Why Do Pool Quotes Differ So Much? The Choices That Change Your Budget

On soft ground, excavating a 5x10 pool takes one working day; the same size on rocky ground stretches over days with a breaker, and the volume of spoil to be hauled away grows. The dig goes 30 to 40 cm deeper than the pool itself, because a blinding concrete layer and a drainage layer go underneath.

The second uncertainty is groundwater. If water seeps into the pit, the pool shell takes pressure from outside. In that case you need a drainage line, a sump and a buoyancy (uplift) calculation, and the shell's thickness and reinforcement increase. An empty pool being shifted by groundwater is a real occurrence, seen in pools drained for the winter.

The third is access. If an excavator cannot get into the garden, the dig is done with a mini machine or by hand, which multiplies labour time several times over. If there is nowhere to set up a concrete pump, the concrete is moved by wheelbarrow. In the city, on narrow streets and at homes with finished gardens, the item that inflates the budget most is often not the pool itself but getting to it.

That is why wall thickness, rebar diameter and spacing are set by structural calculation. Using watertight concrete and pouring without interruption gives an advantage that no waterproofing applied later can make up for.

Cutting corners on waterproofing is paid for two or three seasons later. The difference between brush-on membrane, cement-based crystalline waterproofing and polyurethane systems looks small on the first invoice; once a leak starts, the pool finish has to be stripped, and then the difference becomes large. Calling in a leak detection team costs more than getting the waterproofing right from the start.

The deeper the pool, the thicker the shell. There is a difference in concrete and steel between a pool with a constant depth of 1.50 m and one that slopes from 1.20 to 1.80 m; in a diving pool that goes down to 3 m, the difference grows considerably. Depth is not only a comfort decision but a budget decision.

Liner (PVC membrane) sits at the economical end and goes in quickly; its lifespan is limited and it is replaced over the years. Ceramic and porcelain tiles sit in the middle band and offer a wide choice of colours. Glass mosaic sits at the top end and noticeably changes the colour of the water.

The difference is not only in the material but in the labour. Laying glass mosaic takes many times longer per square metre and needs an experienced installer; the grout and render substrate has to be accurate to the millimetre. So choosing mosaic pushes the budget up on two fronts at once.

When deciding, think about how the water will look. Light blue mosaic makes the pool look turquoise, while a dark grey or black finish turns the pool into a mirror and warms the water faster. Your colour choice affects your heating budget too; nobody mentions it, but it does.

It needs no extra tank, the plant room stays small and the pipe runs are short. That is why it is the most common choice for residential pools.

In an overflow system the water is level with the coping, spills into a grating on all four sides and collects in a balance tank. This system adds the following: a balance tank of 60 to 80 litres for every square metre of pool surface, an overflow channel and grating along the perimeter, level control automation, longer pipe runs and a larger pump. All five of these items add to the budget.

What do you get in return? An unbroken waterline and a surface that cleans itself. In hotels, villas and projects with a view, the difference is worth paying. For a homeowner who will swim with the family in the back garden, a skimmer system is enough; don't let anyone tell you otherwise.

Work out the pool volume, divide it by the 6-hour turnover time targeted for residential pools, and you have the hourly flow rate. A 5x10 pool with an average depth of 1.50 m holds 75 m³; a 6-hour turnover means a pump of 12 to 13 m³/h.

The filter is chosen for that flow rate. For 12 m³/h, a sand filter with a Ø600 mm vessel is the typical solution. When glass media is used instead of sand, filtration becomes finer and backwash water decreases; the initial outlay is a little higher and it pays back in operation. The pipe diameter follows from this as well: Ø50 is borderline, Ø63 runs comfortably.

If a quote does not state the pump power and filter diameter, it is incomplete. An undersized filter makes the pool cloudy, and an oversized pump burns electricity. The quickest way to see where the gap between two companies' quotes comes from is to compare these two numbers.

On the installation side, there is a serious difference between a heat pump, solar collectors and a boiler connection. On the operating side, the difference repeats every month throughout the year; that is why you need to look at seasonal consumption, not the initial price.

Most heat loss happens through evaporation from the water surface. So what determines the heating load is not the pool's volume but its surface area. A pool with a 50 m² surface needs a noticeably more powerful unit than one with a 32 m² surface.

A pool cover is the investment with the highest return in this item. A pool covered overnight loses far less heat by morning, and the heat pump does not have to go up a model. If you are having heating installed, get the cover included in the same quote; a cover bought later costs more and tends not to fit properly.

This pool needs two skimmers, a 12 to 13 m³/h pump, a Ø600 sand filter and a mid-range heat pump. It is the most balanced size for residential pools; all the equipment comes from standard production ranges and no custom manufacturing is needed.

8x4 m, 1.50 m deep: 32 m² of surface, 48 m³ of water. The water volume drops by a third, and the heating load and chemical consumption fall in step. The 8-metre length allows short-distance swimming; whether this size suits you depends on how you expect to swim.

The budget difference between the two sizes is not linear. Excavation, formwork, the plant room and design fees exist in much the same way for both pools; only the items proportional to concrete, finish and water volume get smaller. In other words, making the pool smaller does not make the budget smaller by the same ratio; decide with that in mind.

10 × 5 m concrete pool costs 1,850,000 TL in October 2026 (excluding VAT). This price rests on a calculation that scales with size: the reference pool is 1.5 m deep, with a 95 m² shell area and 75 m³ of water. The shell area is the floor area plus the perimeter multiplied by the depth; structural and finishing work grow with that area, the mechanical installation with the water volume. Ground conditions, lining type and access are added at the site survey.

Surrounding paving and decking: the 1.20 to 2.50 m strip around the pool adds up to a lot of square metres, and if natural stone is chosen it rivals the pool finish in cost. Landscaping and lighting: the garden needs repairing after the dig.

The electrical infrastructure is a separate item. The plant room needs its own circuit, residual current protection and earthing, and pool lighting requires a safety extra-low voltage transformer. Whether the existing household distribution board can handle this is checked during the site survey.

Permit and design fees and the water for the first fill are also part of the budget. 75 m³ of water is supplied from the mains or by tanker, depending on where you are; it is a one-off but real item. If the quote does not mention these three, ask, so they do not surface later.

Check whether all of these eight lines are written down: shell thickness and reinforcement, waterproofing system and brand, type of finish, circulation type, pump flow rate, filter diameter, heating unit capacity, and warranty period and coverage.

A quote with all eight lines written out may come in higher than one without them. It usually does. An incomplete quote looks cheap because its gaps are filled later with extra payments; plenty of customers who have been through this come to us.

You can use our calculator for a scope list and quote prepared for your pool's size. It shows which items come into play based on the size and preferences you enter, and you can continue from the same form for a firm quote after the site survey.