The Hidden Test That Reveals If Your Agent Can Really Sell Your Home

The Hidden Test That Reveals If Your Agent Can Really Sell Your Home

Not all agents deliver what they promise – but there’s a little-known way to spot the difference before you sign. Try this simple trick (and a few insider checks) to uncover who will genuinely fight for your sale and who’s just talking a good game.

Step One: The Valuation – First Impressions Count

That first face-to-face valuation is your chance to size an agent up. Yes, the suggested price matters, but listen to how they talk about your property. One of the most important questions at this point is “Who will actually be selling my home?” In our case, the answer is simple – our third branch in Dulwich and Herne Hill is Director-led and myself and Rob personally present the open days and work with you right up to completion day.

A good valuation should feel like a conversation, not a sales pitch. You should walk away feeling informed, confident, and supported – not pressured.

Step Two: Quality over Quantity

Some agencies take on as many listings as possible, believing this gives them more buyers to work with. Others, like boutique agencies, prefer to limit the number of properties they represent so they can provide a more tailored service, focused marketing, and dedicated attention. This kind of approach often means high-quality, carefully planned marketing that’s more likely to attract the best motivated buyers, while also reaching additional buyers through diverse, tailored campaigns. Ultimately, it comes down to what you’d prefer as a seller — a broader, numbers-driven model, or a more bespoke approach where your property gets the spotlight.

Step Three: The Mystery Shop Test

Here’s where it gets fun. Call the agent about one of their current listings – ideally something similar to your own home – and pretend to be a potential buyer. You’ll learn more in a five-minute phone call than in any glossy brochure.

Here’s what to listen for:

  • Local Knowledge: Do they genuinely know the area, or are they just reeling off what’s on Google Maps?

  • Property Details: Can they talk about the home with enthusiasm and detail, or does it sound like they’re reading a script?

  • Confidence and Care: Are they warm, helpful, and knowledgeable – the kind of person you’d trust to represent your homw?

  • Viewings: Who shows the property – a dedicated viewing agent, or the person on the phone? This tells you a lot about their structure and level of personal service.

This little “secret shopper” moment is incredibly revealing. If they can’t sell another property with passion, will they really go the extra mile for yours?

Step Four: Marketing – Does Your Home Shine?

In today’s world, first impressions happen online. Browse their current listings and ask yourself:

  • Are the photos professional and inviting? Dark, grainy pictures are an instant red flag.

  • Do they use presenter-led video tours? A great video isn’t just about showing rooms – it should paint a picture of the lifestyle, schools, transport, and community.

  • Is it easy to book a viewing? A smooth, quick system shows efficiency and respect for buyers’ time.

Step Five: Aftercare – The True Test of Service

Lots of agents can talk a good game at the start, but what about once your home is on the market? Do they keep in touch? Share honest feedback? Offer proactive advice?

At GLP, we’re passionate about making sure you’re never left in the dark – from viewings to negotiations, right through to completion. For us, it’s not just about finding a buyer, it’s about making the whole journey smoother and more honest, which ultimately leads to less stress.

The Bottom Line

Choosing an estate agent isn’t just about who gives you the highest valuation – it’s about trust, care, and service. By combining that first face-to-face valuation with the mystery shop test, you’ll quickly see who’s genuinely invested in selling your home, and who’s just going through the motions.

And if you’d like to see how we measure up, we’d love to invite you to put us to the test.

Warm Regards, Kate and Rob Hill

Greater London Properties
Founders of GLP & The Support Our Schools Initiative

PS – Click here to view our latest Video-Hosted Property Tour for you to enjoy. It’s a great way to see how we showcase homes and bring a home to life.


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