Builder Glossary

Building work can feel like a different world, especially when you start hearing terms you’ve never come across before.

Most people don’t deal with builders very often, so it’s completely normal to feel unsure about what things mean or what’s involved. You don’t need to know every detail, but having a basic understanding can make the whole process feel a lot less daunting.

This glossary breaks down common building terms in plain English. It’s here to help you understand what’s being discussed, ask better questions, and feel more confident when planning or managing work on your home.

A–Z building terms

Brickwork

Brickwork refers to the construction of walls or structures using bricks and mortar. It’s one of the most common parts of building work in UK homes.

It matters because the quality of brickwork affects both the strength and appearance of your home. Poor workmanship can lead to cracks or long-term issues.

Building regulations

Building regulations are official rules that set standards for construction work, covering things like safety, insulation, and structure.

They’re important because certain types of work must meet these standards by law. A builder should know when regulations apply and how to meet them.

Cavity wall

A cavity wall is made up of two layers of brick with a gap in between. This gap helps with insulation and prevents damp from getting inside.

You’ll often hear this term in relation to insulation or repairs. If there are issues, a builder can assess what needs to be done.

Damp proof course (DPC)

A damp proof course is a barrier built into walls to stop moisture rising from the ground.

If it fails or is missing, you might notice damp patches or peeling paint. Fixing it usually requires professional work.

Extension

An extension is when you add extra space to your home, such as a new room or larger kitchen.

It’s one of the bigger types of building projects. Getting it right involves planning, structure, and often multiple trades.

Footings

Footings are the concrete base that supports a wall or structure. They spread the weight and keep everything stable.

They’re usually hidden underground, but they’re essential for safety. This is not something to cut corners on.

Foundations

Foundations are the base of a building that supports the entire structure. They sit below ground level and carry the weight of everything above.

Strong foundations are crucial. Problems here can lead to serious structural issues, so it’s always a job for experienced professionals.

Insulation

Insulation helps keep heat inside your home and reduces energy loss. It can be added to walls, floors, and roofs.

It matters for comfort and energy bills. A builder may recommend improving insulation during larger projects.

Joists

Joists are horizontal beams that support floors or ceilings. They’re usually made from timber or steel.

You don’t often see them, but they play a key role in the structure. Damaged or weak joists need attention from a builder.

Lintel

A lintel is a support placed above doors or windows to carry the weight of the wall above.

If you’re adding or widening an opening, a lintel will be needed. Getting this right is important for safety.

Load-bearing wall

A load-bearing wall supports the weight of the structure above it. Removing or altering it without proper support can be dangerous.

If you’re planning to knock through a wall, a builder will need to assess whether it’s load-bearing and how to handle it safely.

Mortar

Mortar is the mixture used to hold bricks or blocks together. It also helps seal gaps and add strength.

Over time, mortar can wear away and may need repairing. This is known as repointing.

Planning permission

Planning permission is approval from your local council for certain types of building work.

Not all projects need it, but some do. A builder can often advise, but it’s worth checking early to avoid delays.

Repointing

Repointing is the process of renewing the mortar between bricks. It helps maintain the strength and appearance of a wall.

It’s often needed on older properties where mortar has started to crumble.

Rendering

Rendering is the process of applying a protective layer, usually cement-based, to the outside of a building.

It can improve both appearance and weather resistance. Cracked or damaged render may need repairing by a professional.

Screed

Screed is a smooth layer of material applied over a floor base, often before laying tiles or flooring.

It creates a level surface. If it’s not done properly, it can affect everything laid on top.

Structural engineer

A structural engineer assesses the strength and stability of a building. They often provide calculations for major changes.

You may need one if you’re altering load-bearing walls or planning large projects. Builders often work alongside them.

Subfloor

The subfloor is the layer beneath your finished floor. It provides support and stability.

Problems here can cause uneven floors or movement. A builder can investigate if issues arise.

Wall tie

Wall ties are metal connectors that hold the two layers of a cavity wall together.

If they fail, it can lead to cracks or instability. This is something a builder can inspect and fix if needed.

Final thought

You don’t need to remember every term on this page.

But having a basic understanding of how building work is described can make a big difference. It helps you feel more confident when discussing projects and makes it easier to understand what’s involved.

And when you’re dealing with something as important as your home, that extra confidence goes a long way.