50 Specialist Calculators
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Professional tools for serious builders

An orangery or sunroom is a premium extension choice that brings warmth, light and year-round usable space to a home. Unlike a standard conservatory, an orangery incorporates substantial brickwork in its base walls - the dwarf walls or knee walls that sit below the glazing and give the structure its solidity and character. This brickwork is what distinguishes an orangery from a lean-to and makes accurate material planning more involved.

The build sequence starts below ground with strip foundations and sub-base preparation, then moves up through the brick dwarf walls and their mortar, to the internal floor screed, external render on the brickwork, and finally the interior decorating. Getting the brick count right is particularly important - different brick sizes and bond patterns affect quantities significantly, and a shortfall mid-build is both expensive and time-consuming to resolve if the batch is unavailable.

This kit covers every material stage from foundations through to internal finishes: foundation concrete, aggregate sub-base, brickwork and mortar for the dwarf walls, floor screed, external render on the brick surfaces, and interior paint for any plastered areas. Enter your structure dimensions once and each calculator opens pre-loaded with your measurements.

What this kit covers

Work through these 7 calculators in order. Each one uses your structure dimensions to pre-fill the key inputs - just refine the details and save each result to your project.

1
Brick Calculator
Calculate bricks for the dwarf walls (knee walls) that form the base of the orangery or sunroom structure.
Open calculator
2
Masonry Mortar
Work out sand and cement quantities for laying the brickwork dwarf walls.
Open calculator
3
Concrete Volume (foundations)
Calculate the foundation concrete volume for the perimeter strip foundations supporting the structure.
Open calculator
4
Aggregate & Ballast
Work out sub-base and ballast quantities for the floor slab base and foundation trenches.
Open calculator
5
Concrete Screed
Calculate screed quantity for the internal floor, typically laid over insulation to achieve a level surface.
Open calculator
6
Render & Plaster
Calculate external render for the dwarf walls and any internal plastering to the brick surfaces.
Open calculator
7
Interior Paint
Work out paint quantities for any internal plastered surfaces, ceiling and internal brick walls.
Open calculator

Start this project

Enter your structure dimensions and we'll create a project with pre-filled starting points for each calculator.

Height of the brick knee walls below the glazing
Overall internal height to the roof lantern or ridge

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