Roof types explained the way I use them on real Sussex homes

When customers ask me about different roof types, they usually get hit with pages of generic diagrams online: gable, hip, mansard, flat, and so on. That is fine for a textbook, but it is almost useless when you are standing in your back garden in Hove trying to decide what to do with your extension, loft conversion or tired old garage roof.

In my 18 years on the roof around Brighton, Hove and Worthing, I have learned that the more important question is not “what types of roof exist?”, but “which roof type actually makes sense for your house, your budget and the way you live?”

This page is my honest, practical guide to roof types from that angle: how I really use them on local properties, what tends to go wrong, and how I help you choose without the sales talk.

The big split: flat roofs vs pitched roofs in real life

Most Sussex homes use a mix of roof types, not just one. A typical street in Brighton will have:

  • A main pitched roof on the house
  • Flat roofs on the rear extension, bay window or dormer
  • Maybe a small porch or balcony roof in a different material again

So instead of listing every shape in the dictionary, I look at roofs in two main families:

  • Pitched roof types – your main house roof, some porches, traditional bays
  • Flat roof types – extensions, garages, dormers, bay tops, balconies, porches

Here is how I break them down when I am on site with you.

Pitched roof types I typically work with

If you ask me, I will tell you straight: most pitched roofs in Brighton and Hove are not “architectural statements”, they are simple, functional shapes that either keep water out or they do not. The shape itself matters far less than the detailing, the ventilation and the condition of the timbers.

1. Simple gable roofs (the classic terrace or semi)

This is the most common pitched roof type on terraced and semi-detached homes – two sloping sides meeting in a ridge, with a gable wall at each end. You see them all over Brighton and Worthing.

On these roofs, the shape is straightforward. The real questions are:

  • Are the tiles or slates near the end of their life?
  • Is the underlay (felt or breathable membrane) perished or torn?
  • Are the battens rotten or undersized?
  • Is the ridge properly bedded or has the mortar cracked out?

When I am dealing with a tired gable roof on a terraced house, I often end up recommending a full strip and re-tile or re-slate. If you are in that situation, you can read more about how I approach that here: https://jan-roofer.com/service/brighton-terraced-house-pitched-roof/.

2. Hipped roofs and why they cost more to work on

A hipped roof slopes down on all four sides instead of having a flat gable wall. You see these on some 1930s and 1950s properties around Hove and Patcham.

From your point of view as a homeowner, the main differences are:

  • More edges and hip lines = more labour when the roof is replaced
  • More junctions where leaks can start if they are not detailed correctly
  • Scaffolding is usually a bit more involved

The roof type itself does not make the house better or worse – it just affects how long a replacement takes and how much care I have to put into the hip details, ridge ventilation and underlay overlaps.

3. Pitched dormers punched into the main roof

Loft conversions often introduce dormer roof types – sometimes flat, sometimes pitched. A small pitched dormer has its own tiny gable and two sloping sides, intersecting with the main roof.

The weak points here are rarely the tiles themselves. It is the junctions:

  • Side flashings where the dormer meets the main roof
  • Leadwork or soakers around dormer cheeks
  • The change from pitched to flat on the top if it is a hybrid design

If the top of your dormer is flat or nearly flat and starting to puddle or crack, that is where I often recommend a proper modern flat roof system. I specialise in that sort of work – more about how I cost flat dormer roofs here: https://jan-roofer.com/service/flat-roof-dormer/.

4. Pitched bays and decorative frontages

On some older Brighton houses, the front bay has a small pitched roof with tiles or slates that match the main roof. On others, it is a flat roof hidden behind a decorative fascia.

This is a classic area where the type of roof you choose changes the look of the house. If you want to keep a traditional appearance, I usually stay with tiles or slates. If you are more worried about ongoing maintenance and hidden leaks, a clean, well-detailed flat bay top with proper drip edges can be the better call.

For flat bay tops I have a dedicated service page here: https://jan-roofer.com/service/hove-brighton-cost-bay-window-roof-flat-roof/.

Flat roof types I see every week in Sussex

Flat roofs are where the conversation about roof types actually gets practical, because there are so many materials and build-ups you can use for the same shape.

Most people simply say “I have a flat roof” – but from my side, the real decision is between different flat roof systems and the details around them, not just the visual finish.

1. Extension roofs: warm, cold and everything in between

Rear extensions are one of the most common places I get called out to. Many of them were built years ago as simple cold roofs with a bit of basic felt on top and almost no thought given to insulation or ventilation.

When I assess an extension roof, I am usually deciding between:

  • A modern warm roof – insulation above the deck, fewer condensation issues, better energy performance, slightly higher build-up
  • A cold roof upgrade – keeping the structure similar but sorting out the waterproofing, outlets and edge details properly

If you are planning a rear extension or replacing a failing one, you might find this useful: https://jan-roofer.com/service/rear-extension-roof/.

2. Garage roofs – simple shape, big decisions

Garages are usually a very simple flat or nearly-flat roof type, often built cheaply at the time and then forgotten about. The trouble is, once water gets into a garage roof, it often rots the timbers before anyone notices.

With garages, I look at:

  • Has the deck started to sag or go spongy underfoot?
  • Is there any point trying to patch the old surface, or is it false economy?
  • Do you want basic weather protection or something smarter that ties in with the house?

To keep things straightforward, I have an instant cost calculator for garage roof replacements and repairs: https://jan-roofer.com/service/garage-flat-roof-cost-brighton-hove-worthing/.

3. Porch and canopy roofs

Porch roofs come in all sorts of types: small pitched tiled roofs, flat felt roofs, lightweight sheets and sometimes questionable DIY fixes.

My honest advice is this: a porch roof still needs to be detailed like a “proper” roof. It might look small and simple, but if the flashing against the wall is wrong or the fall is too shallow, water will find its way into your house wall or door frame.

If you want to see realistic budgets for porch flat roofs locally, I have broken that down here: https://jan-roofer.com/service/hove-brighton-cost-porch-flat-roof/.

4. Bay window tops – small area, high risk

Bay window flat roofs are probably one of the most common leak points I get called about in Brighton. They are often tiny, awkward and hidden under decorative trims – which means they are easy to bodge and hard for you to see from the ground.

The roof type here is almost always a small flat roof, but the real question is:

  • Is it correctly sealed into the wall?
  • Does it have a proper drip edge so water cannot run back into the masonry?
  • Has the material reached the end of its life?

If you are already seeing stains above your bay window, I would strongly suggest getting it checked. You can see how I price and approach this type of work here: https://jan-roofer.com/service/hove-brighton-cost-bay-window-roof-flat-roof/.

5. Balcony and roof terrace roofs

Once you put people, furniture or decking on top of a flat roof, that roof type changes completely. It is no longer just a waterproof lid – it has to handle foot traffic, trapped moisture under decking, railings bolted through it, and sometimes complex falls towards hidden outlets.

Balcony and terrace roofs are one of those jobs where I treat the detailing as more critical than the square metres. If the falls, outlets and penetrations are wrong, no fancy surface covering will save it.

If you are thinking about turning a flat roof into a usable terrace, or your existing balcony is leaking into the room below, you can read more about my approach here: https://jan-roofer.com/service/hove-brighton-cost-balcony-roof-terrace/.

6. Dormer tops – the flat part nobody sees

Many loft conversions in Sussex have a combination roof type: pitched sides that you can see from the street, and a flat top on the dormer that you cannot see from anywhere.

That flat top is often where the problems start, especially after 10–15 years of coastal weather. If it fails, you end up with damp ceilings in your expensive new loft rooms.

I specialise in renewing these hidden flat tops properly, with attention to outlets, falls and the junction into the pitched roof. Full details and instant cost guidance here: https://jan-roofer.com/service/flat-roof-dormer/.

How I actually choose between roof types on a job

People often expect a fancy answer here, but in reality I go through the same practical checklist on every property. The “right” roof type for you is usually the one that scores best across these questions:

1. What is the building really used for?

  • Main living space or bedroom? I lean towards warmer, better insulated systems, even if they cost a bit more up front.
  • Garage or outbuilding? A solid, no-nonsense waterproofing layer that will not need constant attention is usually the focus.
  • Balcony or terrace? Then I am thinking about wear, barriers, and how to get water out from under any decking systems.

2. How long do you plan to stay in the house?

If you tell me you plan to move in a year, my advice on roof types will be different than if this is your long-term home. I can suggest sensible repair or overlay options when that is all that is needed, or a full renewal when the current system has no safe future in it.

3. What is your budget really?

I do not believe in pretending that all roof types cost the same. Some systems are simply more labour intensive or use pricier materials. That is one reason I built instant calculators for my main services – you can see realistic figures without any pressure.

4. What is already there – and is it safe to build on?

Sometimes the best roof type is the one that works with what you already have. Other times, trying to “save” an old deck or rotten timbers will only store up bigger problems.

On pitched roofs, this might mean assessing whether it is viable to just replace the tiles and underlay, or whether the battens and some rafters need attention too. I cover that in more detail here: https://jan-roofer.com/service/roof-batten-and-felt-replacement-cost/.

Overlooked parts of the roof that matter as much as the type

Homeowners quite understandably focus on the main roof surface: tiles, slates, or the flat roof covering. In my day-to-day work though, many leaks and failures come from the supporting parts of the roof system. These are important whatever roof type you choose.

1. Fascias, soffits and ventilation

The fascias and soffits at the edge of the roof might look like simple trims, but they have three big jobs:

  • Supporting the guttering so water can be collected and taken away
  • Protecting the ends of the rafters from weather and pests
  • Providing ventilation into the roof space on many pitched roofs

If you have tired or rotten timber fascias, or you are thinking about upgrading to low-maintenance uPVC, you can see how I handle that here: https://jan-roofer.com/service/upvc-fascia-board-replacement-cost-brighton-sussex/.

2. Guttering and downpipes

No matter which roof type you have, the water still needs somewhere to go. Undersized or poorly sloped gutters cause overflows, staining and even damp in the walls.

On flat roofs especially, a blocked or badly placed outlet can turn the whole surface into a shallow pond. In my experience along the Sussex coast, sorting out the guttering and downpipes is one of the cheapest ways to protect a roof of any type.

If your gutters are constantly overflowing or looking past their best, this is the service page I direct customers to: https://jan-roofer.com/service/brighton-guttering-downpipe-installation/.

3. Lead flashings and junctions

Roofs do not leak through the middle when they are installed properly – they leak where they meet walls, chimneys and other roof sections. That is where lead flashings, soakers and cappings do the heavy lifting.

On almost every roof type I work on, I end up inspecting the leadwork as carefully as the main covering. Split, undersized or badly chased lead is responsible for more “mystery” damp patches than most people realise.

If you already suspect your leadwork or chimney flashings might be the issue, you can see how I approach those jobs here: https://jan-roofer.com/service/cost-brighton-worthing-lead-flashing/.

4. Parapet walls and firewall caps

On some terraces and flat-roofed properties, parapet walls and firewalls run up above the roof line. If the top of these walls is not properly capped and waterproofed, they suck in water and feed damp into the adjoining rooms, whatever roof type you have.

On flat roofs in particular, I often recommend proper felt or lead cappings to keep these walls dry and protect the inner structure. You can read more about that here: https://jan-roofer.com/service/firewall-parapet-felt-capping/.

Practical steps if you are not sure which roof type you have

You do not need the perfect technical name for your roof before you ask me to look at it. When customers phone me, they often say things like “the flat bit at the back is leaking” or “my bay window roof looks rough”. That is more than enough to get started.

Here is the simple process I suggest:

  1. Take a few clear photos from the pavement, garden or upstairs window, including where the roof meets walls or other roofs.
  2. Make a note of any symptoms – stains on ceilings, damp patches, drips during certain types of rain.
  3. Use one of my calculators if your roof area matches one of my common services (garage, extension, porch, bay, dormer, main flat roof). The instant estimates help you see if a full replacement or a repair feels realistic for you.
  4. Book a proper inspection if you want clear answers and a fixed-price quote.

For a free site visit and roof inspection around Brighton and Sussex, you can book me here: https://jan-roofer.com/service/book-a-free-roof-inspection-in-brighton-sussex/.

How I keep roof type decisions transparent: estimates, quotes and the client portal

Choosing between roof types can feel like guesswork when you are not on the roof every day. This is why I set my service up differently to most traditional roofing firms.

1. Instant online estimates – no sales call needed

For the most common roof types I work on, I have built interactive calculators so you can get a realistic, commitment-free estimate online. You do not have to speak to me first if you do not want to – just measure up, put in the basics, and you will see a price range straight away.

These calculators cover things like:

2. Fixed-price quotes after a free site survey

If the estimate looks sensible to you, I come out, inspect the roof properly, and then give you a fixed-price written quote. No vague “day rates”, no hidden extras buried in small print.

At that stage I will usually explain which roof type and build-up I recommend for your specific situation, and what cheaper or more premium options look like if you want to compare.

3. The client portal – full visibility while I am on your roof

Once you book the job, you get access to a secure online portal. From there you can:

  • See your schedule and any weather-related changes
  • View daily photo logs showing exactly what I have done on your roof
  • Download your invoice and any warranties safely in one place

That way, if we have agreed on a specific roof type and specification, you can actually see it being installed – not just hope it matches the quote.

When you should treat a roof type issue as an emergency

Most roof problems can be planned and dealt with sensibly, but there are times when you should not wait:

  • Water actively dripping through lights or electrics
  • Ceilings bowing, sagging or staining rapidly
  • Large sections of tiles/slates blown off in a storm
  • Flat roofs where the deck has gone spongy and feels unsafe

In those situations, getting the right roof type decided can wait – making the building safe and watertight comes first. If you are in that position, you can use my priority leak and emergency booking service here: https://jan-roofer.com/service/brighton-urgent-leak-booking/.

Not sure what roof type you even have? I will work it out.

You do not have to arrive knowing the exact roof type or system name. That is my job. All I need from you is a rough description of the problem and, ideally, a few photos.

If you want straight, no-pressure advice on what makes sense for your particular roof in Brighton, Hove, Worthing or nearby, the best next step is a free inspection and fixed quote:

https://jan-roofer.com/service/book-a-free-roof-inspection-in-brighton-sussex/

From there I will walk you through the roof types that actually apply to your property, what they cost, and which one I would choose if it were my own house.