Why Garage Roof Quotes Vary Wildly in Sussex
If you are looking to repair or replace your garage roof in Sussex, you may have noticed a frustrating reality: quotes from different roofing firms can vary dramatically for what appears to be the same job. One contractor may give a very low price, another may quote much higher, and it is not always obvious what is actually included. The real difference is usually not just labour cost — it is the quality of the preparation, the materials used, and whether the old roof is being properly stripped and inspected.
In the trades, pricing is also affected by workload. If a roofing company is already fully booked, they may quote higher because they do not urgently need the work. If you accept the price, the margin makes it worth fitting into the schedule. If you decline, they have lost nothing. This is common across the industry, but it can make garage roof pricing confusing for property owners who simply want a fair and technically correct quote.
The Technical Side of Outbuilding Roof Failures
Regardless of the quoted price, the technical standard of the repair must be right. Many failing outbuildings still have old pour-and-roll felt or basic mineral felt that has become brittle over time. Once a lap joint opens, a corner lifts, or an edge detail fails, rainwater can be drawn underneath the membrane by capillary action. The leak may only appear as a small damp patch inside the garage, but the timber deck can already be absorbing water.
This is where cheap work becomes risky. If new felt is simply installed over a wet or rotten deck, the roof may look better for a short time, but the trapped moisture remains underneath. A proper replacement means stripping the roof back, checking the timber structure, replacing weak or rotten boards where needed, and creating a stable base before the new felt system is installed.
For long-term durability, I normally use heavy-duty OSB3 structural decking where the existing boards are no longer reliable. Over this, I apply a high-performance SBS-modified bitumen torch-on felt system. The synthetic rubber in SBS bitumen helps the roof expand and contract with temperature changes, making it more flexible than older basic felt systems and less likely to crack or blister prematurely.
Why the Cheapest Quote Is Not Always the Best Quote
A low quote can be perfectly fine if the roof is small, dry, simple, and structurally sound. The problem is when a low price is based on skipping essential preparation. Garage roofs often fail at the edges, joints, corners, and areas where water sits after rain. If these details are not corrected, the same leak can return even after new felt has been added.
The most important part of a garage roof job is diagnosis. Before deciding whether the roof needs a repair, overlay, or full replacement, the deck condition must be considered. A firm roof deck gives the new felt a proper base. A soft or sagging deck means the visible felt is only one part of the problem.
Instantly Benchmark Your Price
The problem with unclear pricing is that property owners can waste weeks collecting quotes without knowing which one reflects the correct scope of work. One price may include stripping and new decking. Another may only include an overlay. On paper, both may look like a garage roof quote, but technically they are very different jobs.
You can use the automated calculator on my website to get a clear starting estimate for a proper, technically sound garage roof replacement. It calculates the expected material and labour costs based on the roof details you provide. Even if you do not book the work, the calculator helps you benchmark other quotes and understand whether the price you have been given is realistic for a proper garage roof replacement in Sussex.