GarageInvestor — Build wealth with the UK's most overlooked asset

Concentration risk, scale economics, and why the answer isn't always more units.

The instinct of most growth-minded investors is to scale: buy a single garage, then a pair, then a block of six, then a row of twelve. More units, more cash flow, more economy of scale. Mostly true. Sometimes wrong in interesting ways.

This is the comparison we would run when deciding between a single £20,000 garage and a £120,000 block of six.

What scale gives you

The genuine economies of scale on a garage block are smaller than on most asset classes, but they are real.

Insurance per unit drops. A standalone garage policy is £80-150/year. Block cover for six garages on a single policy is typically £350-450/year — about 60-70% of the per-unit cost.

Maintenance is more efficient. A roof patch on a block of six costs proportionally less per garage than the same patch on a single. The professional you call out for a door repair will give you a marginally better rate for "while I am here, do these other two".

Letting friction is lower. When one tenant leaves, the others stay. A six-garage block at 7% voids on a smoothed basis behaves like a portfolio with 5.5 reliably-occupied units; a single garage at the same void rate produces lumpy income with months at zero.

Sourcing is more capital-efficient. Buying six garages through one transaction means one set of legal fees, one set of buyer premiums, one round of due diligence. Compared to buying six garages over six separate transactions, that is £4,000-7,000 less in friction costs.

What scale takes from you

The hidden costs of concentration that most investors do not price in.

Single-asset exposure. A block of six garages is, almost always, a single title or single ownership unit on a single piece of land with a single set of access arrangements. Whatever happens to that block — a development plan from the freeholder, a parking change, an estate redevelopment — happens to all six units at once.

Tenure complications. Many garage blocks are leasehold, with the underlying land owned by an estate company or council. Six leases under one freeholder concentrates that risk; six freeholds in different locations diversifies it.

Liquidity is worse, not better. A single £20,000 garage has a buyer pool of small investors and end-users. A £120,000 block has a buyer pool of investors only — and not many of them. When you come to sell, the single garages liquidate faster individually than the block does as a unit.

One bad tenant matters more. With a block, your tenants likely live near each other. A problem tenant behaviour affects the whole block appeal. With distributed singles, a bad tenant in one location does not poison the others.

The financial comparison

Take two scenarios at the same total capital — £120,000 — over a 10-year hold:

Scenario A: Six singles in three different postcodes.

Average gross yield 8%, smoothed across the portfolio after voids and costs.
Acquisition costs: 6× £1,500 = £9,000 in friction.
Ten-year compounded net cash, assuming 3% annual rent growth: roughly £85,000.
Capital appreciation at 3%/year on £120,000: £40,500.
Total return: £125,500. Annualised: 8.0% IRR-equivalent.

Scenario B: One block of six.

Average gross yield 9% — slightly higher because block sourcing typically buys at a small per-unit discount.
Acquisition costs: 1× £3,500 = £3,500.
Ten-year compounded net cash: roughly £92,000 (lower void smoothing offsets some of the yield advantage).
Capital appreciation at 3%/year: £40,500.
Total return: £132,000. Annualised: 8.5% IRR-equivalent.

The block wins on the headline IRR by about 50 basis points. The singles win on diversification — six independent assets versus one — which does not show up in the model but matters in practice.

For most investors, this means: blocks at the start of the portfolio are fine if priced right, but the second and third blocks should be in different locations rather than next to the first. A portfolio of three blocks across three regions is structurally similar to 18 distributed singles, with most of the scale economics and most of the diversification.

When a block is the right answer

You can buy at a clear per-unit discount (10%+) versus the local single-unit market.
The block is freehold or has a long, clean leasehold (90+ years).
The location is established, not a recent development with uncertain demand.
You have time to manage 5-6 tenants in one location, including handling intra-block disputes.

When singles are the right answer

You are early in your portfolio and want to learn across multiple deals.
You have time only to run one or two tenants at a time.
You are concerned about concentration risk.
The blocks available are leasehold from a counterparty you do not trust (council with a short remaining lease, estate company with redevelopment plans).

The portfolio view

The right structure for most growing garage portfolios is mixed: 1-2 blocks plus 4-8 distributed singles, in 3-4 geographies, totalling 12-20 units. That spreads concentration risk while capturing most of the scale economy. It is also a portfolio you can actually manage by yourself.

The Cash Flow Projection tool models both scenarios — run the same capital through "one block of six" and "six singles" to see which produces the cash profile that suits your circumstances.