel should be removed as soon as the installation is finished, and prior to perimeter sealing. 

8. Perimeter sealing

The purpose of a perimeter sealant is to prevent water & air leakage between the

aperture and the door set.

No joint width shall be designed to be less than 5mm. Local variations in the line of the brickwork may create gaps greater than 5mm.

There should be an expansion gap between 5mm and 10mm at the head of the frame.

When sealing perimeter joints take care to ensure any drainage channels are not blocked or obstructed.  

10. Door set operation & maintenance

Operating features such as key locks, hook-bolts and latches shall be checked and should be demonstrated so that the client and tenant know how to use them. This is especially important in the case of exits that may be used in fires.  

A copy of the Maintenance guidelines should also be provided to the client.  

Quick Find


Use keywords to find the product you are looking for.
Advanced Search

Conservatory Other



Edwardian Double Hipped

Edwardian Orangery

Gable End

Lean To

Lean To Side Hipped

P Shape

Victorian 3 Facet

Victorian 3 Facet Double Hipped

Victorian 5 Facet


0 items
Free Qhote
Whether you want a quote or just help and advice call us now on
0843 289 9342
01283 213 631
Free Delivery
Free delivery to anywhere in the UK Mainland. Absolutely NO charge for delivering your conservatory direct to your door!
Payment Options
All major credit and debit cards accepted.
Delta ExceptedVisa Electron ExceptedMaestro ExceptedMastercard ExceptedSolo ExceptedSwitch ExceptedVisa Excepted
Pay Monthly

Contact us for details Please click here

For full installation details click here