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Where a renovation budget goes: five lines worth knowing in advance
The finishes you can see are only part of the cost. Here is how an estimate is put together and where unplanned spending usually appears.
- budget
- renovation
When people plan a renovation, they usually count what is visible: tiles, parquet, a kitchen, a sofa. In practice a large share of the money goes into what ends up hidden in the walls and under the floor. Below is the budget structure I use to open any conversation about an estimate.
The five main lines
- First-fix works and services: partitions, screed, electrics, plumbing, ventilation and air conditioning
- Finishes: materials and labour for floors, walls and ceilings
- Bespoke joinery: kitchen, wardrobes, dressing rooms, doors
- Lighting, sanitaryware and appliances
- Loose furniture, textiles and decor
The proportions vary from one property to another, but the first two lines together usually come to more than half. They are also the hardest to save on: redoing the electrics or waterproofing after the finishes are in means renovating twice.
Where the budget drifts from the plan
Most often in small items missing from the first estimate: delivery and carrying up, consumables, waste removal, spare tiles, hardware, appliance installation. Each sum is small; together they are noticeable. That is why I include a 10–15% contingency and show it as a separate line.
The second reason is decisions made mid-build. Every material swapped on site triggers changes in the details around it. A thorough project with schedules exists precisely so that those decisions are made on paper, while they still cost nothing.
How to keep the budget in hand
Name your ceiling before design begins. Materials and furniture are then selected to fit it from the start rather than cut back later. Split the budget across the lines and decide what matters most to you: if it is the kitchen and the lighting, the sofa can be simpler.
One last point: expensive materials earn their place where you touch them and look at them every day — a worktop, door handles, the hallway floor. Elsewhere, sensible restraint only does an interior good.
