Renovation budgets and timelines usually grow not because of material prices but because of avoidable mistakes. These ten are the ones we see most often on site — and the ones that cost the most.
1. The wrong sequence
Adding an electrical circuit after painting; doing drywall after the parquet is laid. Each means redoing finished work. For the correct order see the right order of works.
2. Changing decisions after strip-out
Moving the kitchen, changing the bathroom layout or relocating a wall after demolition has begun means the plumbing, screed and waterproofing must all be redone. Every decision should be settled before the strip-out.
3. Skipping waterproofing
Not applying a membrane beneath tiles in bathrooms and kitchens stays invisible in the short term and returns as leaks and damp in the long term. Waterproofing is not optional; it is standard.
4. Closing up without testing the services
An untested water line or electrical circuit that fails after tiling and plaster are complete means breaking out again. Every line must be tested before it is closed.
5. Laying flooring before the screed dries
Parquet laid without a moisture reading blisters; voids form beneath tiles. Schedule pressure must not push this step aside.
6. Choosing materials too late
When tiles, parquet and sanitaryware are chosen after work has begun, lead times leave the site idle. Materials should be selected and ordered before the strip-out.
7. Accepting “first class materials”
If the quotation does not name a brand, model or technical specification, comparison is impossible and expectations diverge during the work. Material descriptions must be concrete.
8. Starting without a contract or schedule
Without a written scope list, work schedule and payment plan, both duration and cost become uncertain. An itemised written quote and payment tied to completed work protect both sides. For choosing a contractor, see what to look for in a renovation company.
9. Trying to coordinate separate trades yourself
When electrician, plumber, drywaller, painter and floor layer are hired separately, sequence and responsibility blur; each waits for the other, and when something goes wrong nobody owns it. One responsible team removes that risk.
10. Ignoring building rules
Starting without informing management, disregarding working hours and failing to protect communal areas leads to complaints, stop-work orders and strained neighbour relations. See renovating in an apartment building.
Checklist before you start
- Are the scope and layout decisions made?
- Are materials selected and ordered?
- Is there an itemised written quote and schedule?
- Are waterproofing and service testing included in the scope?
- Has the building management been informed?
- Is there a contingency for unexpected costs?
If the answer to all six is yes, most of the expensive mistakes have already been prevented.
Demgirişim delivers renovation and repair with one team and a written schedule; waterproofing and service testing are standard practice.
Frequently asked questions
What is the most expensive renovation mistake?
Changing a layer beneath finished work: services inside a closed wall, waterproofing under tiles or screed under parquet. These create the cost of doing the job twice.
Why is starting without a contract risky?
When scope, materials and duration are not in writing, disputes come down to personal recollection. An itemised written quote and contract protect both parties.
How costly is changing your mind during the work?
Changes before strip-out are free; after construction starts every change means demolition, materials and labour repeated. Finishing decisions before strip-out is the biggest saving available.
The initial consultation and written quote for Renovation & Repair are free within Istanbul. Scope, duration and cost are confirmed after the consultation.