Effective date: 1 January 2026
These terms of service govern the relationship between the provider, Zung Sing Engineering Limited, and any person or company who reads this website, sends an enquiry or enters into an agreement for building services engineering, site inspection, supervision, maintenance or related works. By using the website or by proceeding past an enquiry, you agree to be bound by these terms as they apply to the matter in question.
If any requirement of these pages conflicts with the text of a signed agreement for a particular project, the signed agreement prevails for that project. These generic terms fill the gaps that a project agreement leaves open.
We advise that you read these terms in full before sending an enquiry or accepting a quotation, and that you keep a copy for reference. Nothing on this site is intended to override your statutory rights as a consumer where those rights cannot lawfully be excluded.
The engineering services, supervision and inspection activities described throughout this website are provided by Zung Sing Engineering Limited, an engineering firm carrying on business in building services. The website itself was developed and is operated by the developer and engineering practice under the same direction; the pages are published on behalf of the firm and are maintained from our Hong Kong base.
The full name of the contracting entity is Zung Sing Engineering Limited, and its principal and registered address is Rm 1818, 18/F, Lei Ye House, Lei Yue Mun Estate, Yau Tong, Hong Kong (HK). Enquiries directed to this entity, whether by website form, email, telephone or post, are handled by our engineering and support team.
References in these terms to us, our firm, the company or the engineering team all mean Zung Sing Engineering Limited and those engaged to act on our behalf under written authority.
You may browse this website freely for your information and may share its pages with others, provided you do not do so in a way that misrepresents our identity or our services. All text, graphics, arrangement and the distinctive scaffolding and riser presentation belonging to the site are protected as the property of the firm, and you agree not to copy or reuse substantial parts for a competing purpose without our written permission.
You agree not to use this website to post unlawful content, to try to break into our systems, to interfere with the service for other visitors or to collect data about visitors in an automated way without our agreement. Reasonable access is welcome; damaging or scraping the site is not.
While we keep the information on our pages as accurate as we reasonably can, buildings and regulations change. The website is a general introduction and should not be treated as the sole basis for a technical decision. We reserve the right to change the site at any time and accept no liability for temporary unavailability of a page.
When you send us an enquiry through the contact form, by email or by telephone, you begin a conversation, not a contract. Until both sides sign an order or otherwise accept a written quotation, no engineering works are agreed and neither party owes the other the duties of a signed project.
Sending a message does not of itself create any obligation on us to begin work, and the fact that we reply with advice does not make us the appointed engineers for a building. Formal appointment, where required, is recorded in writing and is usually confirmed only after we have reviewed drawings and visited the site.
We ask that you give accurate information in any enquiry, including the true condition of a site where you know it. Information that turns out to be wrong may affect a later quotation, and we are entitled to rely on the accuracy of what you provide.
Before work begins on any non-trivial commission we prepare a written scope describing the systems to be installed, inspected or maintained, the boundaries of the work and the deliverables such as test certificates and as-fitted records. This scope protects both parties by removing guesswork about what is included.
For higher risk activities we also issue a method statement setting out the sequence of works, the controls in place and the persons responsible. Our supervisors expect to work to such statements and to adjust them only with the agreement of all parties where site conditions demand.
A defined scope is a virtue in engineering. It lets us price honestly, lets you compare offers fairly and lets our site teams know when a task is finished. Where a task falls outside the written scope we treat it as a variation under the section below rather than silently folding it into the price.
Quotations we issue state either a fixed lump sum for a clearly defined scope or a rate basis where the quantity of work cannot be foreseen with confidence. Physical site obstacles, concealed conditions and the quality of existing plant can all make a fixed price unfair, so we explain the basis whenever we choose rates over a lump sum.
A quotation is valid for the period stated on it, which is usually thirty days. After that period we may revise the price if our quoted materials or labour costs have moved. We confirm the current price in writing before you accept it.
Prices are stated exclusive of any applicable sales, goods and services or value added tax unless the quotation says otherwise. Where a tax applies to the transaction, it is added at the rate in force on the invoice date. You are responsible for your own costs of financing, permits and any contribution to the works that falls outside our stated scope.
An order becomes binding when either you sign our written acceptance and return it, we sign your purchase order and return it, or we begin work with your clear agreement to the scope and price. Silence after an enquiry is not acceptance by either side.
All orders are subject to our being able to secure the plant, materials and skilled labour needed at the time required by the programme. If a material genuinely becomes unobtainable, we will tell you promptly and either propose an equivalent or agree a revised programme rather than quietly substituting a lesser product.
Until acceptance, either side may withdraw without penalty except where the other has already incurred clearly identified costs at the request of the party withdrawing. In such a case we invoice only the reasonable costs actually incurred.
To carry out our duties safely we need reasonable access to the areas of the building where the works sit, together with power for tools, a place to secure materials and the presence or cooperation of the person charged with operating the building. You agree to give us that access at the times agreed in the programme.
Our supervisors and installers are directed by our own named staff. Where a building manager issues a reasonable site rule, such as a rule about personal protective equipment, footwear or quiet hours, our people follow it, and we expect the same building to grant our own reasonable safety requirements equal respect.
If access is refused or a site becomes unsafe through no fault of ours, we will record the delay, suspend only the affected part of the works and discuss the impact on programme and price with you rather than walking off without notice.
A variation is any change that alters the written scope, the design, the quality of the materials or the extent of the works. We confirm every variation in writing before we carry it out, stating the change and its effect on price and time, and we ask you to approve that note so that there is no argument afterwards about what was agreed.
In an emergency where delay would risk safety or serious damage, we may act first and document the variation immediately afterwards. That is the only situation in which we carry out additional works without prior written agreement, and we will not use it as a reason to add charges a careful reader would never have expected.
Where our inspectors identify concealed defects that were not part of the original scope, we stop and report rather than automatically expanding the job. You then decide whether to instruct the rectification as a variation, and we price it fairly and separately.
We set out an indicative programme with our proposal and refine it with you at acceptance. The programme is an honest plan, not a guarantee that every external factor will behave. Delays caused by weather, other trades, late materials or changes to your brief are managed openly and advised to you as soon as we see them.
A reasonable programme is maintained through weekly coordination where the size of the job warrants it, and through a short progress note on smaller commissions. Our supervisors record progress so that responsibilities are visible to all parties.
Either side may suspend the works for a stated reason on written notice. During a suspension for which you are responsible, we are entitled to recover the standing cost of our allocated people and plant. During a suspension for which we are responsible, we bear that standing cost ourselves.
Every system we install is inspected and tested before it is offered for handover. Tests follow the relevant standard for that service, examples being continuity and insulation testing on electrical circuits, pressure testing on water and drainage piping, and functional testing on fire detection systems. Where a test needs to be witnessed, we make it easy for you or your consultant to attend.
We present the results of testing in a clear record and we complete the as-fitted documents and the certificates you will need for operation and for any statutory submission. These documents are an important product of our work and are always handed over with the finished system unless a project agreement says otherwise.
A system is considered handed over at the moment you accept the completion of the works and receive the associated records. From that point you take on the ordinary duties of a building operator, such as routine filter changes and visual checks unless those duties fall within a maintenance contract with us.
We warrant that our installed works will be free from defects in materials and workmanship for the period set out in the project agreement, which is commonly twelve months from handover or the statutory defect period where one applies. During that period we rectify, at our own cost, defects that our works cause.
Our warranty does not cover fair wear and tear, misuse, alteration by others, lack of routine maintenance or damage arising from events beyond our control. It also does not cover defects in components supplied by a manufacturer that keeps its own separate guarantee for those parts; we pass that manufacturer guarantee on to you in full and support you in claiming under it.
If you report a defect we will respond quickly, investigate the cause, and either repair or agree an appropriate remedy. We do not pretend that every fault is ours; where our investigation shows a fault lies outside our scope we will tell you plainly and offer to quote for the rectification.
Our invoices are due for payment within the period shown on the invoice, which for most commercial clients is thirty days from issue unless we agree otherwise in writing. For larger orders we may issue a payment schedule with an initial stage on acceptance, milestone stages and a final stage on handover.
Any overdue amount may be subject to interest from the due date at the rate permitted by law, and we may suspend further works under an existing agreement while a materially overdue account remains unpaid. We will always give you prior written notice before taking such a step on a live project.
Should a genuine dispute arise over part of an invoice, you are welcome to raise it with us, and we ask only that you pay the undisputed portion on time while we resolve the balance together. Disputed sums are not handed to a collection agency without a real attempt at a fair discussion first.
Drawings, method statements, tests, reports and design details that we prepare remain our intellectual property, but you receive a permanent licence to use them for the operation, maintenance, alteration and disposal of the building to which they relate. You may not repurpose them for an unrelated project without our written consent.
The as-fitted records and certificates we hand over are yours to keep and to share with your fire safety, electrical and maintenance duty holders. We retain our own working copies so that we can support you during the defect period and beyond.
Our website design, the scaffolding bay layout, the riser diagrams and the firm name are owned by us and protected under the applicable laws. We value the distinct way our pages present engineering works and ask that you do not imitate them to create a competing service.
Both parties are only as strong as their most careful work, and we set our liability honestly. Nothing in these terms excludes liability for death or personal injury caused by negligence, for fraud or for any other liability that the law does not permit us to exclude.
We are not liable, whether in contract, negligence or otherwise, for indirect or consequential loss such as loss of rent, loss of profit, loss of production or the cost of alternative accommodation, except to the extent such loss is not reasonably capable of exclusion by agreement.
Our total liability arising out of or in connection with a single commission is limited to the amount you paid us for that commission, or to the sum stated in the project agreement, whichever represents the agreed risk allocation between two businesses. You should insure your own consequential exposure to your building or tenants as you see fit.
We maintain insurance cover appropriate to our activities, including public liability cover for our on site works, and we will provide evidence of that cover on request before you sign. Employers compensation insurance applies to our own workers to the extent the law requires.
Safety is not an afterthought. Our teams work under risk assessments and wear the prescribed personal protective equipment, and our supervisors stop any activity that appears unsafe while the matter is resolved. We expect the same attitude from other trades sharing the site.
Where a project requires it, we cooperate with the principal contractor safety plan, attend the necessary inductions and briefings and keep our people informed of the specific hazards of the site, the same care we would expect for our own visitors.
You may end an agreement that has not yet begun by giving us written notice, in which case we charge only the reasonable costs already incurred at your request. Once work has started in earnest, termination is possible but is treated fairly so that neither side is left stranded.
We may suspend or end an agreement if you fail to pay a materially overdue invoice despite notice, if you prevent access without reasonable cause, or if continuing would require us to breach a legal or safety duty. We would raise the concern with you first and give you a reasonable chance to put it right.
On termination we stop work in a safe and tidy manner, hand over the records and completed portions of the works that belong to you, and settle accounts promptly. Payment for completed and tested works and for materials we have properly committed is due even where the full scope is not finished.
These terms and any project agreement made between us are governed by the laws of the Hong Kong Special Administrative Region, in keeping with the location of our registered business at Lei Yue Mun Estate, Yau Tong. The courts of that region have exclusive jurisdiction to settle any dispute unless the project agreement names a different procedure.
Before either side starts legal proceedings we encourage a prompt, calm attempt to resolve the matter. Most disagreements on a construction job are questions of fact, such as whether a fault falls inside the scope, and those are usually settled quickly once both sides look at the records together.
If a clause in these terms is held to be unenforceable, the rest of the terms remain in force, and the unenforceable clause is read down to the minimum extent needed to give it effect rather than striking down the whole document.
You may reach us at any time by writing to our support inbox or to our Hong Kong office. We are glad to answer a question about these terms before you commit to an order, and we usually respond the same working day.
Our postal and registered address is Zung Sing Engineering Limited, Rm 1818, 18/F, Lei Ye House, Lei Yue Mun Estate, Yau Tong, Hong Kong (HK). Our email address is support@zungsing.buzz and our telephone number is +12232652369.
Thank you for reading. These terms and our privacy policy describe how we work and how we look after you. To discuss a real project, return to our homepage and send us an enquiry; we look forward to working with you.