Draw a Roof: Comparing Gable and Hip Forms

Object Drawing Lessons

This lesson teaches a simple line-drawing convention for comparing two common roof forms: the gable and the hip. You will draw each roof as a set of straight edges and labelled lines, not as a textured or shaded illustration. The goal is to show how the ridge, eaves and sloping planes differ between the two forms so a viewer can tell them apart at a glance. Work on plain paper with a pencil and ruler. Keep all measurements in centimetres and label every line you intend to compare. Because letter styles and handwriting vary, the rubric rewards clear labelling and correct geometry rather than a single perfect letter shape.

Practice materials: Printable downloads are not available for this lesson yet. Use the instructions and four exercises below.

Set up a comparison plate

Divide your paper into two equal columns with a light vertical guide line. Label the left column GABLE and the right column HIP. Leave a 2 cm margin at the top for a title and a 3 cm strip at the bottom for notes. In each column, draw a horizontal baseline to represent the wall top; this is the eave line. Use a ruler so both baselines are the same length, for example 10 cm, and mark the ends clearly.

Above each baseline, decide the roof height. A simple choice is 5 cm from the baseline to the ridge. Mark the ridge height on both columns at the same level so the comparison is fair. These numbers are hypothetical examples; measure your own paper and choose values that fit.

1. Draw two 10 cm horizontal baselines, one per column, at the same height on the page.
2. Mark a ridge height of 5 cm above each baseline using a light tick mark.
3. Label both baselines EAVE and write the length beside each.
4. Leave space above the ridge for the roof outline and below the eave for notes.

Draw the gable roof outline

A gable roof has two sloping planes that meet at a single ridge running between two opposite walls. In side view, the outline is a triangle sitting on the eave line. The ridge is a point in this view, but you should still label it because the ridge line runs front to back. Draw two straight lines from the eave ends up to the ridge point. These are the sloping edges. Keep them straight and equal in length if the roof is symmetrical.

Add a short horizontal line at the ridge point to suggest the ridge running away from the viewer. Label the two sloping edges SLOPE and the ridge point RIDGE. Do not add shingles, shadows or texture; the comparison depends on clean outlines.

1. From the left eave end, draw a straight line up to the ridge tick mark.
2. From the right eave end, draw a straight line up to the same ridge tick mark.
3. Draw a short horizontal line at the ridge to show the ridge direction.
4. Label SLOPE on each sloping edge and RIDGE at the top.

Draw the hip roof outline

A hip roof slopes on all sides, so in side view the outline is a trapezoid: a flat top instead of a point. The flat top represents the ridge seen end-on. Draw two sloping lines from the eave ends up to the ends of a short horizontal ridge line. The ridge line should be shorter than the eave line and centred above it. For a 10 cm eave and a 5 cm height, a 4 cm ridge is a reasonable hypothetical example.

Label the horizontal top line RIDGE and the two sloping edges HIP SLOPE. Because all sides slope, the hip roof has no vertical gable end in this view. That difference is the key comparison point: gable shows a triangle, hip shows a trapezoid.

1. Mark a 4 cm horizontal ridge line centred 5 cm above the eave baseline.
2. Connect each eave end to the nearest ridge end with a straight line.
3. Label the top line RIDGE and the sloping lines HIP SLOPE.
4. Check that the ridge is shorter than the eave and centred above it.

Label and compare

Add a small comparison note under each column. For the gable, write: one ridge point in side view, two sloping planes, triangular outline. For the hip, write: short ridge line, four sloping planes, trapezoidal outline. Use the same letter height convention throughout: x-height is from baseline to midline, and capitals reach the top line. Letter styles vary, so neatness and consistent height matter more than a particular font.

Finally, draw a light dashed line between the two ridge labels and write SAME HEIGHT. This shows the comparison is controlled. Check every label points to the correct line and that no line is left unlabelled.

1. Write the comparison note under each column using the same letter height convention.
2. Draw a dashed line between the two ridge labels and label it SAME HEIGHT.
3. Check that each label touches or points clearly to its line.
4. Erase stray construction marks before finishing.

Worked example

On a 12 cm eave line, draw a gable roof with a 6 cm ridge height and a hip roof with a 5 cm ridge line, both at the same height. Label the ridge and slopes.

Four practice exercises

Common mistakes

• Drawing the hip roof with a pointed ridge like a gable. Use a short horizontal ridge line for the hip so the outline is a trapezoid, not a triangle.
• Making the two roof outlines different heights, which ruins the comparison. Mark the ridge height on both columns at the same level before drawing either outline.
• Adding shingles, shadows or texture that hide the outline. Keep the drawing to clean straight lines and labels only; texture is outside this study.
• Leaving sloping edges unlabelled or labelling the wrong line. Point each label clearly to its line and check every line has exactly one label.

Self-check rubric

• Both roofs share the same eave length and ridge height level.
• Gable outline is a triangle with two straight sloping edges meeting at a ridge point.
• Hip outline is a trapezoid with a short centred ridge line shorter than the eave.
• Every ridge and slope line is labelled clearly and correctly.
• Letter height follows the baseline-to-midline convention consistently.
• No texture, shading or unlabelled construction lines remain.

Questions and answers