A new build looks like a blank canvas, and that is exactly where most mistakes begin. The order of works matters more than speed: every step relies on the one before it. Here is how a renovation in a new build unfolds, from the first budget line to the final coat of paint.

Step 1. Set the budget and the order of works

Split the budget into three parts: first-fix works, finishes, and furniture with appliances. As a rule of thumb the split lands near 40, 35 and 25 per cent, and it shifts depending on how much built-in joinery you plan.

Always keep a reserve of ten to fifteen per cent. On a new build the surprises are rarely dramatic, but uneven walls, a redesigned socket layout or a delayed delivery show up on almost every project.

Step 2. A design project, or at the very least a layout plan

The drawings that actually save money are not the renders. They are the measured survey, the demolition and construction plans, the socket and lighting layouts, the flooring and ceiling plans and the tile setting-out drawings.

Without them decisions get made on site, in a hurry, by whoever happens to be holding the tape measure. That is how you end up with a socket behind the fridge and a light switch behind an open door.

Step 3. First-fix works

Electrics, plumbing, levelling of walls and floors, waterproofing in wet areas, ventilation. Everything that disappears behind the finishes has to be right the first time, because correcting it later means demolition.

Photograph every service run before it is closed up. A year from now, when you want to hang a shelf or trace a pipe, those photos will save both money and nerves.

Step 4. About settlement

New buildings settle, and the first year is when most of the movement happens. That does not mean you have to wait: it means choosing finishes that tolerate small movements.

Flexible fillers at junctions, floating floors, expansion gaps under skirting. Rigid decorative plaster across a large wall in the first year is the one thing genuinely worth postponing.

Step 5. Final finishes and the last mile

Paint, tiling, flooring, doors, joinery, lighting fixtures. This stage is the visible one, and it is also where delays accumulate: made-to-order doors and furniture take weeks.

Order long-lead items early, ideally while first-fix works are still running. Waiting six weeks for a wardrobe in an otherwise finished flat is a familiar and entirely avoidable ending.

Where the budget actually goes

Owners consistently underestimate three lines: engineering services, joinery and lighting. Together they often take more than the visible finishes.

Tiles and paint are easy to price, so they get all the attention. Meanwhile the socket count, the ventilation solution and a proper lighting scheme quietly define both the cost and the comfort of the result.

Three mistakes of the first month

Buying materials before the layout is settled. Starting work without agreed drawings. Hiring a crew on price alone, without seeing finished work of the same type.

Each of these looks like a saving at the time and turns into a cost within weeks.

How long a renovation takes

First-fix works in a two-bedroom flat take between six weeks and three months, finishes another six to eight weeks. Including procurement and pauses, a realistic turnkey timeline runs from four to seven months.

The main source of delay is rarely the crew. It is waiting for materials and waiting for the client to decide.

Checklist before you start

Budget with a reserve. Agreed layout. Working drawings. A crew whose previous work you have seen in person. A written contract with stages, prices and an acceptance procedure. A schedule for long-lead orders.

Common questions

Can I start without a design project? You can, but the layout, socket plan and lighting plan should exist in some form before the first wall goes up.

How long should I wait because of settlement? You do not need to wait to begin. Choose movement-tolerant finishes and postpone rigid decorative surfaces.

What is the most expensive mistake? Anything hidden: waterproofing, wiring and pipework. Redoing them means removing everything installed on top.