Double Building Materials Co.,Ltd
Privacy Policy
Last updated: 6 November 2026. It describes our current practice and is not legal advice.
This page explains what Double Building Materials Co.,Ltd collects when you visit doublebuilding.com, send us an inquiry, or answer one of our ads, and what we do with it. We do not sell your information.
Who we are
doublebuilding.com is run by Double Building Materials Co.,Ltd (“Double Building Materials”, “we”). We design and make custom staircases, railing systems and cabinetry in our own factory in Foshan, China.
Factory address:
Double Building Stairs Factory, Factory Building No. 3, Dalang New Industrial Zone, Lianhe Langxin Avenue, Luocun, Shishan Town, Nanhai District, Foshan, Guangdong, China.
What we collect
| Where it comes from | What we receive |
|---|---|
| Inquiry forms on this website (the contact page and the forms on product pages) | Your name, email address, phone or WhatsApp number, the product you are asking about, and your message. |
| Google Ads lead forms | Your name, email address, phone number, and your answer about whether you already have drawings (details below). |
| Email and WhatsApp | Whatever you choose to send, including drawings, sketches, measurements and site photos. |
| Your visit to the website | Cookies and similar identifiers, your IP address, browser and device type, and the pages you open (see “Cookies and tools on this website”). |
We do not ask for payment card numbers or passwords on this website. Please do not send them through a form.
How we use it
- Reply to your inquiry with material options, drawings, a quotation and next steps for your staircase, railing or cabinetry project.
- Prepare shop drawings, make, trial-assemble, pack and ship your order, and arrange installation if you ask for it.
- Keep an inquiry record so everyone working on your project follows the same conversation.
- Measure which ads and pages bring inquiries, and fix pages that are hard to use.
- Keep the website secure.
We do not sell a mailing list. We do not publish a price list. Every order is made to order.
Cookies and tools on this website
A cookie is a small file a website stores in your browser. These are the cookies and tools on doublebuilding.com:
| Name | What it does |
|---|---|
| PHPSESSID Set by this website | Keeps your session while you browse. It is deleted when you close the browser. |
| YP_ Set by this website | Remembers the site language. |
| YP_ Set by this website | Counts who is online. While it is active, the site also stores your IP address for about 30 minutes. |
| SITE_ Set by our web server | Counts visits. It can stay in your browser for up to about 8 years unless you delete it. |
| Google Ads tag Set by Google | Records when someone who clicked one of our ads sends an inquiry, so we can see which ads work. It may also let Google show our ads to people who visited this site. |
| Google Analytics Set by Google | Counts visits and the pages people open, so we can see which pages help. |
| Microsoft Clarity Set by Microsoft | Records how visitors click and scroll (heatmaps and session replays), so we can find and fix confusing pages. |
Google. Third-party vendors, including Google, use cookies to serve ads based on a visitor’s earlier visits to this website or other websites. Google’s advertising cookies let Google and its partners show ads based on those visits. You can turn off personalized ads in Google’s Ads Settings, and opt out of some other vendors’ cookies at aboutads.info. Google explains how it uses data from sites like ours in How Google uses information from sites or apps that use our services. To stop Google Analytics on your browser, use the Google Analytics opt-out add-on.
Microsoft Clarity. We use Microsoft Clarity to capture how you use and interact with our website through behavioral metrics, heatmaps and session replays. It uses first-party and third-party cookies and similar technologies. We use what it shows us to improve our pages and to keep the site secure. Microsoft explains how it collects and uses data in the Microsoft Privacy Statement.
Visitors in the EEA, the UK and Switzerland. For visits from these regions, the Google tags on this site start with ad and analytics cookies switched off, and Microsoft Clarity does not set its cookies unless consent is given.
You can also block or delete cookies in your browser settings.
Who we share it with
- Our sales, design and project team in China, who answer your inquiry.
- A freight forwarder, only for shipping your order.
- Our installation crews or partner installers in the USA, Australia and Canada, or the installer you appoint, only for your project.
- Google and Microsoft, as the tools above describe.
- Authorities, when the law requires it.
We do not sell your personal information, and we do not sell leads to other advertisers.
Google Ads lead forms
Some of our search ads include a Google Ads lead form (for example a form titled Request a Drawing Review). Google shows the form, collects the answers and then sends the lead to us. The form collects only these fields:
| Field | Why we ask |
|---|---|
| Name | So we know who to reply to. |
| Email address | So we can reply, and so you can send drawings after the form (the form itself cannot attach files). |
| Phone number | So we can call or message you, including on WhatsApp, about the same project. There is no separate WhatsApp field on the Google form. |
| “Do you have drawings for this project?” | A single choice: architect or shop drawings / a sketch with dimensions / not yet, still exploring. We use it to know whether we can start a drawing review. |
We do not ask for street address, city, state, postcode, company name or job title on this form.
Google stores the lead in our Google Ads account and can send us an email copy at admin@doublebuilding.com. Google states that advertisers can download recent leads as a CSV for a limited window, and that Google keeps lead-form data for a limited time (Google’s current help text: download about the last 30 days; storage about 60 days). After that, we rely on the copy in our own inbox and inquiry record. Google’s own processing is described in Google’s Privacy Policy and in About lead form assets.
Drawings and other files
If you email plans, sketches, dimensions or photos to admin@doublebuilding.com, or send them on WhatsApp, we treat them as project material for the same inquiry: shop-drawing review, fabrication, packing and shipment. We do not post customer drawings as public marketing unless you have agreed to that separately.
How long we keep it
We keep an inquiry while we are answering it and, if the project goes ahead, while we are drawing, making, packing, shipping and supporting the order. We do not publish a single deletion date for every inquiry, because an active project file is not the same as an unanswered message. If you want an inquiry deleted from our mailbox and inquiry record, email us and say so.
Google and Microsoft keep the data their tools collect under their own retention rules.
Where the data goes
You may be in the United States, Australia, Canada or elsewhere. Our team reads inquiries in China, and Google and Microsoft may process data in other countries. That is an international transfer. We do it because the team that reviews drawings and makes your order is in China.
Your choices
Email admin@doublebuilding.com to ask what we hold about you, to correct a name or number, to ask us to delete your inquiry, or to ask us to stop following up. If you live in a US state with a privacy law, such as California, you can make these requests too. We will not treat you differently for asking.
For ads and analytics, use the Google, Microsoft and browser controls listed in “Cookies and tools on this website”.
Children
This website and our ads are for people planning a staircase, railing or cabinetry project — typically a property owner or their builder. We do not aim them at children, and we do not knowingly collect a child’s information.
Changes
If we change what we collect or the tools on this site, we will update this page and the date at the top.
Contact
Double Building Materials Co.,Ltd
Email: admin@doublebuilding.com
Phone / WhatsApp: +86 185 8907 5949
Factory: Double Building Stairs Factory, Factory Building No. 3, Dalang New Industrial Zone, Lianhe Langxin Avenue, Luocun, Shishan Town, Nanhai District, Foshan, Guangdong, China.