Privacy Policy

Homeowner privacy policy

Last updated: 30 October 2026

Who we are

Multiproject (SE) Ltd is responsible for the personal information we use to provide our homeowner budget calculator, Budget Reality Check, design cost checks and builder pricing packs. This notice explains what we use, why we use it and the choices you have.

You can contact our administration team at office@multiproject.uk or write to Ideas House, Station Estate, Eastwood Close, London E18 1RT. Our company number is 07523660.

The calculator and your choices

You can use the calculator and see your headline budget estimate without giving us your name or email address. The figure is calculated automatically from your answers and is an indication for early planning, rather than a survey, a builder’s quotation or a cost plan of your drawings.

If you would like more detail, you can join our free budget-planning email programme. It starts with your fuller budget report and continues with practical advice, useful materials and podcast episodes, and information and offers about our own cost-planning services. We tailor the emails to the project information you give us, including its stage and expected timing. We send initial follow-ups, then occasional emails as your project progresses; the timing varies with the programme and your project. You can unsubscribe at any time and keep the report you have received.

A request for a fee proposal or a booking is a separate choice. You do not have to subscribe to the email series or accept advertising cookies to request or buy a service.

What information we use

• Calculator answers and results, such as the work you are considering, approximate sizes, location, finish level, project stage and timing.
• Your email address if you request emails, a proposal or a service, and your name where you provide it. The calculator email signup does not require a phone number.
• Booking and project information, including your contact details, project location, questions, drawings, quotations, links and other documents you share with us. Required and optional fields are identified on the relevant form.
• Payment, invoice and booking records. Wix Payments handles online card payments; we do not receive your full card number.
• Correspondence, instructions, reports, call recordings, transcripts and notes relevant to your enquiry or project, including work prepared with AI assistance as explained below.
• Website and advertising information, including cookie choices, advertising click references and referral codes, as explained below and in our cookie notice.

We usually receive this information from you. We may also receive relevant project information from your architect, builder or another person working with you. If information needed to prepare a quotation or deliver a service is missing, we may need to ask for it before we can proceed.

Why we use your information

• To run the calculator and provide its requested results: our legitimate interests in providing a useful budgeting tool. Optional advertising measurement is treated separately below.
• To send and tailor the budget-planning emails you choose: your consent. Clicking the clearly labelled signup button is your choice to receive the ongoing programme of project advice, useful materials and information and offers about our own relevant services.
• To prepare a fee proposal you request and provide services you buy, including arranging appointments, reviewing your documents, taking payment and answering questions within the agreed service: steps you request before a contract and performance of our contract with you.
• To record and transcribe calls, use AI assistance and maintain a reliable professional project record: our legitimate interests in providing accurate and efficient advice, documenting instructions and advice, answering later questions and protecting our legal position.
• To handle relevant information about other people involved in a project: our legitimate interests and those of our clients in obtaining and providing professional cost advice.
• To send qualifying follow-up marketing after a genuine fee request or purchase: our legitimate interests in explaining our own similar services, subject to the email choices below.
• To keep accounting and tax records and meet other applicable legal requirements: our legal obligations.
• To measure advertising using Google Ads identifiers linked to enquiries or purchases: your consent.

Emails and unsubscribing

We send requested proposals and messages needed to arrange or provide your service regardless of whether you choose marketing emails. If you only use the calculator, we send marketing emails only when you actively sign up. Your subscription covers the ongoing budget-planning programme described above. We may adjust the advice and offers as your project progresses or you become a customer, while staying within the subscription you chose.

If you ask for a fee proposal or buy a service, we may also email you useful information about our own similar services where we collected your details directly in connection with that request or purchase, gave you a clear opportunity to refuse and you did not refuse. Every marketing email includes an unsubscribe option. We do not use a later enquiry or purchase to override an earlier objection. For subscribers and qualifying enquiries or customers, we use the project answers, stage and timing you give us to select relevant advice and offers. We do not use this permission to send other companies’ offers.

You can refuse these follow-ups on the fee request or booking form, use the unsubscribe link in a marketing email, or email office@multiproject.uk. You have an unconditional right to object to direct marketing, including the use of your information to select marketing for you. We stop marketing when you unsubscribe or object; necessary messages about an enquiry or service can continue. We keep a limited suppression record so that we respect your choice when you contact us again.

Understanding which adverts help

With your permission for advertising measurement, we use a reference from a Google ad click to understand which adverts lead to enquiries and paid work. We may keep the reference in your browser for up to 90 days and link it to your calculator signup, fee request or booking.

We share relevant conversion details with Google, including the advertising reference, the type and date of the enquiry or purchase and, where relevant, a transaction reference and purchase value. Some website conversions are sent when they happen; later sales may be reported subsequently. These uploads do not include your name or email address, but Google can link the reference to the original ad click.

We rely on your consent for this measurement, including the link to your enquiry and later sales. Your cookie choice is separate from your choice about emails. You can change it through the website’s cookie settings or contact office@multiproject.uk. To withdraw permission for measurement already linked to your enquiry, please contact us using the email address you gave us so that we can stop future use and uploads for that purpose. Withdrawal does not affect use that was lawful before you withdrew.

If you arrive through an architect’s link, its referral code may identify the referring practice. We use it to recognise the referral and provide the relevant website information. We do not tell the architect that you used the calculator, booked a call or bought a service, or share our advice with them, unless you ask us to.

Calls, recordings and transcripts

We normally record and transcribe our free introductory calls and Budget Reality Check calls using Google Meet. This helps us focus on the discussion, give accurate and efficient advice, preserve your instructions and the advice given, and answer later questions about what was discussed. We can use the record to help you review the discussion and clarify matters within the agreed service.

We tell you about recording when you book and remind you before it starts. If you would prefer an unrecorded call, tell us before the call or at its start and we will use notes instead. This does not prevent you from receiving the service.

Our basis is our legitimate interests in providing and documenting our professional services. Google processes recordings and transcripts for us under our Google Workspace business agreement. Access is restricted to authorised people working on your enquiry or project and relevant service providers. We do not publish recordings or use them in marketing.

AI assistance

We use AI-assisted business tools to help review relevant drawings, quotations and project information, organise notes and prepare reports. These include Gemini within Google Workspace and OpenAI through our report-writing application. We may also use Anthropic’s Claude and Grok through business workspaces or APIs for the same purposes. We use the information needed for the task, and a quantity surveyor checks AI-assisted work before it is used in our advice. Under their business-service arrangements, these tools do not use our content to train general-purpose AI models by default. We do not authorise customer project information to be used for that purpose. Providers may retain information for agreed service functions, security or legal requirements; we take this into account when choosing and configuring the services.

The calculator produces its indicative estimate automatically. We do not use it, or our AI assistance, to make solely automated decisions about you that have legal or similarly significant effects.

Information in project documents

Drawings, quotations and other project documents may contain details of architects, builders, consultants and other people involved in the project. We use relevant professional and project information to understand the documents, prepare our advice and maintain the project record. You do not need to obtain a separate consent form from every professional named in a drawing or quotation.

Please send documents you are entitled to share and avoid including unrelated private information. Where appropriate, please share this notice with people whose information you provide. We remain responsible for providing privacy information where the law requires it.

We normally need to understand design and access requirements, rather than medical histories. Please avoid sending unnecessary health information. If identifiable health information is needed for our advice, we will explain separately why it is needed and the legal basis for using it before proceeding.

Who receives your information

• Wix provides our website, calculator, forms, bookings, payments and emails, with Usercentrics for Wix helping manage cookie choices.
• Google provides our email, calendar, file storage, Google Meet and Gemini through Google Workspace. Google Analytics and Google Ads support website and advertising measurement subject to the relevant choices.
• OpenAI provides AI processing for our report-writing application.
• Anthropic (Claude) and the provider of Grok’s business/API services may also process relevant project information where we use those services, after checking the applicable service and data-protection arrangements.
• Render hosts our report-writing application and processes information needed to run it.
• Bitrix24 provides our customer-management system for fee requests, bookings and paid work. Calculator-only contact records are held in Wix rather than automatically added to Bitrix24.

Providers process information under their applicable service and data-processing terms. Some, such as payment and advertising providers, also have responsibilities for their own processing. We may disclose relevant information to professional advisers, insurers or authorities where necessary for advice, a claim or a legal requirement.

Processing outside the UK

Our providers may process information outside the UK. Wix uses Wix.com Ltd in Israel and other group companies and providers internationally. UK adequacy regulations cover Israel and countries in the European Economic Area.

Google may process information in the United States and other countries where it or its providers operate. Its business data-processing terms provide for applicable adequacy arrangements, including the UK Extension to the EU–US Data Privacy Framework, and approved contractual safeguards where required. OpenAI, Anthropic, the provider of Grok’s business/API services and our application-hosting providers may also process information outside the UK, including in the United States, subject to the applicable business-service and transfer arrangements.

Bitrix24 describes its regional hosting, support and other providers in its data-processing agreement and infrastructure and subprocessor information.

For transfers outside countries covered by UK adequacy, we require safeguards recognised under UK data protection law, such as an applicable UK Addendum or International Data Transfer Agreement, where required. You can ask office@multiproject.uk for information about the arrangements relevant to your information and copies of the applicable safeguards.

How long we keep information

If you do not buy a service, we normally delete identifiable calculator and enquiry records 12 months after the enquiry closes or your last substantive interaction with us. An active email subscription is treated separately: we keep your contact details, preferences and the limited project information needed to tailor the emails while we have valid permission and the programme remains relevant to you. We review relevance and whether the permission remains current, and remove information we no longer need. Sending an automated email does not by itself establish that an inactive subscription is still relevant. If you unsubscribe, we stop using your information for marketing and retain only what is needed for other explained purposes, including limited evidence of your choices and a suppression record.

If you buy a service, we normally keep the substantive project file for six years after we complete our services for that project. This includes relevant drawings, quotations, instructions, correspondence, reports, call recordings and transcripts. We keep these records to document the work and advice, answer later questions and establish, exercise or defend legal claims.

We may retain relevant records longer where necessary for an actual or reasonably anticipated dispute, an applicable longer claim period or a legal requirement. We review files and remove unnecessary duplicates and irrelevant personal information. A new unrelated project does not restart the retention period for every earlier file.

Accounting and tax records are normally kept for six years from the end of the financial year they relate to, or longer where the law requires. Advertising click references used for measurement are kept for up to 90 days from collection, then deleted or separated from identifiable customer records so they cannot be used to identify you.

We retain limited evidence of consent and marketing preferences for as long as necessary to demonstrate and respect your choices. Relevant AI-assisted outputs form part of the project record; unnecessary working copies and AI conversation histories are subject to our deletion arrangements. Where deletion from backups cannot take place immediately, the information is kept out of normal use until the backup is replaced.

Your rights and questions

You can ask for a copy of your personal information and for inaccuracies to be corrected. Depending on the circumstances, you can also request deletion, restrict its use or receive a portable copy. You can object to processing based on legitimate interests. Your right to stop direct marketing is unconditional.

Where we rely on consent, you can withdraw it at any time without affecting the lawfulness of earlier use. Contact office@multiproject.uk or use the relevant unsubscribe or cookie choice. We normally respond to rights requests within one month; where the law allows more time, we will explain why.

If you have a privacy complaint

Please email office@multiproject.uk or write to the address above, explaining what happened and the outcome you are looking for. We acknowledge complaints within two working days and aim to reply in full within ten working days. If we need longer, we explain why, give an expected response date and keep you informed. We investigate and explain the outcome without undue delay. Our Customer complaints policy describes the process in more detail.

You also have the right to complain to the UK’s data protection regulator, the Information Commission (ICO), at ico.org.uk/make-a-complaint/. Our ICO registration reference is ZA679421.