Support
This page describes how we operate the service. It is not legal advice about the quotes you send your customers.
RenderSim is a quote desk for UK firms that do External render and Internal plastering. This page is how to use it, what it will and will not do, and how to reach us.
Email support@rendersim.co.uk. That is the support inbox for this app. Company details are on About. Quote emails the app sends on your behalf come from hello@rendersim.co.uk.
How to sign in
Open Sign in, enter the email for your firm, and type the 6-digit code we send. There is no password to remember, and we do not store one. The same code creates the account on first use. The same email is the account on any phone: quotes, customers, rates and company details come back when you sign in. Photos of the look, when that job has one, come back too. If the email only contains a link, tap it, or paste the whole link into the code box. Check junk if it is slow.
How quotes work
Set your rates (or start from the market estimates and change them). Add your company name, address, phone, email, logo and brand colour in Settings. A new quote starts with the customer, the site and the tape. A photo of the look is only for External render. Prices come from the rates you entered. You remain responsible for checking every quote before it goes out. There are no payments in the app: the customer pays you.
The picture on the quote
The visualiser is only for External render. The visualiser puts a colour sample on the customer's own photograph, keeping that photograph's light and shade. It is not a photograph of finished work. After a photo lands we look for the house, then the doors and windows on it. If we find them, drag a corner that is off; if we cannot, add them yourself. We never draw an opening we did not see. The result is an illustration, not a survey. It is a look, not a survey. It does not invent cracks, damp or substrate (the surface being covered). It is not a specification, not a guarantee of finished work, and not a photoreal reconstruction of the building. Show it as a look at the finish, not as a measured survey.
Customer links
You can send a customer a link to a frozen copy of a sent quote (the breakdown, your terms, and a colour sample when the job includes one). There is one live link per quote. It stays open for at least 60 days, plus a short grace period after the quote's valid-until date, and never longer than 400 days. You can revoke it at any time. A replacement link shows the same saved paper. Issued quotes stay as they were; a change of scope is a new numbered revision. Only a sent quote can be accepted. If they tap Accept, the name they type, the time and their connection's address are stored with the quote as evidence of that tap. It is not a certified electronic identity check.
Download or delete your data
Signed in, open Settings. Your data downloads a JSON file of your profile, rate card, customers and quotes, or a CSV of the quotes alone. Delete account removes the account and the data we hold for it. Share links then stop working.
Questions
Put this on the Home Screen.
On Android, open the browser menu and tap Install app or Add to Home screen. On iPhone, open this site in Safari, tap Share, then Add to Home Screen. The icon opens on your dashboard. Quotes, customers and rates live in the account, not on the phone. Photos of the look, when that job has one, live there too.
I got a new phone / lost my old one.
Sign in with the same email. Your quotes, customers, rates and company details live in the account, not on the phone. Photos of the look, when that job has one, live there too. Then open Settings and tap Sign out of other devices so the old phone cannot stay signed in. A quote you had started but not saved stays only on the device you typed it on.
The code never arrives.
Wait a minute and check junk. Ask for a fresh code from the sign-in page. The newest email is the one that works. Codes are short-lived. If nothing comes after a second try, write to us from the same address you typed.
Can the customer pay in the app?
No. RenderSim prepares and presents the quote. Payment is between you and your customer.
Is the picture a survey?
No. It is an illustration on the customer's photo. It is a look, not a survey. It does not invent cracks, damp or substrate (the surface being covered). We try to find the house, then the doors and windows on it; if we cannot, you add them. The Service does not measure the building for you. A photo of the look is only for External render.
Someone forwarded a quote link.
Anyone with the address can open a live link. Revoke it from the quote if it should no longer be seen, and send a new one if you still want them to have it. The new link shows the same saved paper.
Reach us
Email support@rendersim.co.uk. Company details, privacy and terms are on About and Contact.
Last updated: 15 September 2026.