Safety Signs

Please Knock Before Entering Sign

SKU IB-SAF-239 ISO 7010 M001
From £4.01· UK delivery £7.95, free over £99

A Please Knock Before Entering sign guides drivers and visitors to the right entrance or exit. Choose 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl in sizes from 200 × 50 mm to 297 × 100 mm; the largest reads at about 4 metres.

Turnaround
…Working out your price

Price is final. No VAT added. UK delivery £7.95, free over £99. Scottish Highlands +£10; islands and NI quoted.

Artwork

Design fees are fixed, shown as their own line in your basket, and cover the whole quantity of this item. You can also upload later: we email you after you order.

UK mainland delivery £7.95, free on orders over £99. Remote areas are quoted.

  • Every file checked before print
  • Final price, no VAT added
  • Secure card payment by Stripe
  • Printed in Manchester

Overview

The short answer, then the detail.

A Please Knock Before Entering sign guides drivers and visitors to the right entrance or exit. Choose 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl in sizes from 200 × 50 mm to 297 × 100 mm; the largest reads at about 4 metres. UK mainland delivery £7.95, free over £99; no VAT added.

This Please Knock Before Entering sign guides drivers and visitors to the right entrance or exit. It is typically used in car parks, business parks, hospitals and depots. The design uses a blue mandatory circle with a clear instruction.

The instruction "Please Knock Before Entering" is short enough to read in passing, which is what a mandatory sign needs.

The legal background: mandatory signs follow the format set by the Health and Safety (Safety Signs and Signals) Regulations 1996: a white symbol or instruction on a blue circle, telling people what they must do.

Please Knock Before Entering Sign: sizes and materials

Materials: 3mm Foamex (rigid PVC foam board), light and easy to fix indoors or for short-term outdoor use, 3mm Dibond aluminium composite, rigid and weatherproof for long-term outdoor use and self-adhesive vinyl for smooth walls, doors, glass and equipment. Indoors, Foamex or vinyl is usually all you need.

How far away will people be? As a guide we allow about 1 metre of viewing distance for every 25mm of sign height, based on the distance-factor method in ISO 3864-1: 200 × 50 mm (reads at about 2 m); 250 × 75 mm (reads at about 3 m); 297 × 100 mm (reads at about 4 m).

Where to put it: At junctions and entrances, readable from a moving vehicle.

Artwork, file check and delivery

Every order for a please knock before entering sign gets a free file check by a person before anything is made. We print and finish every sign in our Manchester workshop. UK mainland delivery is £7.95 per order, free on orders of £99 and over; see delivery for timings and areas. We are not VAT registered, so no VAT is added to the price shown.

More like this: mandatory signs, or the full safety signs range. Not sure which to choose? Read our guide to safety sign colours.

Prices by size

Popular sizes, smallest first.

Size3mm Foamex3mm Dibond aluminium compositeself-adhesive vinyl
200 × 50 mm
250 × 75 mm
297 × 100 mm

Final prices per item with the lowest-priced options. UK delivery £7.95, free on orders over £99. Choose a price to load it into the price calculator.

Specifications

Materials, sizes and finishing for this product.

ISO 7010 referenceM001 (General mandatory action sign)
MessagePlease Knock Before Entering
Sign typeMandatory
Materials3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl
Sizes200 × 50 mm, 250 × 75 mm, 297 × 100 mm
Viewing distance200 x 50: 2 m, 250 x 75: 3 m, 297 x 100: 4 m
PrintFull colour, single sided
Made byPrinted in our Manchester workshop
SKUIB-SAF-239
PriceFinal price shown in the configurator. No VAT is added.
DeliveryUK mainland £7.95 per order, free on orders of £99 and over. Scottish Highlands +£10; islands and NI quoted.
Artwork checkFree file check on uploaded artwork (resolution, size and bleed).

Which size do I need?

A safety sign must be large enough to read from where people will see it. Our conservative guide, based on the distance-factor method in ISO 3864-1, is about 1 metre of viewing distance for every 25 mm of sign height (the shorter side). Use it with your own risk assessment.

SizeReadable from up to about
200 × 50 mm2 m
250 × 75 mm3 m
297 × 100 mm4 m

Well lit or internally lit signs can be read from further away; dim areas need larger signs.

Who makes it

Printed in our Manchester workshop

InstantBanners is a sign and print shop in Manchester. We check your file will print well, then print and finish this item in our Manchester workshop.

  1. 01Your artworkUpload your print-ready file, or choose one of our paid design services.
  2. 02File checkA person checks uploaded files for size, bleed and resolution.
  3. 03Made to orderPrinted and finished in our Manchester workshop, then sent to you.

Frequently asked questions

About please knock before entering sign.

What size Please Knock Before Entering sign do I need?

Work back from the viewing distance: about 2 m for 200 × 50 mm, about 3 m for 250 × 75 mm, about 4 m for 297 × 100 mm. In poor light or where people are moving fast, go a size up.

Is there an ISO 7010 symbol for "Please Knock Before Entering"?

No ISO 7010 symbol covers this exact message, so the sign pairs the text with the ISO 7010 M001 general mandatory action sign.

Where should the Please Knock Before Entering sign go?

At junctions and entrances, readable from a moving vehicle. Keep it clear of anything that could block the view.

Is a Please Knock Before Entering sign a legal requirement?

Mandatory signs follow the format set by the Health and Safety (Safety Signs and Signals) Regulations 1996: a white symbol or instruction on a blue circle, telling people what they must do. Your own risk assessment decides where signs are needed.

Can I put the Please Knock Before Entering sign outside?

Yes, in Dibond. Foamex is best kept indoors or in sheltered spots.

What does the colour of the sign mean?

A blue circle means an action that must be taken. This sign follows that layout.

Is VAT added to the price?

No. We are not VAT registered, so no VAT is added to the price shown. UK mainland delivery is £7.95 per order, free on orders of £99 and over.

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What customers say about our Manchester print shop on Google

5.0Google rating
Rebecca W.

Great service, nice quick communication via WhatsApp, easy transaction thank you!

Google review of our Manchester print shop
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Great service and quick respond

Google review of our Manchester print shop
Basheus K.

Great service, value for money and does what he says. Hes a good man Imran.

Google review of our Manchester print shop

These are Google reviews of our Manchester print shop, not reviews of individual products, as shown on Google on 27 September 2026. Read all reviews on Google.

Questions

Buyer questions about this product, answered. Can't see yours? Ask below and our team will reply.

What sizes does the Please Knock Before Entering Sign come in?

The Please Knock Before Entering Sign comes in 3 listed sizes, from 200 × 50 mm at £4.01 up to 297 × 100 mm at £4.49. In between: 250 × 75 mm. Prices are the lowest option for each size.

Which material should I choose for the Please Knock Before Entering Sign?

It depends where it goes and for how long: 3mm Dibond aluminium composite is rigid and weatherproof, the one for long-term outdoor use and busy areas. 3mm Foamex is light and smooth, best indoors or in sheltered spots. Self-adhesive vinyl sticks flat to doors, glass and smooth walls.

What artwork options are there for the Please Knock Before Entering Sign?

The Artwork choice on this page offers: "I will upload print-ready artwork" (free), "Add my text and logo to a clean layout (typesetting)" (£15), "Design it for me from my brief" (£35), "Redraw or vectorise my logo from a low-res file" (£50) and "Design a new logo for me" (£100). Design fees are fixed, show as their own line in the basket and cover the whole quantity of that item. Typesetting includes 1 proof and 2 rounds of changes; design from your brief includes 1 design and 2 rounds of changes. The Please Knock Before Entering Sign is printed on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl.

What is the cheapest price for the Please Knock Before Entering Sign?

The lowest price is £4.01, which is what the calculator opens on: size 200 × 50 mm and material self-adhesive vinyl. Every other combination is priced as you choose it, including faster turnaround, and that price is final because we do not add VAT. UK mainland delivery is £7.95 per order and free when your goods total is £99 or more after any discount code (artwork and design fees do not count towards it).

How quickly can I get the Please Knock Before Entering Sign?

Saver is ready to dispatch in 6 working days, Standard in 4 and Express in 2, counted in working days (Monday to Friday, not bank holidays) from when your order and artwork are confirmed. The exact figure for your chosen size and options shows beside each turnaround in the calculator. Courier delivery usually takes 1 to 3 working days after dispatch, and we email the tracking details when the parcel leaves us. On the opening option, the Please Knock Before Entering Sign is ready to dispatch in 6 working days on Saver or 2 on Express.

How much is delivery for the Please Knock Before Entering Sign?

UK mainland delivery is £7.95 per order and free when your goods total is £99 or more after any discount code (artwork and design fees do not count towards it), so one sign at £4.01 on its own pays £7.95, and the charge disappears once your basket reaches £99. Mainland Scottish Highlands postcodes add £10 once per order. Northern Ireland, the Scottish islands, the Isle of Man, the Channel Islands, the Isles of Scilly and the Isle of Wight are quoted before you order.

How thick is the Please Knock Before Entering Sign?

The board options are 3mm Foamex and 3mm Dibond aluminium composite, so the board version is 3 mm thick. The self-adhesive vinyl version is a thin film that sits flat on the surface. Dibond is two thin aluminium skins with a plastic core, so it is rigid but still easy to fix. Foamex is a light foamed PVC board.

Can I get the Please Knock Before Entering Sign as a sticker?

Yes. Choose self-adhesive vinyl in the material options and the sign arrives as a sticker to peel and apply. It suits doors, glass, machines, cupboards and smooth painted walls, where a board would be awkward to fix. Clean and dry the surface first and smooth it on from the middle outwards. For rough or dusty surfaces, choose a board instead.

Will the Please Knock Before Entering Sign show up at night?

Only where there is light on it. We print on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl, which are not reflective or glow in the dark. For car parks, yards and routes used after dark, position signs under existing lighting, or light them. Where your risk assessment calls for reflective or photoluminescent signs, you will need a specialist supplier.

How do I fix the Please Knock Before Entering Sign to a wall or fence?

Foamex and Dibond boards can be screwed to a wall through holes drilled near the corners; use washers and do not overtighten, especially on Foamex. On smooth indoor walls and doors, double-sided foam tape or adhesive pads avoid drilling. On fences, drill the board and cable tie it through the holes. The vinyl version simply peels and sticks to a clean, dry, smooth surface. The Please Knock Before Entering Sign is printed on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl.

What happens if my file is not good enough to print?

Our file check catches the usual problems: the wrong size, no bleed, low resolution images and text too close to the edge. We tell you what needs fixing before anything is printed, and you can send a new file. If you would rather we sort it, the typesetting option (£15, 1 proof and 2 rounds of changes) sets your text and logo on a clean layout. The Please Knock Before Entering Sign comes in 3 listed sizes, from 200 × 50 mm to 297 × 100 mm.

Do you check my file before printing?

Yes. A person from our team checks every uploaded file for size, bleed and resolution, and tells you if something needs fixing before anything is made. We print what you supply, so check spelling, phone numbers and dates yourself too. Production starts once your order and artwork are confirmed. The Please Knock Before Entering Sign is printed on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl.

Can my designer send the file straight to you?

Yes. You can upload your file on the product page, or place the order and upload later: we email you after you order. Your designer can send the file to us by email or WhatsApp with your order number, so it does not have to come through you. The turnaround clock starts once your order and artwork are confirmed, so send the file early if you have a deadline. The Please Knock Before Entering Sign is printed on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl.

Can I change the wording or add my logo to the Please Knock Before Entering Sign?

Yes. Choose "Add my text and logo to a clean layout" (£15, 1 proof and 2 rounds of changes) or "Design it for me from my brief" (£35) in the Artwork options and tell us what you need. You can also upload your own print-ready file at no charge, and a person checks it before printing. Keep safety symbols and colours as they are: changing them can make the sign harder to understand. The Please Knock Before Entering Sign comes in 3 listed sizes, from 200 × 50 mm to 297 × 100 mm.

What resolution does my artwork need for this sign?

For items read close up, aim for 300 dpi at the finished size. At 300 dpi a 297 × 100 mm design needs about 3,508 × 1,181 pixels. Logos and text are best as vector artwork, which stays sharp at any size. Photos taken from websites or social media are usually far too small; our file check flags images that may print soft.

Which file types do you accept for the Please Knock Before Entering Sign?

A PDF at the finished size is best, with fonts embedded or converted to outlines. We also take AI, EPS and SVG, and high resolution JPG, PNG or TIFF files. Word, PowerPoint and Canva files are fine as a starting point, but export a full-quality PDF if you can. You can upload up to 3 files of 25 MB each on the product page, or upload later: we email you after you order. For the Please Knock Before Entering Sign, set your file up at the size you order, for example 200 × 50 mm.

Will the price change at checkout?

Only delivery is added. The goods price you see in the calculator is final, with no VAT added. UK mainland delivery is £7.95 per order and free when your goods total is £99 or more after any discount code (artwork and design fees do not count towards it). Any artwork or design fee you choose shows as its own line in the basket, so you can see exactly what you are paying for. The Please Knock Before Entering Sign is printed in our Manchester workshop.

How do I order several of this sign?

The price shown is for one sign in the size and material you pick. Set the quantity box next to Add to basket and the basket multiplies it. If you need several different sizes or materials, add each one to the basket separately. One artwork fee covers the whole quantity of a line, and "Same artwork as another item in my basket" adds no second fee. For large runs, ask for a quote. The Please Knock Before Entering Sign comes in 3 listed sizes, from 200 × 50 mm to 297 × 100 mm.

I have a deadline. Is there a faster option for this sign?

Yes. Express makes this sign ready to dispatch in 2 working days on the opening option, priced at £5.33 against £4.01 on Saver (6 days). To plan back from a date, add 1 to 3 working days for the courier after dispatch and allow for artwork: production starts once your order and artwork are confirmed. If the date is very tight, call 0161 315 1151 before you order.

Can you deliver to Northern Ireland, the Highlands or the islands?

Yes, with a difference in price. Mainland Scottish Highlands postcodes, for example around Inverness, Fort William, Oban and Thurso, pay the mainland rate plus £10 once per order, even when the order qualifies for free delivery. Northern Ireland, the Scottish islands, the Isle of Man, the Channel Islands, the Isles of Scilly and the Isle of Wight are quoted before you order: use Get a quote or call 0161 315 1151. We do not deliver outside the UK. The Please Knock Before Entering Sign starts at £4.01 before delivery.

Please Knock Before Entering Sign or Please Turn Off the Light When You Leave Sign: which should I choose?

The Please Knock Before Entering Sign has 3 listed sizes from 200 × 50 mm; Please Turn Off the Light When You Leave Sign has 4 from A4 (210 × 297 mm). Prices start at £4.01 and £5.28 respectively. Pick the one whose size and material fit where it will go; both pages show live prices for every option.

Please Knock Before Entering Sign or Please Ring for Attention Sign: which should I choose?

The Please Knock Before Entering Sign has 3 listed sizes from 200 × 50 mm; Please Ring for Attention Sign has 4 from A4 (210 × 297 mm). Prices start at £4.01 and £5.28 respectively. Pick the one whose size and material fit where it will go; both pages show live prices for every option.

How do the material prices compare on the Please Knock Before Entering Sign?

At 200 × 50 mm: 3mm Foamex £24.79, 3mm Dibond aluminium composite £36.94 and self-adhesive vinyl £4.01. The gap stays similar on bigger sizes, which the Prices by size table on this page shows in full. Choose on where the sign goes rather than price alone: the cheapest material is not always the one that lasts in that spot.

Please Knock Before Entering Sign or Wear Safety Helmet Sign: which should I choose?

The Please Knock Before Entering Sign has 3 listed sizes from 200 × 50 mm; Wear Safety Helmet Sign has 4 from A4 (210 × 297 mm). Prices start at £4.01 and £5.28 respectively. Pick the one whose size and material fit where it will go; both pages show live prices for every option.

What other signs go with the Please Knock Before Entering Sign?

Signs that are often needed alongside it include Please Ring for Attention Sign, Please Turn Off the Light When You Leave Sign, Wear Safety Helmet Sign and Keep to Walkways Sign. Each has its own page with sizes, materials and live prices, and ordering them in the same material keeps a set looking consistent. Add them to one basket: delivery is charged once, and it is free once the goods total reaches £99. The Please Knock Before Entering Sign is printed on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl.

Can I get the Please Knock Before Entering Sign bigger than 297 × 100 mm?

The largest listed size is 297 × 100 mm, from £4.49. For a bigger sign, use Get a quote with the size, material and quantity, and we will price it. Boards larger than A0 travel as oversize items, which adds £15 once per order.

Is the Please Knock Before Entering Sign portrait or landscape?

This design is landscape, in 200 × 50 mm, 250 × 75 mm and 297 × 100 mm. Landscape suits wide spaces such as fences, above doors and along corridors. If you need the other way round, choose a design option and we will lay it out for you.

Will this sign bend or bow in the sun?

Foamex is a foamed plastic, so in strong sun and heat a large, thin board can bow, especially if it is only fixed at the corners. Dibond has aluminium skins and stays flat, which is why it is the choice for long-term outdoor signs. Fixing Foamex flat against a wall, or choosing a thicker board, keeps it straighter. The Please Knock Before Entering Sign is printed on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl.

Can I trim or drill this sign myself?

Foamex and Correx cut with a sharp craft knife and a straight edge: score a few times, then snap or cut through. Dibond has aluminium skins, so it needs a fine-toothed saw and a steady hand. Drill fixing holes with an ordinary drill bit, going slowly, and keep holes at least 10 mm from the edge. Cutting into the print loses the bleed, so allow for it in the design. The Please Knock Before Entering Sign is printed on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl.

Should my artwork be CMYK or RGB?

Supply CMYK where you can. RGB files are converted to CMYK for print, which can make very bright greens, blues and oranges look slightly duller. If you need a brand colour matched, give us the Pantone reference and we match it as closely as the material allows. Small differences between a screen and the printed item are normal, because screens give off light and print reflects it. For the Please Knock Before Entering Sign, set your file up at the size you order, for example 200 × 50 mm.

Can I have the Please Knock Before Entering Sign in another language, or in two languages?

Yes. Choose "Add my text and logo to a clean layout (typesetting)" (£15) and send the wording in each language; you get 1 proof and 2 rounds of changes. Keep the symbol and the sign colours the same so the meaning stays clear to everyone. Please send the translation yourself: we lay out the text you give us, we do not translate. For the Please Knock Before Entering Sign, set your file up at the size you order, for example 200 × 50 mm.

Will this sign be easy to read for people with poor sight?

Strong contrast, a plain bold typeface and a size to suit the viewing distance make the biggest difference. Our standard safety sign designs use the high-contrast colour pairs set by the safety sign scheme. Place signs at eye level, well lit and without glare, and keep the wording short. The Please Knock Before Entering Sign is printed on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl.

Can I get a VAT invoice?

No. We are not VAT registered, so we do not charge VAT and cannot issue a VAT invoice. You get an order confirmation email with the items, options and total paid, which works as your receipt. Because no VAT is added, the price you see in the calculator is the price you pay for the goods, with delivery shown at checkout. The Please Knock Before Entering Sign comes in 3 listed sizes, from 200 × 50 mm to 297 × 100 mm.

How many Please Knock Before Entering signs do I need?

Walk the route people take and put a sign wherever someone needs the message and would otherwise miss it: each entrance, each approach to the hazard and each change of direction. Larger areas usually need the same sign more than once, in the size that suits each viewing distance. Add them all as one line with a quantity, or as separate lines if you need different sizes or materials. The Please Knock Before Entering Sign is printed in our Manchester workshop.

Can I reorder the same sign later?

Yes. Order the same product and options again and upload the same file. Keep your print-ready file safe so a repeat order is quick. If anything like a phone number or price has changed, update the artwork before you reorder. The Please Knock Before Entering Sign is printed in our Manchester workshop.

Can someone help me choose the right options for this sign?

Yes. Call us on 0161 315 1151 or message us on WhatsApp and tell us where the sign will go, how long it needs to last and your deadline. You can also ask a question on this page; our team answers and the question may be published to help other buyers. For a price on something the calculator does not cover, use Get a quote. The Please Knock Before Entering Sign is printed in our Manchester workshop.

Can I order several different designs in one order?

Yes. Add each design to the basket as its own line with its own file or online design, then check out once. Delivery is charged once per order, and becomes free when the goods total reaches £99. If several lines use the same artwork, choose "Same artwork as another item in my basket" so you only pay one design fee. The Please Knock Before Entering Sign comes in 3 listed sizes, from 200 × 50 mm to 297 × 100 mm.

What payment methods can I use for the Please Knock Before Entering Sign?

By debit or credit card at checkout. Payments are processed securely by Stripe, and we never see or store your full card number. Your order goes into production once payment is taken and your order and artwork are confirmed. For a large or unusual order you can ask for a quote first. The Please Knock Before Entering Sign comes in 3 listed sizes, from 200 × 50 mm to 297 × 100 mm.

What if my order arrives damaged?

Check it when it arrives. If anything is damaged or missing, tell us within 48 hours with photos of the item and the packaging, through the contact form or on WhatsApp, with your order number. Do not send anything back until we reply; we then arrange a reprint or a refund. This does not affect your legal rights, which the returns page explains. On the opening option, the Please Knock Before Entering Sign is ready to dispatch in 6 working days on Saver or 2 on Express.

How do I clean this sign?

Wipe with a soft cloth and warm, soapy water, then rinse and dry. Do not use solvents, scouring pads or strong cleaners, which can dull or lift the print. Store spare boards flat so they do not bow. The Please Knock Before Entering Sign is printed on 3mm Foamex, 3mm Dibond aluminium composite and self-adhesive vinyl.

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