Do I need an architect to get an accurate quotation?

Not necessarily for a straightforward replacement project, but for new openings, extensions or self-builds, architect's drawings give a much more accurate and useful basis for quotation.

Can a quotation be produced from a hand-drawn sketch?

A rough guide figure can sometimes be given, but accuracy improves considerably with a scaled drawing or, failing that, precise measurements and clear photographs.

What file format should I send drawings in?

PDF is generally the most reliable and widely usable format; CAD files can also be useful if available, particularly for larger or more complex projects.

Will the quotation change once a site survey happens?

It may, particularly if the survey reveals a discrepancy between drawings and as-built conditions, or identifies remedial work not visible on drawings alone.

Installation

How to Prepare Drawings for a Window Quotation

A quotation is only as accurate as the drawings behind it. A little preparation upfront avoids repeated back-and-forth and a moving price.

3 min read

Written by Windows in the Lakes · A trading name of Home Glazing Ltd

At minimum, a glazing supplier needs scaled elevation drawings showing each opening with its width and height, a floor plan showing the property layout and orientation, and a note of which openings are windows and which are doors, including intended opening configuration. With that, most suppliers can produce a meaningful quotation before a site survey.

Whether you are working from an architect's drawing set, a builder's sketch, or your own measurements for a straightforward replacement project, the quality of information you provide directly affects the quality and accuracy of the quotation you receive. Vague or incomplete drawings lead to caveated, approximate quotations that can move significantly once a full survey happens.

This guide sets out what to include, how to present it, and the common gaps that cause quotations to be less accurate than they need to be.

What a supplier needs to see

Scaled elevation drawings for every wall containing an opening
A floor plan showing the layout and which elevation faces which direction
Width and height for each opening, clearly labelled
Whether each opening is a window or a door, and its intended configuration
Any structural information available, such as lintel positions or wall construction
Photographs of existing openings where the project involves replacement rather than new build

Drawings for different project types

Project type	What to provide
Like-for-like replacement	Photographs and approximate sizes are often sufficient for an initial quotation
Extension or new opening	Architect's elevation and plan drawings, plus structural details if available
Self-build	Full architect's drawing set, ideally at scheme or detailed design stage
Listed building or conservation area	Drawings plus any planning conditions relating to materials or appearance

What to provide by project type

Presenting information clearly

01Label every openingUse a consistent reference for each window or door — a code or room name — so it is unambiguous across drawings and correspondence.
02State the scaleConfirm the drawing scale so dimensions can be checked or extracted accurately if not individually annotated.
03Note orientationMark which elevation faces which compass direction, since this affects glass specification recommendations.
04Flag anything unusualHighlight sloped openings, structural constraints or bespoke configurations rather than leaving them to be discovered later.
05Provide file format that opens easilyPDF is usually the most reliable format for sharing drawings with a supplier.

When drawings are not available

For straightforward replacement projects, a full drawing set is not always necessary. Clear photographs of each opening from inside and outside, along with approximate widths and heights, are often enough to produce an initial guide quotation ahead of a full technical survey — see our guide to what happens during a survey for how that step refines the figures.

Decision criteria

If you have architect's drawings, share the full relevant set rather than a single elevation
If drawings are not yet finalised, say so — a supplier can advise on what is achievable while the design is still moving
If the project involves planning constraints, include the relevant conditions or correspondence
If you are unsure what to provide, ask the supplier directly what they need before spending time compiling drawings unnecessarily

Common mistakes

Sending unscaled sketches with no stated dimensions
Omitting orientation, which affects glass and solar control recommendations
Not labelling openings consistently, causing confusion in quotations with multiple items
Leaving out structural information that later changes the feasibility of an opening
Assuming a photograph alone is sufficient for a complex or new-build project

From a real Windows in the Lakes project

Near Penrith, Eden Valley · Whole-house remodel · 24 heritage windows, bifold and internal screens

A House Rebuilt Around Its Glazing

Twenty-four windows across two very different elevations — a formal, traditionally detailed frontage and a rear range intended to be almost entirely glass — risked reading as two unrelated buildings.

One system family and one finish across the whole house. Heritage casements with astragal bars answer the front elevation's proportions; the same profile, without bars, runs the glazed rear band and bifold. Internal steel-look screens repeat the sightline indoors, and matt black ties every opening together.

Read the project story

Next step

Considering aluminium windows for your own project?

We design, specify and install across Cumbria, the Lake District and the wider North. Send drawings, photographs or simply a description of the building and we will tell you what is possible and what it should cost.

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