What Drives Renovation Costs: The Main Factors

Renovation cost is shaped by floor area, scope, the starting condition, building services and the class of materials. Knowing how each factor works helps you keep the budget under control.

Quotes for two flats of the same size can differ several times over, and that does not always mean someone is overcharging or cutting corners. The cost of a renovation depends less on the square metres than on what is done within them. Looking at the cost drivers one by one helps you compare proposals fairly and see where the budget can be trimmed and where it should not be.

The starting condition of the property

Where you start matters as much as where you finish. A new-build flat handed over as a bare shell needs no demolition, but screed, plaster and every service have to be installed from scratch. In an older building, demolition, waste removal and stripping old layers come first, and opening the walls can reveal corroded pipes, a sagging ceiling or inadequate wiring.

Surface geometry also counts. The more uneven the walls and floors, the more material and labour it takes to straighten them. Any figure given without a site visit and a measured survey is therefore only provisional.

Location and site conditions are taken into account too. Carrying materials to an upper floor without a goods lift, getting waste out of the building, house rules that allow noisy work only at certain hours, or night shifts in an office that must keep operating all add labour hours and therefore cost. When comparing proposals, make sure every contractor has been given the same description of these conditions.

Scope and complexity of work

A cosmetic refresh – paint, new flooring, a few sanitary fittings – is very different from a full renovation. Changing the layout, removing and rebuilding partitions, or moving the kitchen or bathroom increases the scope sharply.

Complexity is a separate factor. A flat ceiling and a multi-level plasterboard ceiling with concealed lighting, a simple tile layout and a diagonal or large-format one, a plain wall and decorative panelling do not take the same effort. Every detail translates into a tradesperson’s time and precision.

Building services

Invisible work often takes a serious share of the budget. Rewiring, a new distribution board, replacing water and drain pipes, underfloor heating, air-conditioning lines and ventilation all have to be done before walls and floors are closed, and changing them later costs far more.

It is tempting to economise here because the result cannot be seen. Yet poor wiring or a badly made pipe joint can ruin the new finishes as well.

Material class and origin

Materials that do the same job come at very different levels: porcelain tiles, laminate, parquet or natural stone; basic or designer sanitary ware; standard or made-to-order doors. The choice affects not only the purchase cost but the labour too. Large-format tiles, for example, need a flatter substrate and a more experienced installer.

Imported and special-order items bring delivery times and logistics into the picture. Once a batch sells out, matching the same shade can be difficult, so a reserve quantity is bought upfront.

Design, management and timing of decisions

A design project, technical drawings and site supervision look like extra costs, but they often lower the overall bill by preventing mistakes. Without a project, decisions made on site lead to extra demolition and work done twice.

Late decisions also turn into money. When materials are not chosen on time, workers wait, the schedule breaks down and some tasks get split into two visits. Every change made during the works – even moving a socket – affects work already completed.

Care is also needed when picking the lowest quote. A low figure is sometimes achieved by leaving items out of the estimate – demolition, waste removal, preparation layers, primer or waterproofing. When these later reappear as “extras”, the final cost exceeds the original expectation. Comparing proposals line by line on scope, rather than on the bottom line, is far more reliable.

Checklist for keeping costs under control

• Ask for an estimate only after a site visit and accurate measurements.
• Make sure labour and materials are listed separately.
• Do not economise on concealed work; finishes offer far more room for choice.
• Select and approve materials before the work starts.
• Agree changes in writing and ask how they affect cost beforehand.
• Keep a contingency in the budget for unforeseen work.

Zaferoğlu İnşaat prepares design projects with drawings and computer models for apartments, offices and food-service venues, and the scope of work is much clearer in such a project. Bring a measured plan of your property and we can list the scope of work together, which shows where the cost will come from.