diff --git a/docs/changelog.txt b/docs/changelog.txt
index 4a32c9b57..e4588e328 100644
--- a/docs/changelog.txt
+++ b/docs/changelog.txt
@@ -36,12 +36,13 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 ## New Plugins
 
 ## Fixes
--@ `buildingplan`: remember choice per building type for whether the player wants to choose specific items
 -@ `buildingplan`: items are now attached correctly to screw pumps and other multi-item buildings
--@ `buildingplan`: you can now attach multiple weapons to spike traps
 
 ## Misc Improvements
 -@ `buildingplan`: can now filter by clay materials
+-@ `buildingplan`: remember choice per building type for whether the player wants to choose specific items
+-@ `buildingplan`: you can now attach multiple weapons to spike traps
+-@ `buildingplan`: can now filter by whether a slab is engraved
 - `blueprint`: now writes blueprints to the ``dfhack-config/blueprints`` directory
 - `blueprint-library-guide`: library blueprints have moved from ``blueprints`` to ``hack/data/blueprints``
 - player-created blueprints should now go in the ``dfhack-config/blueprints`` folder. please move your existing blueprints from ``blueprints`` to ``dfhack-config/blueprints``. you don't need to move the library blueprints -- those can be safely deleted from the old ``blueprints`` directory.
diff --git a/plugins/buildingplan/buildingplan.cpp b/plugins/buildingplan/buildingplan.cpp
index 304b7001e..c2b4431d9 100644
--- a/plugins/buildingplan/buildingplan.cpp
+++ b/plugins/buildingplan/buildingplan.cpp
@@ -394,7 +394,7 @@ static string getBucket(const df::job_item & ji, const PlannedBuilding & pb, int
         ser << "Hc";
 
     size_t num_materials = item_filter.getMaterials().size();
-    if (num_materials == 0 || num_materials >= 9 || item_filter.getMaterialMask().whole)
+    if (num_materials == 0 || num_materials >= 9 || !item_filter.getMaterialMask().whole)
         ser << "M9";
     else
         ser << "M" << num_materials;
@@ -412,6 +412,9 @@ static string getBucket(const df::job_item & ji, const PlannedBuilding & pb, int
 
     ser << ':' << item_filter.serialize();
 
+    for (auto &special : pb.specials)
+        ser << ':' << special;
+
     return ser.str();
 }
 
@@ -596,7 +599,7 @@ static bool addPlannedBuilding(color_ostream &out, df::building *bld) {
                                     bld->getCustomType()))
         return false;
     BuildingTypeKey key(bld->getType(), bld->getSubtype(), bld->getCustomType());
-    PlannedBuilding pb(out, bld, get_heat_safety_filter(key), get_item_filters(out, key).getItemFilters());
+    PlannedBuilding pb(out, bld, get_heat_safety_filter(key), get_item_filters(out, key));
     return registerPlannedBuilding(out, pb);
 }
 
@@ -621,7 +624,9 @@ static int scanAvailableItems(color_ostream &out, df::building_type type, int16_
     auto &job_items = get_job_items(out, key);
     if (index < 0 || job_items.size() <= (size_t)index)
         return 0;
-    auto &item_filters = get_item_filters(out, key).getItemFilters();
+    auto &item_filters = get_item_filters(out, key);
+    auto &filters = item_filters.getItemFilters();
+    auto &specials = item_filters.getSpecials();
 
     auto &jitem = job_items[index];
     auto vector_ids = getVectorIds(out, jitem);
@@ -630,13 +635,13 @@ static int scanAvailableItems(color_ostream &out, df::building_type type, int16_
     for (auto vector_id : vector_ids) {
         auto other_id = ENUM_ATTR(job_item_vector_id, other, vector_id);
         for (auto &item : df::global::world->items.other[other_id]) {
-            ItemFilter filter = item_filters[index];
+            ItemFilter filter = filters[index];
             if (counts) {
                 // don't filter by material; we want counts for all materials
                 filter.setMaterialMask(0);
                 filter.setMaterials(set<MaterialInfo>());
             }
-            if (itemPassesScreen(item) && matchesFilters(item, jitem, heat, filter)) {
+            if (itemPassesScreen(item) && matchesFilters(item, jitem, heat, filter, specials)) {
                 if (item_ids)
                     item_ids->emplace_back(item->id);
                 if (counts) {
@@ -939,6 +944,29 @@ static int getHeatSafetyFilter(lua_State *L) {
     return 1;
 }
 
+static void setSpecial(color_ostream &out, df::building_type type, int16_t subtype, int32_t custom, string special, bool val) {
+    DEBUG(status,out).print("entering setSpecial\n");
+    BuildingTypeKey key(type, subtype, custom);
+    auto &filters = get_item_filters(out, key);
+    filters.setSpecial(special, val);
+    call_buildingplan_lua(&out, "signal_reset");
+}
+
+static int getSpecials(lua_State *L) {
+    color_ostream *out = Lua::GetOutput(L);
+    if (!out)
+        out = &Core::getInstance().getConsole();
+    df::building_type type = (df::building_type)luaL_checkint(L, 1);
+    int16_t subtype = luaL_checkint(L, 2);
+    int32_t custom = luaL_checkint(L, 3);
+    DEBUG(status,*out).print(
+            "entering getSpecials building_type=%d subtype=%d custom=%d\n",
+            type, subtype, custom);
+    BuildingTypeKey key(type, subtype, custom);
+    Lua::Push(L, get_item_filters(*out, key).getSpecials());
+    return 1;
+}
+
 static void setQualityFilter(color_ostream &out, df::building_type type, int16_t subtype, int32_t custom, int index,
         int decorated, int min_quality, int max_quality) {
     DEBUG(status,out).print("entering setQualityFilter\n");
@@ -1086,6 +1114,7 @@ DFHACK_PLUGIN_LUA_FUNCTIONS {
     DFHACK_LUA_FUNCTION(clearFilter),
     DFHACK_LUA_FUNCTION(setChooseItems),
     DFHACK_LUA_FUNCTION(setHeatSafetyFilter),
+    DFHACK_LUA_FUNCTION(setSpecial),
     DFHACK_LUA_FUNCTION(setQualityFilter),
     DFHACK_LUA_FUNCTION(getDescString),
     DFHACK_LUA_FUNCTION(getQueuePosition),
@@ -1102,6 +1131,7 @@ DFHACK_PLUGIN_LUA_COMMANDS {
     DFHACK_LUA_COMMAND(getMaterialFilter),
     DFHACK_LUA_COMMAND(getChooseItems),
     DFHACK_LUA_COMMAND(getHeatSafetyFilter),
+    DFHACK_LUA_COMMAND(getSpecials),
     DFHACK_LUA_COMMAND(getQualityFilter),
     DFHACK_LUA_END
 };
diff --git a/plugins/buildingplan/buildingplan.h b/plugins/buildingplan/buildingplan.h
index 6aa5e544f..495602b0b 100644
--- a/plugins/buildingplan/buildingplan.h
+++ b/plugins/buildingplan/buildingplan.h
@@ -9,6 +9,7 @@
 #include "df/job_item_vector_id.h"
 
 #include <deque>
+#include <set>
 
 typedef std::deque<std::pair<int32_t, int>> Bucket;
 typedef std::map<df::job_item_vector_id, std::map<std::string, Bucket>> Tasks;
@@ -49,6 +50,6 @@ void set_config_bool(DFHack::PersistentDataItem &c, int index, bool value);
 std::vector<df::job_item_vector_id> getVectorIds(DFHack::color_ostream &out, const df::job_item *job_item);
 bool itemPassesScreen(df::item * item);
 df::job_item getJobItemWithHeatSafety(const df::job_item *job_item, HeatSafety heat);
-bool matchesFilters(df::item * item, const df::job_item * job_item, HeatSafety heat, const ItemFilter &item_filter);
+bool matchesFilters(df::item * item, const df::job_item * job_item, HeatSafety heat, const ItemFilter &item_filter, const std::set<std::string> &special);
 bool isJobReady(DFHack::color_ostream &out, const std::vector<df::job_item *> &jitems);
 void finalizeBuilding(DFHack::color_ostream &out, df::building *bld);
diff --git a/plugins/buildingplan/buildingplan_cycle.cpp b/plugins/buildingplan/buildingplan_cycle.cpp
index 41825c7da..803f1f130 100644
--- a/plugins/buildingplan/buildingplan_cycle.cpp
+++ b/plugins/buildingplan/buildingplan_cycle.cpp
@@ -10,6 +10,7 @@
 
 #include "df/building_design.h"
 #include "df/item.h"
+#include "df/item_slabst.h"
 #include "df/job.h"
 #include "df/map_block.h"
 #include "df/world.h"
@@ -58,7 +59,7 @@ df::job_item getJobItemWithHeatSafety(const df::job_item *job_item, HeatSafety h
     return jitem;
 }
 
-bool matchesFilters(df::item * item, const df::job_item * job_item, HeatSafety heat, const ItemFilter &item_filter) {
+bool matchesFilters(df::item * item, const df::job_item * job_item, HeatSafety heat, const ItemFilter &item_filter, const std::set<string> &specials) {
     // check the properties that are not checked by Job::isSuitableItem()
     if (job_item->item_type > -1 && job_item->item_type != item->getType())
         return false;
@@ -77,6 +78,10 @@ bool matchesFilters(df::item * item, const df::job_item * job_item, HeatSafety h
         && !item->hasToolUse(job_item->has_tool_use))
         return false;
 
+    if (item->getType() == df::item_type::SLAB && specials.count("engraved")
+        && static_cast<df::item_slabst *>(item)->engraving_type != df::slab_engraving_type::Memorial)
+        return false;
+
     df::job_item jitem = getJobItemWithHeatSafety(job_item, heat);
 
     return Job::isSuitableItem(
@@ -212,7 +217,7 @@ static void doVector(color_ostream &out, df::job_item_vector_id vector_id,
             auto &pb = planned_buildings.at(id);
             if (isAccessibleFrom(out, item, job)
                     && matchesFilters(item, jitems[filter_idx], pb.heat_safety,
-                        pb.item_filters[rev_filter_idx])
+                        pb.item_filters[rev_filter_idx], pb.specials)
                     && Job::attachJobItem(job, item,
                         df::job_item_ref::Hauled, filter_idx))
             {
diff --git a/plugins/buildingplan/defaultitemfilters.cpp b/plugins/buildingplan/defaultitemfilters.cpp
index e866808f8..8af74eff2 100644
--- a/plugins/buildingplan/defaultitemfilters.cpp
+++ b/plugins/buildingplan/defaultitemfilters.cpp
@@ -31,6 +31,13 @@ static int get_max_quality(const df::job_item *jitem) {
     return df::item_quality::Masterful;
 }
 
+static string serialize(const std::vector<ItemFilter> &item_filters, const std::set<std::string> &specials) {
+    std::ostringstream out;
+    out << serialize_item_filters(item_filters);
+    out << "|" << join_strings(",", specials);
+    return out.str();
+}
+
 DefaultItemFilters::DefaultItemFilters(color_ostream &out, BuildingTypeKey key, const std::vector<const df::job_item *> &jitems)
         : key(key), choose_items(false) {
     DEBUG(status,out).print("creating persistent data for filter key %d,%d,%d\n",
@@ -44,22 +51,30 @@ DefaultItemFilters::DefaultItemFilters(color_ostream &out, BuildingTypeKey key,
     for (size_t idx = 0; idx < jitems.size(); ++idx) {
         item_filters[idx].setMaxQuality(get_max_quality(jitems[idx]), true);
     }
-    filter_config.val() = serialize_item_filters(item_filters);
+    filter_config.val() = serialize(item_filters, specials);
 }
 
 DefaultItemFilters::DefaultItemFilters(color_ostream &out, PersistentDataItem &filter_config, const std::vector<const df::job_item *> &jitems)
         : key(getKey(filter_config)), filter_config(filter_config) {
     choose_items = get_config_bool(filter_config, FILTER_CONFIG_CHOOSE_ITEMS);
     auto &serialized = filter_config.val();
-    DEBUG(status,out).print("deserializing item filters for key %d,%d,%d: %s\n",
+    DEBUG(status,out).print("deserializing default item filters for key %d,%d,%d: %s\n",
         std::get<0>(key), std::get<1>(key), std::get<2>(key), serialized.c_str());
-    std::vector<ItemFilter> filters = deserialize_item_filters(out, serialized);
+    std::vector<std::string> elems;
+    split_string(&elems, serialized, "|");
+    std::vector<ItemFilter> filters = deserialize_item_filters(out, elems[0]);
     if (filters.size() != jitems.size()) {
         WARN(status,out).print("ignoring invalid filters_str for key %d,%d,%d: '%s'\n",
             std::get<0>(key), std::get<1>(key), std::get<2>(key), serialized.c_str());
         item_filters.resize(jitems.size());
     } else
         item_filters = filters;
+    if (elems.size() > 1) {
+        vector<string> specs;
+        split_string(&specs, elems[1], ",");
+        for (auto & special : specs)
+            specials.emplace(special);
+    }
 }
 
 void DefaultItemFilters::setChooseItems(bool choose) {
@@ -67,6 +82,14 @@ void DefaultItemFilters::setChooseItems(bool choose) {
     set_config_bool(filter_config, FILTER_CONFIG_CHOOSE_ITEMS, choose);
 }
 
+void DefaultItemFilters::setSpecial(const std::string &special, bool val) {
+    if (val)
+        specials.emplace(special);
+    else
+        specials.erase(special);
+    filter_config.val() = serialize(item_filters, specials);
+}
+
 void DefaultItemFilters::setItemFilter(DFHack::color_ostream &out, const ItemFilter &filter, int index) {
     if (index < 0 || item_filters.size() <= (size_t)index) {
         WARN(status,out).print("invalid index for filter key %d,%d,%d: %d\n",
@@ -75,7 +98,7 @@ void DefaultItemFilters::setItemFilter(DFHack::color_ostream &out, const ItemFil
     }
 
     item_filters[index] = filter;
-    filter_config.val() = serialize_item_filters(item_filters);
+    filter_config.val() = serialize(item_filters, specials);
     DEBUG(status,out).print("updated item filter and persisted for key %d,%d,%d: %s\n",
         std::get<0>(key), std::get<1>(key), std::get<2>(key), filter_config.val().c_str());
 }
diff --git a/plugins/buildingplan/defaultitemfilters.h b/plugins/buildingplan/defaultitemfilters.h
index 37ebdcaae..d7ed12a7b 100644
--- a/plugins/buildingplan/defaultitemfilters.h
+++ b/plugins/buildingplan/defaultitemfilters.h
@@ -16,12 +16,15 @@ public:
 
     void setChooseItems(bool choose);
     void setItemFilter(DFHack::color_ostream &out, const ItemFilter &filter, int index);
+    void setSpecial(const std::string &special, bool val);
 
     bool getChooseItems() const { return choose_items; }
     const std::vector<ItemFilter> & getItemFilters() const { return item_filters; }
+    const std::set<std::string> & getSpecials() const { return specials; }
 
 private:
     DFHack::PersistentDataItem filter_config;
     bool choose_items;
     std::vector<ItemFilter> item_filters;
+    std::set<std::string> specials;
 };
diff --git a/plugins/buildingplan/plannedbuilding.cpp b/plugins/buildingplan/plannedbuilding.cpp
index aef55edc3..60e99e073 100644
--- a/plugins/buildingplan/plannedbuilding.cpp
+++ b/plugins/buildingplan/plannedbuilding.cpp
@@ -69,19 +69,35 @@ static vector<ItemFilter> get_item_filters(color_ostream &out, PersistentDataIte
     return deserialize_item_filters(out, rawstrs[1]);
 }
 
-static string serialize(const vector<vector<df::job_item_vector_id>> &vector_ids, const vector<ItemFilter> &item_filters) {
+static set<string> get_specials(color_ostream &out, PersistentDataItem &bld_config) {
+    vector<string> rawstrs;
+    split_string(&rawstrs, bld_config.val(), "|");
+    set<string> ret;
+    if (rawstrs.size() < 3)
+        return ret;
+    vector<string> specials;
+    split_string(&specials, rawstrs[2], ",");
+    for (auto & special : specials)
+        ret.emplace(special);
+    return ret;
+}
+
+static string serialize(const vector<vector<df::job_item_vector_id>> &vector_ids, const DefaultItemFilters &item_filters) {
     vector<string> joined;
     for (auto &vec_list : vector_ids) {
         joined.emplace_back(join_strings(",", vec_list));
     }
     std::ostringstream out;
-    out << join_strings(";", joined) << "|" << serialize_item_filters(item_filters);
+    out << join_strings(";", joined);
+    out << "|" << serialize_item_filters(item_filters.getItemFilters());
+    out << "|" << join_strings(",", item_filters.getSpecials());
     return out.str();
 }
 
-PlannedBuilding::PlannedBuilding(color_ostream &out, df::building *bld, HeatSafety heat, const vector<ItemFilter> &item_filters)
+PlannedBuilding::PlannedBuilding(color_ostream &out, df::building *bld, HeatSafety heat, const DefaultItemFilters &item_filters)
         : id(bld->id), vector_ids(get_vector_ids(out, id)), heat_safety(heat),
-          item_filters(item_filters) {
+          item_filters(item_filters.getItemFilters()),
+          specials(item_filters.getSpecials()) {
     DEBUG(status,out).print("creating persistent data for building %d\n", id);
     bld_config = World::AddPersistentData(BLD_CONFIG_KEY);
     set_config_val(bld_config, BLD_CONFIG_ID, id);
@@ -95,6 +111,7 @@ PlannedBuilding::PlannedBuilding(color_ostream &out, PersistentDataItem &bld_con
         vector_ids(deserialize_vector_ids(out, bld_config)),
         heat_safety((HeatSafety)get_config_val(bld_config, BLD_CONFIG_HEAT)),
         item_filters(get_item_filters(out, bld_config)),
+        specials(get_specials(out, bld_config)),
         bld_config(bld_config) { }
 
 // Ensure the building still exists and is in a valid state. It can disappear
diff --git a/plugins/buildingplan/plannedbuilding.h b/plugins/buildingplan/plannedbuilding.h
index 59dc24a79..703d4246d 100644
--- a/plugins/buildingplan/plannedbuilding.h
+++ b/plugins/buildingplan/plannedbuilding.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "buildingplan.h"
+#include "defaultitemfilters.h"
 #include "itemfilter.h"
 
 #include "Core.h"
@@ -21,7 +22,9 @@ public:
 
     const std::vector<ItemFilter> item_filters;
 
-    PlannedBuilding(DFHack::color_ostream &out, df::building *bld, HeatSafety heat, const std::vector<ItemFilter> &item_filters);
+    const std::set<std::string> specials;
+
+    PlannedBuilding(DFHack::color_ostream &out, df::building *bld, HeatSafety heat, const DefaultItemFilters &item_filters);
     PlannedBuilding(DFHack::color_ostream &out, DFHack::PersistentDataItem &bld_config);
 
     void remove(DFHack::color_ostream &out);
diff --git a/plugins/lua/buildingplan/filterselection.lua b/plugins/lua/buildingplan/filterselection.lua
index e923c4b5b..84b5c46ea 100644
--- a/plugins/lua/buildingplan/filterselection.lua
+++ b/plugins/lua/buildingplan/filterselection.lua
@@ -432,6 +432,15 @@ function QualityAndMaterialsPage:refresh()
     else summary = 'Any ' .. summary
     end
 
+    local specials = buildingplan.getSpecials(uibs.building_type, uibs.building_subtype, uibs.custom_type)
+    if next(specials) then
+        local specials_list = {}
+        for special in pairs(specials) do
+            table.insert(specials_list, special)
+        end
+        summary = summary .. ' [' .. table.concat(specials_list, ', ') .. ']'
+    end
+
     local quality = buildingplan.getQualityFilter(uibs.building_type, uibs.building_subtype, uibs.custom_type, self.index-1)
     subviews.decorated:setOption(quality.decorated ~= 0)
     subviews.min_quality:setOption(quality.min_quality)
diff --git a/plugins/lua/buildingplan/planneroverlay.lua b/plugins/lua/buildingplan/planneroverlay.lua
index d4a94a01d..df49fe287 100644
--- a/plugins/lua/buildingplan/planneroverlay.lua
+++ b/plugins/lua/buildingplan/planneroverlay.lua
@@ -81,14 +81,18 @@ local function cur_building_has_no_area()
     return filters and filters[1] and (not filters[1].quantity or filters[1].quantity > 0)
 end
 
+local function is_construction()
+    return uibs.building_type == df.building_type.Construction
+end
+
 local function is_plannable()
     return get_cur_filters() and
-            not (uibs.building_type == df.building_type.Construction
-                 and uibs.building_subtype == df.construction_type.TrackNSEW)
+            not (is_construction() and
+                uibs.building_subtype == df.construction_type.TrackNSEW)
 end
 
-local function is_construction()
-    return uibs.building_type == df.building_type.Construction
+local function is_slab()
+    return uibs.building_type == df.building_type.Slab
 end
 
 local function is_stairs()
@@ -346,6 +350,16 @@ function PlannerOverlay:init()
             options={1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
             on_change=function(val) weapon_quantity = val end,
         },
+        widgets.ToggleHotkeyLabel {
+            view_id='engraved',
+            frame={t=5, l=4},
+            key='CUSTOM_T',
+            label='Engraved only:',
+            visible=is_slab,
+            on_change=function(val)
+                buildingplan.setSpecial(uibs.building_type, uibs.building_subtype, uibs.custom_type, 'engraved', val)
+            end,
+        },
         widgets.Label{
             frame={b=3, l=17},
             text={
@@ -637,10 +651,13 @@ function PlannerOverlay:onRenderFrame(dc, rect)
 
     if reset_counts_flag then
         self:reset()
-        self.subviews.choose:setOption(require('plugins.buildingplan').getChooseItems(
+        local buildingplan = require('plugins.buildingplan')
+        self.subviews.engraved:setOption(buildingplan.getSpecials(
+            uibs.building_type, uibs.building_subtype, uibs.custom_type).engraved or false)
+        self.subviews.choose:setOption(buildingplan.getChooseItems(
+            uibs.building_type, uibs.building_subtype, uibs.custom_type))
+        self.subviews.safety:setOption(buildingplan.getHeatSafetyFilter(
             uibs.building_type, uibs.building_subtype, uibs.custom_type))
-        self.subviews.safety:setOption(require('plugins.buildingplan').getHeatSafetyFilter(
-                uibs.building_type, uibs.building_subtype, uibs.custom_type))
     end
 
     local selection_pos = self.saved_selection_pos or uibs.selection_pos