What will it really cost to build?
Indicative elemental cost estimates for early decisions, prepared the way a quantity surveyor does it and refined as completed Synergy projects are added. Pick a building type, adjust as many variables as you know, and the cost sheet updates live.
ZAR · Gauteng index 1.00
Synergy-calibrated
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How the estimate is built
Each building type carries a base rate per square metre of gross floor area for four quality levels. The rate is split into ten ASAQS-style elements, from substructure to mechanical services. Every choice you make adjusts the elements it affects, not the whole rate, so a steep site changes the substructure and a curtain-wall façade changes the windows and doors.
Site-specific items (boundary walls, paving, pools, solar, boreholes, lifts, service connections) are measured separately in metres, square metres or numbers and priced from a rate library. The total then adds preliminaries and general, contingency, escalation to the construction midpoint, professional fees, statutory costs and VAT.
Why it stays current
Synergy's proprietary rate library is calibrated on completed Synergy projects and independent published data, and is updated as new final accounts close. The rates and calculations run on Synergy's secure server; only your results are shown.
Accuracy
This is a concept-stage indicative estimate, comparable to an ASAQS elemental estimate prepared before drawings. The range reflects the current scope and design assumptions. It is indicative; measured performance is reported for supported project categories where validation evidence is available. It is not a quotation. Ground conditions, zoning, municipal bulk services and the tender market can move the price, so appoint a quantity surveyor before committing funds.
Published data we compare against
Every estimate is checked against independent published figures so you can see where it sits: published South African building cost standards (2025/26), Stats SA's building statistics (P5041.1), Property Review's provincial averages and the tiers quoted by other South African estimator websites. Published rates are escalated to today's rate basis using the BER building cost forecast and put on the same basis as Synergy's figure before comparing.
Install the app
Android phone: open the estimator in Chrome, tap the menu (⋮) and choose Install app or Add to Home screen.
iPhone or iPad: open it in Safari, tap the Share button and choose Add to Home Screen.
Windows or Mac: in Chrome or Edge, click the install icon at the right of the address bar, or use the Install app button at the top of this page. Windows users can also run the Synergy Cost Estimate installer.
Once installed, the estimator opens in its own window, keeps your inputs on this device. Calculating an estimate needs an internet connection, so you always get Synergy's latest rates.
Free building cost calculator for South Africa
Synergy Cost Estimate is a free online building cost calculator for South African projects. It gives an indicative elemental construction cost estimate for a new house, townhouses, apartments, a warehouse, retail, offices, medical buildings, hotels, schools or alterations – prepared the way a quantity surveyor does it, and backed by completed Synergy projects.
Frequently asked questions
How much does it cost to build a house in South Africa?
It depends on the size, specification, site and region. Synergy Cost Estimate works it out for your project: choose House, enter the floor area and quality, adjust what you know about the site and finishes, and you get an elemental breakdown and the whole project budget, including professional fees, approvals and VAT.
Is the building cost calculator free?
Yes. Register once with your name and email and you have full access to every building type, the cost breakdown, cash flow and the PDF report.
How accurate is the estimate?
It is an indicative concept-stage estimate for early decisions and budgeting, prepared the way a quantity surveyor prepares an elemental estimate and calibrated on completed Synergy projects. It is not a quotation; for a firm price you need a detailed cost plan or Bill of Quantities.
What does the estimate include?
Ten building elements from substructure to services, external works, preliminaries and general, contingency, escalation to the construction midpoint, professional fees, plan approval and connection fees, NHBRC enrolment for new homes and VAT, with a monthly cash flow and a downloadable PDF report.
Which building types and areas are covered?
Houses, townhouses, apartments, retirement villages, warehouses, retail centres, shop fit-outs, offices, office fit-outs, medical buildings, hotels and lodges, schools and alterations, anywhere in South Africa, with location factors for Nelson Mandela Bay, Kouga, the Garden Route, Cape Town, the Cape Winelands, Gauteng, Durban and other regions.
Who is behind Synergy Cost Estimate?
Synergy Quantity Surveyors & Project Managers, a quantity surveying and project management practice based in Gqeberha (Port Elizabeth). Contact qs@synergyps.co.za or visit www.synergyps.co.za.
© Synergy Quantity Surveyors & Project Managers · www.synergyps.co.za. List your business on Synergy Connect · Indicative planning estimate only, not a quotation. Rates exclude land, finance, furniture and loose equipment unless stated. Terms of Use. Calculations and rate data © Synergy; copying, scraping and reverse engineering are prohibited.